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QL 737 .C424 H86x



Humpback whales in Glacier

Bay National Monument, Alaska

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Report No. MMC-79/01

HUMPBACK WHALES IN GLACIER BAY NATIONAL MONUMENT, ALASKA

Marine Mammal Commission

1625 I Street, N.W.

Washington, D.C. 20006

Published February 1980

U.S. Marine Mammal Commission

1625 I Street, N.W.

Washington, D.C. 20006

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NOTICE

THIS DOCUMENT HAS BEEN REPRODUCED FROM THE BEST COPY FURNISHED US BY
THE SPONSORING AGENCY. ALTHOUGH IT IS RECOGNIZED THAT CERTAIN PORTIONS
ARE ILLEGIBLE, IT IS BEING RELEASED IN THE INTEREST OF MAKING AVAILABLE
AS MUCH INFORMATION AS POSSIBLE.

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1. Report No. MMC-79/01 2.        3. Recipient's Accession No. PB 80 141559 4. Title and Subtitle Humpback Whales in Glacier Bay National Monument, Alaska 5. Report Date October 1979 6.   7. Author(s) Marine Mammal Commission 8. Performing Organization     Report No.   9. Performing Organization Name     and Address   Marine Mammal Commission 1625 I Street, N.W. Washington, D.C. 20006   12. Sponsoring Organization Name       and Address Same as above.   10. Project/Task/Work       Unit No.   11. Contract or Grant No.   13. Type of Report Final Report   14.   15. Supplementary Notes     16. Abstract The waters of Glacier Bay National Monument, Alaska, appear to be an important humpback whale (_Megaptera novaeangliae_) summering area. In 1979, fewer whales used Glacier Bay than expected, based on previous observations. This report, of an Interagency Review Meeting held in Seattle, Washington, on 12-13 October 1979, discusses management and research activities relating to humpback whales in Glacier Bay National Monument and surrounding waters. 17. Originator's Key Words Humpback Whales (_Megaptera novaeangliae_) Glacier Bay National Monument, Alaska Southeast Alaska 18. Availability Statement Availability unlimited 19. U.S. Security       Classif. of the       Report   20. U.S. Security       Classif. of This Page 21. No. of Pages     22. Price

This Form may be reproduced.

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TABLE OF CONTENTS

			Page
PREFACE			1
INTRODUCTION			2
BACKGROUND			2
	Distribution and Abundance of Humpback Whales in the North Pacific		2
	Glacier Bay		3
	Humpback Whales in Glacier Bay		7
	Human Use of Glacier Bay		10
POSSIBLE CAUSE-EFFECT RELATIONSHIPS BETWEEN HUMAN USE OF GLACIER BAY AND THE DISPLACEMENT OF HUMPBACK WHALES FROM THE BAY			13
ADEQUACY OF EXISTING DATA			21
MANAGEMENT AND RESEARCH ACTIVITIES TAKEN OR UNDER CONSIDERATION			21
ALTERNATIVE MANAGEMENT ACTIONS			23
IDENTIFYING AND SELECTING THE MOST APPROPRIATE RESEARCH/MANAGEMENT STRATEGY			24
AGENCY RESPONSIBILITIES AND NEED FOR COOPERATION AND COORDINATION			26
SUMMARY			27
REFERENCES			29
APPENDICES

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LIST OF TABLES

			Page
1.	Relative abundance and distribution of identified humpback whales in southeast Alaskan waters 1967-79		8
2.	Number of humpback whales (individual census) entering Glacier Bay during "influxes"		9
3.	Age composition of humpback whales per year in Glacier Bay		9
4.	Juraszs' description of "stress behavior"		11
5.	Juraszs' vessel/aircraft classes		12
6.	Number of visitors and vessels to Glacier Bay National Monument		14
7.	Number of vessel sightings per month in each class as seen from the Juraszs' R/V GINJUR		15
8.	Average vessel sightings per day in each class as seen from the Juraszs' R/V GINJUR		16

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LIST OF FIGURES

			Page
1.	Southeast Alaska, Alexander Archipelago		4
2.	Glacier Bay, Alaska		5
3.	Glacier Bay, Alaska showing former positions of termini 1760-1966		6
4.	Commercial fishing vessel visits to Glacier Bay		17
5.	Commercial fishing activity Glacier Bay		18
6.	Fishing charter boats and private boat visits to Glacier Bay 1970-1977		19

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PREFACE

In 1976, the National Park Service initiated a study to
determine whether increased boat traffic or boating activities
were having an adverse impact on humpback whales inhabiting
Glacier Bay National Monument during the summer months. In 1978,
the whales entered the Bay as usual, but left sooner than expected.
The scientists conducting the whale studies believed that the
early departure of the whales was precipitated by increased boat
traffic in the Bay and, in 1979, the Park Service, in consultation
with the cruise ship industry, developed and implemented operational
guidelines for vessel course and speed in designated areas,
where it was felt that vessel interactions with incoming whales
could cause the most disturbance.

Researchers spent many hours looking for whales in the Bay
during the early part of the 1979 summer season, but few whales
were seen. Several interactions between vessels and those whales
present in the Bay were observed and, on one occasion, a whale
known to have had an interaction with a vessel left the Bay.
Monument personnel discussed the problem with the area office of
the National Park Service. A number of options, including
emergency closure of the Bay were considered. It was decided to
provide funds for a more thorough analysis of the available
information on whale/vessel interactions, and to consult with
the National Marine Fisheries Service pursuant to Section 7 of
the Endangered Species Act.

The NMFS was advised of the situation and, on 10 August 1979,
NPS and NMFS representatives met in Seattle, Washington to review
available information concerning the nature and possible causes
of the departure of whales from the Bay. Another meeting was
held in late August to discuss the problem with members of the
cruise ship industry. It was agreed that additional research
was needed to better define the nature and possible causes of the
problem and that a meeting should be held to discuss possible
research approaches with other professionals in the marine mammal
field. These decisions led to the meeting described in this
report.

Subsequent to the meeting reported here, the National Marine
Fisheries Service in a letter dated December 3, 1979, responded
to the National Park Service's request for a Section 7 consultation.
A copy of the NMFS's response is provided in Appendix D
of this report.

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INTRODUCTION

Humpback whales (Megaptera novaeangliae) inhabit the
inland waters of southeast Alaska, including Glacier Bay
during the summer months (June-August). In the years from
1967 through 1977, 20 to 25 individually recognizable whales
were observed feeding in Glacier Bay. In 1978, the whales
entered the bay but left earlier than expected. In 1979,
only a few humpbacks entered Glacier Bay. The limited information
available suggests that increased human activity in the
Bay may have been responsible, at least in part, for the
observed shift in distribution. Increased human use of
coastal waters is not limited to Glacier Bay and the movement
of humpbacks from Glacier Bay to areas outside the Bay may be
symptomatic of a larger problem.

The purposes of this meeting were: (1) to review available
information concerning the nature and possible causes of the
movement of whales from Glacier Bay; (2) to review present
and planned research and management actions relating to
humpback whales in Glacier Bay and southeast Alaska; and (3) to
identify additional research or management actions that may be
necessary to conserve and protect the North Pacific population(s)
of humpback whales.

The meeting was held on the 12th and 13th of October 1979,
at the College of Fisheries, University of Washington, Seattle.
The meeting agenda is included as Appendix A. Individuals who
made formal presentations at the meeting are identified on the
agenda. A list of the meeting attendees, their organizations,
addresses, and telephone numbers are listed in
Appendix B.

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BACKGROUND

Humpback whales are seasonal migrants found in all of the
world's oceans. In the North Pacific, humpback whales winter
in tropical regions over the shallow coastal shelfs associated
with the Hawaiian Islands, Baja California, central Mexico,
the Ryukyu Islands, Bonin Islands, and Mariana Islands. They
summer in cold temperate regions, also over shallow coastal
shelfs, from Point Conception, California, north through
Alaska, west through the Aleutians, and south to Honshu
Island, Japan. Calving and probably breeding occur on the
wintering grounds. Feeding is believed to occur primarily in
the summering grounds.

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In Alaska, humpback whales are known to inhabit Prince
William Sound, the waters of the Alexander Archipelago, and
the waters adjacent to Kodiak Island and the Aleutians. Some
whales may also overwinter in the northern summering areas.

The distribution, movements, abundance, and habitat
requirements of humpback whales are not well known. Based
upon Japanese catch statistics, the pre-exploitation population
of humpback whales in the North Pacific is estimated
to have been approximately 15,000. Much of the exploitation
of humpback whales occurred in the twentieth century,
especially during the early 1960's. A small number of whaling
stations established in southeast Alaska took humpbacks
between 1907 and 1922. In 1966, the International Whaling
Commission imposed a worldwide ban on the taking of humpback
whales.

The present population of humpback whales in the North
Pacific is estimated to be about 1,000 animals. The number
occurring in tropical waters during the winter is thought to
be about 600-700 in Hawaii, 200-300 in Mexican waters, and a
"few whales" in the western North Pacific. More than 100 individual
whales have been identified in the inland waters of southeast
Alaska during the summer. Tagging experiments with Discovery
Marks indicate movement between the Aleutian Islands and the
Western North Pacific; recent photo-identification studies have
shown movement from Southeast Alaska to both the Hawaiian Islands
and Baja (and southern coastal) Mexico. There is no substantive
evidence to indicate whether the number of humpback whales, on
either summer or winter grounds, in the North Pacific is
increasing or decreasing.

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Glacier Bay is located near the north end of the
Alexander Archipelago (Figures 1 and 2). The Bay opens into
Cross Sound and Icy Strait of the Inside Passage of southeast
Alaska. When Vancouver discovered the area in 1780, glacial
ice filled the Bay to its mouth (Figure 3). In 1891, when
the Bay was first mapped, Muir Inlet was still filled with
ice. Today the ice has retreated up the right (Muir Inlet) arm
of the "Y" shaped Bay to tide-water levels. Recently, glacial
ice has started to readvance in the upper reaches of the
west inlets of the Bay.

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The Bay is defined by shallow sills at its entrance
and the entrance to Muir Inlet. Constricted channels in
which tidal currents are locally strong occur between sediment
covered shores in the lower end of the Bay and the east (Muir)
inlet. Deep, unconstricted bedrock channels and basins with
weak currents occur in mid-Bay and the west inlet. These
features and the configuration of the bay produce a tidal
range of 8 meters. There is reduced mixing of waters
within the Bay and between the Bay and Cross Sound/Icy Strait.
Annual precipitation up to 4 meters, coupled with glacial
melt water, create a surface layer and flow of cold fresh
water out of the Bay. Strong flood tides push sea water into
the Bay over the sills. The dynamics of the flow may effect
the behavior and timing of the movement of whales into (on
flood tides) and out of (on ebb tides) the Bay (see below).

During the winter, an increase in sea water flow and mixing
occur. Increased nutrient levels and sunlight in spring/summer
provide sufficient nutrients and energy for phytoplankton "blooms"
to occur. In turn, zooplankters appear, especially in the
open areas of mid and lower Bay (e.g., euphausiids) and along
glacial ice faces (e.g., mysids and amphipods). By autumn,
plankton concentrations diminish as light and nutrient levels
decrease. Small schooling fish, (e.g., capelin, Mallotus
villosus and Pacific sand lance, Ammodytes hexapterus), feed on
the plankton when it becomes available. Both fish and plankton are
consumed by humpback whales as well as by other predators. Other
marine mammal species reported in the Bay are harbor seals
(Phoca vitulina), harbor porpoise (Phocoena phocoena), killer
whales (Orcinus orca), and minke whales (Balaenoptera acutorostrata).

The distribution in and use of Glacier Bay by humpback
whales was not well known until Charles and Virginia Jurasz
began observations in 1973. Prior to this, only personal
recollections of Park Service employees of the occurrence of
humpback whales in the 1950's and the 1960's exist. In
1967, 60 identifiable humpback whales were observed in three
southeast Alaskan areas, i.e., Lynn Canal, Frederick Sound,
and Glacier Bay. The number of identifiable whales remained
relatively constant until 1974 in Lynn Canal, and 1978
(July 17) in Glacier Bay (Tables 1-3). In the respective areas,
the number of identified whales decreased from 15 and 19 to
1 and 3, respectively. Concurrently, the number of identified
whales sighted in Frederick Sound increased.

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TABLE 1. Relative abundance and distribution of identified humpback
whales in southeast Alaskan waters 1967-79[a]

Year	67	68	69	70	71	72	73	74	75	76	77	78	79
Glacier Bay	20	20	20	20	20	20	25	25	25	25	25	19/3[b]	3
Lynn Canal	15	15	15	15	15	15	15	1	3	3	3	1/5	5
Frederick Sound	25	25	25	25	25	25	25	35	40	40	40	40/50	80
Total	60	60	60	60	60	60	65	61	68	68	68	60/58	88

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TABLE 2. Number of humpback whales (individual census) entering Glacier Bay during "influxes". (modified from Jurasz and Jurasz, 1979)

TABLE 3. Age composition of humpback whales per year in Glacier Bay (modified from Jurasz and Jurasz, 1979)

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Identifiable humpback whales were sighted in Glacier Bay
each year, 1976-1977, for a six to twelve week period. In 1978,
all but three whales departed the Bay after 16 days. In the
summers of 1976-1978 two influxes of whales occurred (Table 2).
The Juraszs' define an influx of whales as those whales that enter
and remain in the Bay for a minimum of three weeks. The
second influx arrived 7-14 days after extreme low tides
occurred in late June-early July and presumably moved into the
Bay on flood tides. In 1979, a single influx comprised of 3 whales
entered the Bay. The age composition of identified whales
using Glacier Bay was categorized by the Juraszs' for 1976-1978
(Table 3).

During the period spent in the Bay, humpback whales have
been observed to feed on capelin, euphausiids (Euphausia pacifica),
and pandalid shrimp (Pandulus borealis). There appear to be
three generalized feeding relationships: 1) early-season feeding
on shrimp in the upper Bay; 2) mid-season feeding by concentrations
of whales on capelin in the lower Bay; and 3) late-season feeding
(around August 5) by concentrations of whales on euphausiids in
mid-Bay.

Behaviorally, humpback whales appear to lunge up through
concentrated schools of prey during mid-season and use
"bubble-netting" as a means of concentrating less dense
and/or numerically fewer prey earlier and later in the
season. In other areas of southeast Alaska, humpbacks
are reported to also feed on herring (Clupea harengus pallasi),
shrimp, and possibly other small schooling (swarming) prey.
The Juraszs' believe that humpbacks establish feeding
territories in the Bay, and have described eight "stress
behaviors" associated with violations of those territories
(Table 4). The data collected by the Juraszs are extensive
(including human use of Glacier Bay) but have not yet been
completely analyzed.

John Muir popularized Glacier Bay, leading to tourist
activity into the early 1900's, when loose ice resulting from
earthquake activity prevented cruise vessels from operating
within the Bay. Glacier Bay was designated a National
Monument February 26, 1925, the area being added to April 18, 1939.

Vessel and tourist numbers remained low until the late
1960's-early 1970's. Close to 100 percent of the visitors to
the Bay use vessels, either entering the Bay aboard them or
making use of them to tour the Bay after arriving by aircraft.
The Juraszs' developed a classification scheme for vessels
and aircraft based upon activities of the craft in the Bay,
their size, hull design, and engine characteristics (Table 5).

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TABLE 4. Juraszs' description of "stress behavior" (Progressing from the least "stressful" to the most "stressful") (modified from Jurasz and Jurasz, 1979.)

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TABLE 5. Juraszs' vessel/aircraft classes (after Jurasz and Jurasz, 1979)

Class 1	Touring Vessel Over 10k Tons
Class 2	Touring Vessel 5k-10k tons
Class 3	Commercial Fishing/Crabbing
Class 4	Charter & Pleasure
Class 5	Cabined High RPM Outdrive Units
Class 6	Sailboat Using Aux. Power
Class 7	Utility Craft, Outboard Engine
Class 8	Kayak, Sailboat (no engines)
Class 9	Aircraft, Fixed
Class 10	Aircraft, Rotor
Class 11	Aircraft, Jet
Class 12	Hydrofoil
Class 13	Another Humpback
Class 14	Killer whales
Class 15	Minke Whales
Class 16	R/V GINJUR (Juraszs' research vessel)
Class 17	Wake Only

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The increase in visitors and vessels to Glacier Bay is presented
in Tables 6-8. (Data included in Table 6 cannot be compared
to data presented in Table 7 because of difference in methods
of data collection, sample area, time, effort, etc.)

Commercial fishing vessel activity in the Bay was probably
low until the 1970's. Since 1972 (it is not known whether
data are available prior to 1972) commercial fishing vessel
visits have fluctuated (Figure 4), but fishing activity has
been greatest during the summer months (Figure 5). Sport
fishing visits have increased during the same time period
(Figure 6).

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POSSIBLE CAUSE-EFFECT RELATIONSHIPS BETWEEN HUMAN USE OF GLACIER BAY AND THE DISPLACEMENT
OF HUMPBACK WHALES FROM THE BAY[5]

The meeting participants agreed that the observed decrease
in the number of whales in Lynn Canal in 1974 and
Glacier Bay in 1978 may be attributable to a number or combination
of factors. Available evidence suggests human activity was
at least one of the causes, or served to trigger otherwise
"natural events". In Lynn Canal, humpback whales were known
to feed on herring (Clupea harengus pallasi). In 1974, the
year a herring fishery began, the number of humpback whales
dropped to one (Table 1). Between 1974 and 1978 fishing
continued. There was no fishing in 1979.

Use of the Canal by Class 5 vessels (cabin cruisers with
high RPM outdrive units) increased by 15-20 percent each year
after 1970 (Jurasz and Jurasz, 1979, p. 85). Three humpback
whales were seen in Lynn Canal during the 1975-1977 seasons,
the number increasing to five in 1978-1979. The relationship
between vessel activity, fishing effort, fish take, fish
abundance, and the presence and activity of whales in Lynn
Canal does not appear to be documented.

In Glacier Bay, increased vessel traffic may be one of
the factors responsible for the movement of humpback whales
from the Bay in 1978 and 1979. The Juraszs' data, while not
evaluated fully, suggest that there has been a general increase
in avoidance by humpback whales of Class 1 through 5 vessels
over the three year period, 1976-1978.

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TABLE 6. Number of visitors and vessels to Glacier Bay National Monument.[a]

Year	Visitation		Increase	Private Vessels Juraszs' Classes 1-2	Cruise Ships (incomplete count) Juraszs' Classes 4-8
1965	1,800
1969	16,000		789% over 1965		450
1970	29,700		86% over 1969
1972				33
1978	109,500		269% over 1970 584% over 1969	123	1800
1979				123

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TABLE 7. Number of vessel sightings per month in each class as seen
from the Juraszs' R/V GINJUR. (from Jurasz and Jurasz, 1979)

	1977					1978
Vessel Class	June	July	August	TOTAL		June	July	August	TOTAL
1	20	22	11	53		17	25	8	50
3	67	18	6	91		62	31	64	157
4	37	42	30	109		29	125	64	218
5	38	45	17	100		27	61	24	112
6	3	14	0	17		0	29	19	48
7	6	4	6	16		8	4	5	17
8	7	2	7	16		2	12	3	17
12							4	3	7

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TABLE 8. Average vessel sightings per day in each class as seen from
the Juraszs' R/V GINJUR. (Modified from Jurasz and Jurasz, 1979)

Vessel Class	1977	1978	Percent Decrease	Percent Increase
1	3.90	3.20	18%
3	5.74	13.47		135%
4	8.38	16.87		101%
5	6.93	8.19		18%
6	1.11	3.99		259%
7	1.21	1.38		14%
8	1.24	1.18	5%

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J F M A M J J A S O N D SALMON     King L L L L M H H H M L L L     Red   L M M M L           Coho   H H H H         Pink   L H H H M         Chum   L H H M M     HALIBUT   CRAB     Tanner     King     Dungeness     Key        commercial fishing occurs   L   Low level     M     Medium level       H       High level

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Natural changes in the environment and/or in the behavior
of whales have occurred concurrently with increased human/vessel
activity in Glacier Bay. Such natural changes include
spatial and temporal trends or cycles in the physical
(temperature, tides, currents, turbidity, etc.), chemical
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(salinity, dissolved gases, inorganic/organic substances—nutrients,
etc.) or biological (primary productivity,
zooplankton, nekton, benthic species, predators, etc.)
properties or characteristics of the waters within and outside
the Bay. Temporal and/or spatial differences in relative
abundance of three different prey species within and outside
the Bay may have occurred and been responsible, at least in
part, for the movement of humpbacks from Glacier Bay.
At this time, data are inadequate to relate the movement of
humpback whales from Glacier Bay in 1978 and 1979 to physical,
chemical, or biological factors. Meeting participants felt
that physical and chemical factors were unlikely to have
changed sufficiently between 1976 and 1978 to affect humpback
whales, while biological factors, perhaps as a result of
physio-chemical changes, could have changed sufficiently to
have caused or contributed to the movement.

Human activity may have caused changes in the physical,
chemical, or biological environment, effecting humpbacks
directly or indirectly. Human and vessel activities
may have occurred such that the space (vertical and/or
horizontal) available to whales for normal activities was
less than that necessary (below some threshold level or
value). "Too many" vessels may have transited an area and/or
approached whales "too closely" for "too long" a period of
time, producing visual, acoustic, tactile, chemical, or
other as yet unknown stimuli at levels or values (magnitude,
intensity, duration, frequency, interval, etc.) greater
than the whales would tolerate. The physical-acoustic
environment may have changed as a result of sounds produced
by vessels. Vessel sounds may be modified, amplified,
intensified, etc., as a result of the geological/topographical
features of Glacier Bay (and perhaps Lynn Canal as well). Direct
interference with the whales' own sounds may have occurred or
"environmental" sound levels may have exceeded certain thresholds.
Basic data on the acoustic properties and characteristics of
Glacier Bay with and in the absence of vessels are lacking.

Changes in water quality may have occurred through
pollution. Data are insufficient to document the past or
present levels of pollution, but they were thought by meeting
participants to be relatively low.

Changes in the biological environment induced by human
activity may be contributory to the movement of whales. Movement
from Lynn Canal may have resulted from direct competition
for the same resource at the same time, by depletion of the
resource below levels sufficient to support humpbacks or as a
result of noise or the presence of fishing vessels. Fishing
activity or overharvesting (depletion of resource) of other
species at other trophic levels may indirectly impact humpbacks
through the food web/chains. There are insufficient data to
prove or disprove such hypotheses at this time.

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In summary, a best interpretation of the available data is
that uncontrolled increase of vessel traffic, particularly of
erratic charter/pleasure craft, may have adversely altered the
behavior of humpback whales in Glacier Bay and thus may be implicated
in their departure from the Bay the past two years. The causal
mechanism of this adverse reaction to increased vessel traffic
remains unknown. The effects of increasing vessel traffic
apparently are exacerbated by the narrow physical confines of
Glacier Bay. This analysis is not clear-cut, however, and may
be confounded, at least in 1979, by possible shifts in the
occurrence and availability of preferred prey species of humpback
whales.

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ADEQUACY OF EXISTING DATA

In the Background and Possible Cause and Effect sections it
was stated that insufficient data exist to indicate cause and effect
relationships. Data are not sufficient in many areas, e.g.:

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MANAGEMENT AND RESEARCH ACTIVITIES
TAKEN OR UNDER CONSIDERATION[6]

The National Park Service (NPS) is responsible for managing
and overseeing the use of Glacier Bay National Monument
in support of the objectives defined for the Service, when it
was established in 1916; an excerpt from the Act creating the
Service in 1916 states that the purpose of the Service is:

The intent in establishing the Monument is defined in the
Proclamations of 1925 and 1939, sections of which are excerpted
and presented below.

The management plans developed by the National Park Service for
the Glacier Bay National Monument did not anticipate, and
apparently have not been adequate to deal with, the increased
visitor and vessel traffic and their use of the marine environment
in the 1970's. Title 36 of the Code of Federal Regulations,
under which the National Park Service operates, contains a
section requiring any commercial business conducted or operating
within the boundaries of Service area to have a permit issued
by the Service. The cruise ship industry companies have not
as yet been placed under a permit system. However, it is the
intent of the Service to establish a regular system in the
future. All other commercial ventures operating on lands and
waters of the Monument are under contract or permit. Fishing
vessel activity is unregulated although the take of
Pacific halibut, (Hippoglossus stenolepis) is regulated by
the International Pacific Halibut Commission, and the take of
salmon and other finfish and shellfish is regulated by the Alaska
Department of Fish and Game (ADFG). The need for additional
resource/use plans and regulatory programs is recognized by the
National Park Service.

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The NPS funded field studies of humpback whales by the
Juraszs in 1976-1979, analysis of some of the Juraszs' data,
and Hale's and Rice's (of the NPS Alaska area office)
report, "The Glacier Bay Marine Ecosystem—A Conceptual,
Ecological Model" completed in April 1979.

The movement of humpback whales in 1978 from Glacier
Bay to surrounding waters and the suggestion by the Juraszs'
field observations, that there may be a cause and effect
relationship between vessel activity and the whales' movement,
led the NPS to restrict some vessel activities in the 1979
season, and to seek Endangered Species Act Section 7 consultations
with the National Marine Fisheries Service in August 1979. The
Section 7 consultations were not completed at the beginning of
the meeting. Based in part upon NMFS's recommendations, the
NPS will consider various future management alternatives.
Restrictions imposed in 1979 were temporary (emergency closure
authority under Title 36 C.F.R.). Any regulations imposed for
1980 cannot be under emergency closure authority (unless an
emergency does arise which was unforeseen in setting up
regulatory systems). Regulations which can be foreseen at this
time as being necessary would have to proceed through the
normal Federal Register publication process. Enforcement of all
Federal laws and regulations within Glacier Bay is considered
to be the responsibility of the NPS.

The National Marine Fisheries Service (NMFS) has overall
responsibility, under the Marine Mammal Protection Act of 1972,
for the conservation and protection of all whales including
humpback whales. The National Marine Fisheries Service in
cooperation with the Juraszs has conducted censuses of humpback
whales in southeast Alaskan waters in 1975 and 1976, used radio
tags to follow individual whales in Alaskan waters in 1976-78,
maintains a catalogue of humpback whale photographs and has
developed a computerized retrieval photo-identification system.
No research was conducted by NMFS in 1979. NMFS enforcement of
laws and regulations is conducted by a few people responsible
for large areas in southeast Alaska. A contract with the State
of Alaska until August 1, 1979, provided a broader presence of
enforcement personnel. That contract was not renewed. The
NMFS is now fully responsible for enforcement activities relating
to humpback whales except in areas such as Glacier Bay where the
responsibility is shared.

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ALTERNATIVE MANAGEMENT ACTIONS

Based on available information, vessel activity may have been
a factor contributing to the movement of whales from Glacier Bay
in 1978 and 1979. Alternatives available to manage vessel
traffic (assuming increased traffic has had or will have an
adverse effect on humpback whales) include:

---

IDENTIFYING AND SELECTING THE MOST APPROPRIATE
RESEARCH/MANAGEMENT STRATEGY

Factors that should be considered in making research/management
decisions include (1) that the humpback whale is an
endangered species; (2) that there are statutory requirements
to protect the whales and their habitats; (3) that the cause
of the present problem is uncertain; (4) that the purpose of
the Monument is to provide for educational, recreational,
and scientific experiences; and (5) that limiting access or
restricting or closing the Monument to some or all vessel
activity could affect commercial and private enterprises,
including fishing.

[Pg 25]
Additionally, there are a number of types and possible
consequences of decision errors that should also be considered—e.g.,

The optimal short-term research/management strategy would
minimize the risks associated with the kinds of errors
discussed above, and include actions such as the following:

The optimal long-range research/management strategy would
include:

---

AGENCY RESPONSIBILITIES AND NEED FOR COOPERATION AND COORDINATION

There are many individuals, groups and organizations
interested or involved in finding solutions to problems
associated with humpback whales and human activities in
Glacier Bay. The need for management planning and research
[Pg 27]
programs has been identified. The identification of interested
and responsible organizations is necessary so that cooperative,
coordinated planning and research can occur. Hopefully, by
developing such plans or projects, minimum resources will be
expended to obtain satisfactory solutions. In addition, by
involving all interested and responsible individuals, groups,
or organizations at an early stage, cooperative efforts can
be maximized and disagreements identified and minimized.

The prime responsibilities of the National Marine Fisheries
Service and the National Park Service have been identified.
Other Federal agencies that should or might profitably be
involved include the Bureau of Land Management, the Office of
Coastal Zone Management, Sea Grant, the U.S. Fish and Wildlife
Service, the U.S. Geological Survey, the U.S. Coast Guard,
the Environmental Protection Agency, and the Army Corps of Engineers.
State agencies that should or might be profitably involved
include the Alaska Department of Fish and Game, the State
Coastal Zone Management Commission, and the Alaska Department
of Natural Resources. Commercial and recreational companies
that organize fishing, tour, and charter activities, private
boaters, academic/scientific communities, and environmental
organizations are also important. Some of these organizations
have on-going, or plan to initiate, research projects, which may
provide data and information of importance to the problems
discussed in this report.

The Bureau of Land Management, New York Outer Continental
Shelf (OCS) Office, is presently initiating noise effects
studies on marine mammals. The U.S. Geological Survey at
Tacoma, Washington and Menlo Park, California is describing
and mapping marine sediment distribution, thickness and
characteristics within Glacier Bay. J. P. Mathews, of the
Institute of Marine Science, University of Alaska, is
summarizing the physical characteristics, especially water
mass characteristics and dynamics, of Glacier Bay. If
possible, these studies should be coordinated such that a
maximum amount of information can be obtained and used in
the management and research activities related to Glacier Bay
National Monument and the humpback whale.

---

SUMMARY

Humpback whales in the North Pacific are migratory,
spending the summer months in northern waters including
the inland waters of southeast Alaska. Records have been
maintained on the number of identifiable humpbacks seen in
these waters including Glacier Bay. In 1978, humpbacks
departed Glacier Bay after being "in residence" for a far
shorter time period than recorded previously; all but three
whales left the Bay within 24 hours of entering in 1979.
[Pg 28]

There has been an increase in vessel traffic and
activity within Glacier Bay during the 1970's. Such activity
may have been a factor in the movement of humpbacks from
Glacier Bay. Other factors which may have been at least
contributing but for which no known information exists, or is
inadequate at best, include: natural environmental changes
(chemical, physical, biological) or natural changes in the
movement of the whales.

Present management and research plans and activities
did not anticipate and, therefore, are inadequate to deal
effectively with present day problems associated with a rapidly
growing influx of people and vessels/aircraft into any
environment with limited space and resources. Some human
activities and the activities and behavioral patterns of
humpback whales may be mutually exclusive.

The most apparent important short-term research need is
to analyze and evaluate all available data, in order to
develop short and long term management plans and research
programs.

---

[Pg 29]

REFERENCES

---

[Pg 30]

APPENDIX A

12 October 1979

9:00		Discussion of meeting objectives, agenda, and procedures (Dr. Robert Hofman, Marine Mammal Commission)
9:15		Overview of available information on the distribution, abundance, and habitat requirements of humpback whales in the North Pacific (presentation by Dr. Michael Tillman, National Marine Fisheries Service)
9:30		Physical/chemical characterization and history of Glacier Bay (presentation by Mr. Gregory Streveler, Glacier Bay National Monument)
		a.   location, dimensions, geomorphology      b.   geologic history and structure of the basin      c.   glaciology      d.   current patterns      e.   water characteristics (temperature, salinity, nutrients)      f.   climate
10:00		Review of available information concerning the past and present utilization of Glacier Bay by humpback whales (presentation by Mr. Charles Jurasz)
		a.   historical distribution, movement, and abundance      b.   present distribution, movement, abundance, and behavior
10:30		Coffee Break
10:45		Review of information concerning the past and present human use and its possible effects on Glacier Bay (presentation by Mr. John Chapman)
11:15		Possible reasons for observed changes in utilization of Glacier Bay by humpback whales (discussion led by Dr. Robert Hofman)
12:15		Lunch

[Pg 31]

12 October 1979 (Continued)

1:30		Review of on-going and planned research and management activities in Glacier Bay and contiguous waters
		a.   1:30—National Park Service (presentation by Mr. Jim Larson and/or Mr. John Chapman)      b.   1:50—National Marine Fisheries Service (presentation by Mr. Milsted Zahn and/or Dr. Michael Tillman)
2:15		Identification of additional research/management actions, if any, needed to protect humpback whales in Glacier Bay, e.g.:
		a.   Research 1.   Physical   i.  acoustic characteristics of the Bay ii. water currents and tidal factors 2.   Biological   i.  identification of whale food and its distribution and abundance ii.  additional whale behavior studies including harassment indicators 3.   Human Factors   i.  acoustic characteristics of vessels      b.   Management 1.   comprehensive monitoring of vessel use patterns throughout the Bay 2.   vessel routing, number, and speed controls 3.   seasonal and/or area closures
4:30		As possible, summarize and rank research and management activities not included in on-going or planned activities.
5:00		Adjourn

13 October 1979

9:00		Continue discussion on ranking research and management activities not included in on-going or planned activities
10:00		Coffee Break
10:15		As possible, identify target initiation dates, target completion dates, optimal methods, time, money, personnel, logistic support, and equipment needed to initiate and complete ranked research and management projects
11:45		Closing Remarks
12:00		Adjourn

---

[Pg 32]

APPENDIX B

LIST OF PARTICIPANTS AT MEETING TO REVIEW
INFORMATION AND ACTIONS CONCERNING HUMPBACK WHALES
IN GLACIER BAY NATIONAL MONUMENT

Mr. James A. Blaisdell

National Park Service

Fourth & Pike Building, Room 601

Seattle, Washington 98101

206/442-1355

FTS: 399-1355



Mr. Rob Bosworth

Institution for Marine Studies—HA-35

University of Washington

Seattle, Washington 98105

206/543-7004



Mr. John F. Chapman

Superintendent

Glacier Bay National Monument

P.O. Box 1089

Juneau, Alaska 99802

907/586-7137



Dr. William C. Cummings

Scripps Institution of Oceanography

Marine Physical Laboratory (A005)

La Jolla, California 92093

714/452-2852

and

Oceanographic Consultants

5948 Eton Court

San Diego, California 92122

714/453-3257



Dr. Frederick C. Dean

Professor of Wildlife Management

Cooperative Park Studies Unit

Room 210, Irving Building

University of Alaska

Fairbanks, Alaska 99701

907/479-7672



Dr. Donald R. Field

Regional Chief Scientist

National Park Service

Pacific Northwest Region

Fourth & Pike Building, Room 601

Seattle, Washington 98195

206/442-1355

FTS: 399-1355

[Pg 33]

Mr. Robert Giersdorf

President

Glacier Bay Lodge, Inc.

Park Place Building, Suite 312

Seattle, Washington 98101

206/624-8551



Dr. Louis Herman

University of Hawaii, Kewalo Basin

Marine Mammal Laboratory

1129 Ala Moana

Honolulu, Hawaii 96814

808/537-2042



Mr. Larry Hobbs

Wildlife Biologist

U.S. Fish and Wildlife Service

National Fish and Wildlife Laboratory

Smithsonian Institution

Washington, D.C. 20560

202/343-4516



Mr. Charles M. Jurasz

Ms. Virginia Jurasz

Sea Search

P.O. Box 93

Auke Bay, Alaska 99821



Mr. James W. Larson

Deputy Regional Chief Scientist

National Park Service

Alaska Area Office

540 W. 5th Avenue

Anchorage, Alaska 99501

907/271-4243



Mr. Paul A. Larson

Chief Resource Management and

Visitor Protection

National Park Service

Pacific Northwest Region

Fourth & Pike Building, Room 601

Seattle, Washington 98101

206/442-5670

FTS: 399-5670



Mr. William Lawton

National Marine Mammal Laboratory

NOAA/NMFS

7600 Sand Point Way, N.W., Building 32

Seattle, Washington 98115

206/442-5215

[Pg 34]

Dr. Jack W. Lentfer

Alaska Department of Fish and Game

210 Ferry Way

Juneau, Alaska 99801

907/586-6702



Dr. Katherine Ralls

Office of Zoological Research

National Zoo

Smithsonian Institution

Washington, D.C. 20008

202/381-7315



Mr. Dale W. Rice

National Marine Mammal Laboratory

NOAA/NMFS

7600 Sand Point Way, N.E., Building 32

Seattle, Washington 98115

206/442-5004



Mr. G. P. Streveler

Research Biologist

Glacier Bay National Monument

Gustavus, Alaska 99826

907/697-3341



Mr. Steven L. Swartz

1592 Sunset Cliffs Boulevard

San Diego, California 92107

714/222-9978



Dr. Michael F. Tillman, Director

National Marine Mammal Laboratory

NOAA/NMFS

7600 Sand Point Way, N.E., Building 32

Seattle, Washington 98115

206/442-4712

FTS: 399-4711



Mr. Douglas G. Warnock

Deputy Director Alaska Area

National Park Service

540 West 5th Avenue, Room 202

Anchorage, Alaska 99501

907/271-4243



Mr. Roland H. Wauer

Chief, Division of Natural Resources

National Park Service

1100 L Street, N.W.

Washington, D.C. 20240

202/523-5127

[Pg 35]

Dr. A. R. Weisbrod

Endangered Species Coordinator

National Park Service

1100 L Street, N.W.

Washington, D.C. 20240

202/523-5127



Mr. Allen A. Wolman

National Marine Mammal Laboratory

NOAA/NMFS

7600 Sand Point Way, N.E., Building 32

Seattle, Washington 98115

206/442-4583



Mr. Milsted C. Zahn

Enforcement Division

Alaska Regional Office

National Marine Fisheries Service

Box 1668

Juneau, Alaska 99802

907/586-7228

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[Pg 36]

APPENDIX C

---

[Pg 39]

APPENDIX D

Mr. John Chapman

Superintendent

Glacier Bay National Monument

National Park Service

Box 1089

Juneau, Alaska 99802



Dear Mr. Chapman:

This letter responds to your August 4, 1979, request for consultation
pursuant to Section 7 of the Endangered Species Act of 1973, as amended,
relative to the population of the humpback whale in Glacier Bay, Alaska.

Your problem statement of the same date outlines the basic issue of human
activity in Glacier Bay National Monument that might be affecting humpback
whales. Section 7 of the Endangered Species Act requires that each federal
agency insure that its actions do not jeopardize the continued existence of
any listed species or result in the destruction or adverse modification of
critical habitat of such species. The consultation process requires our
comment and opinion on the problem.

Within this context, our response addresses those National Park Service
(NPS) actions controlling human activity that may, in turn, affect the
humpback whales within Glacier Bay.

In the North Pacific, the summer range of the humpback whale encompasses
the area from Bering Strait south to the Subarctic Boundary (ca. 40° N lat)
and extends in the east to about Point Conception, California, and the Sanriku
Coast of Honshu Island in the west. Humpbacks range into shallow coastal
waters more frequently than do most other balaenopterids and regularly occur
in sheltered inside waters of Prince William Sound and the Alexander
Archipelago of southeastern Alaska.

The wintering grounds of humpbacks in the North Pacific are centered in
three areas: (1) the coast and adjacent islands of west-central Mexico; (2)
the main Hawaiian Islands; and (3) the Bonin, Ryukyu, and Mariana Islands in
the western North Pacific. Some humpbacks that summer in southeastern Alaska
are known to migrate to both the Mexican and Hawaiian wintering grounds,
although others are found in southeastern Alaska during all months of the
year.

Prior to the rise of modern whaling in the late 1800's, the world
population of humpback whales exceeded 100,000, mostly in the Southern
Hemisphere. The North Pacific population probably numbered roughly 15,000 at
the turn of the century.

[Pg 40]
Whaling in southeastern Alaska began in 1907 with the establishment of
two land stations. The number of humpback whales at the start of this
earliest exploitation is unknown. Consistent catch records are available only
for 1912-1922, during which time 185 humpbacks were taken, with a peak catch
of 39 in 1916.

Since 1922, no whaling has been conducted in the territorial waters of
southeastern Alaska. However, the humpback whales of the inside waters were
exposed to additional exploitation as they migrated across the high seas or
through the coastal territorial waters of British Columbia, Washington,
California, and Baja California.

By 1966, when humpbacks were accorded complete legal protection by the
International Whaling Commission, the world population of the species had been
reduced to about 5,000. The North Pacific population now numbers about 1,000,
of which 600 or 700 winter in the Hawaiian Islands, and 200 or 300 winter in
Mexico. Only a few humpbacks have been sighted on the western North Pacific
wintering grounds in recent years. Since 1966 no trends in abundance have
been observed either for the North Pacific population as a whole or on any of
its wintering or summering grounds, including southeastern Alaska.

Based upon aerial and vessel surveys, the population that spends the
summer in the inside waters of southeastern Alaska numbers at least 70.
Photoidentification studies now underway tentatively reveal that the
population may exceed 100. Although it ranges throughout the area from Sumner
Strait northward, its main concentration areas are Frederick Sound-Stephens
Passage, where a minimum of 40 whales occurs, and Glacier Bay, where 20-25
whales occur. Humpback whales congregate in these areas to feed upon the
summer blooms of euphausiids, herring, and capelin. Some whales arrive in
June and stay on through early September, although as mentioned earlier, other
animals appear to remain through the winter months.

When humpback whales historically began occupying Glacier Bay is unknown,
but they have occurred there every summer over the past seven years of
investigation. Photoidentification techniques indicate that certain
individuals repeatedly return to feed there.

The availability of these and other feeding areas in southeastern Alaska
has not been constant over the years. Although Glacier Bay has lately been a
prominent feeding area, this was not always so since the area was covered by
an ice sheet during the 18th century; at that time the humpback population was
presumably at its maximum pre-exploitation level. There is some indication
that a seasonal feeding area in Lynn Canal was avoided by humpbacks coincident
with the onset of a herring fishery in 1972. With the cessation of that
fishery, humpbacks reoccupied the area in 1979. The possibility cannot be
discarded that these events are related.

The NPS records indicate that during 1976 and 1977, 20-24 individual
humpback whales moved into Glacier Bay during June and remained there into
August. In 1978 this pattern of use changed when most of the animals departed
[Pg 41]
by mid-July. In 1979 this use was modified further with fewer whales entering
the Bay and very few of those remaining in the Bay. Observations prior to
1976 are more general in nature, rather than numerical counts of record.

Human use of the Bay is reflected in NPS records, to wit:

Year		Visitor Days		Large Ships		Private Boats		Fishing Vessels
1965		1,800
1969		16,000				115
1970		30,000				165
1975		72,000		113		353		824
1976		85,000		123		318		656
1977		120,000		142		534		523
1978		109,000		123		699		458

Most visitor use is via water access, with cruise ship and recreational
craft visitation levels increasing rapidly in recent years.

The recent NPS study indicates that increasing vessel traffic in Glacier
Bay may be implicated in the apparent departure of whales from Glacier Bay in
1978 and 1979. Data on the number of observed whale-vessel interactions in
Glacier Bay enables calculation of the following "interaction" index (data for
1979 not available):

Year		Whale-vessel Interactions		Hours Observed		Index (interactions/hour)
1976		98		261.1		0.38
1977		201		407.1		0.49
1978		268		397.5		0.67

Thus the occurrence of whale-vessel interactions increased 29 percent and
76 percent respectively in 1977 and 1978 over the 1976 base level. Despite
mitigative regulations in 1979, observers noted that whale-vessel interactions
continued at substantial frequencies.

The NPS data indicate that behavior of the humpback whales in Glacier Bay
changed significantly in 1978. Comparison of the frequency distributions of
behavioral responses indicates that, whereas distributions were the same in
1976 and 1977, both years were statistically different from 1978. In 1978,
more avoidance behavior occurred than in previous years, suggesting that the
whales reacted to the increased level of vessel traffic in 1978. However, the
causal mechanism for these reactions (whether it be increased noise or visual
stimuli) remains unknown.

All classes of vessels were not implicated equally in the increased level
of interactions which occurred in 1978. Cruise ship visitations actually
decreased 14 percent in 1978 from the 1977 high, while charter/pleasure craft
visitations increased 120 percent between 1976 and 1978. Commercial fishing
vessel traffic decreased 30 percent between 1976 and 1978. Charter/pleasure
craft were often observed to change direction and travel toward whales for a
closer look. Cruise ships and commercial fishing vessels, on the other hand,
[Pg 42]
neither paused for nor actively followed whales. Thus the most likely source
for increased interaction would appear to be the increased visitations by
charter/pleasure craft in 1978.

This conclusion seems to agree with the perceptions of scientists
examining other similar situations. The workshop on problems related to
Hawaiian humpback whales, sponsored by the Marine Mammal Commission in 1977,
concluded that vessel traffic not oriented toward whales did not ordinarily
seem to disturb them. Indeed, it was concluded that whales seem readily to
habituate to constant or familiar noises such as those produced by ships of
passage. A recent review on the possible effects of noises emanating from
offshore oil and gas development concluded that, unlike the abrupt response to
sudden disturbances, most whales become habituated to low-level background
noises such as would be associated with ship traffic (Geraci, J. R., and
D. J. St. Aubin, "Possible Effects of Offshore Oil and Gas Development on
Marine Mammals," prepared for the Marine Mammal Commission, August 1979.)
Moreover, it was noted that such behavior forms the underlying basis for the
success of whale watching cruises. Thus the erratic actions of
charter/pleasure craft rather than the more constant action of cruise ships
may be the major factor in possible harassment by vessels within Glacier Bay.

Cruise ships also may be implicated as potential sources of disturbance
due to the physical setting within Glacier Bay. A direct analogy may be seen
in the lagoons of Baja California where gray whales calve. Heavy barge and
freighter traffic associated with the salt industry, as well as a dredge
operating continuously in the lagoon's mouth, apparently drove gray whales out
of Laguna Guerrero Negro between 1957 and 1967. The whales reinvaded in
substantial numbers when vessel traffic was eliminated. The continued high
use of Laguna Ojo de Liebre by gray whales suggests that the movement of salt
barges, beginning there in 1967, may not have been such a nuisance. However,
since Laguna Ojo de Liebre is a much larger area than Laguna Guerrero Negro
and has a much wider entrance, the whales there may simply have been able to
move and coexist next to the barges. Such luxury of space may not be
available to the humpback whales of Glacier Bay and, due to geological
configurations of its basin, vessel noise may be accentuated there. These
factors may account for the unexpected reaction of humpbacks to cruise ships
in Glacier Bay.

The apparent departure of humpback whales from Glacier Bay in 1978 and
1979 may also be due in part to a change in the availability of food.
Euphausiids have historically been the primary feed within Glacier Bay in
July-August, although little research has been done to compare yearly levels
of this feed or to determine what level is necessary to support the whales.
The only available information derives from vertical plankton tows by the
REGINA MARIS in August 1979, which indicated that fewer euphausiids (5
percent) occurred in Glacier Bay as compared to Frederick Sound-Stephens
Passage. The humpbacks may have found the Glacier Bay food levels to be too
low, particularly in the face of continued high vessel use, and simply
departed to search for better concentrations elsewhere.

A similar abandonment of a prime feeding area, the Grand Banks, was
observed for the Northwest Atlantic humpback population and was thought to be
associated with the overfishing of capelin stocks there. Consequently, the
[Pg 43]
occurrence and distribution of humpback whales may be generally dependent upon
the occurrence and availability of its desired prey species.

In a worst case analysis, Glacier Bay is a feeding ground, and its long-term
abandonment would not be conducive to the conservation of the humpback
whale. Up to 20 or 25 individual whales would relocate to other areas,
increasing competition for food there. In such case a greater expenditure of
energy might be required to obtain the same quantities of food than would be
required in Glacier Bay. An increased energy expenditure would tend to
decrease the likelihood of humpbacks successfully increasing their numbers,
since growth and the onset of sexual maturity would be delayed.

Our present interpretation of the available data is that uncontrolled
increase of vessel traffic, particularly of erratically traveling
charter/pleasure craft, probably has altered the behavior of humpback whales
in Glacier Bay and thus may be implicated in their departure from the Bay the
past two years. Our conclusion, then, is that continued increase in the
amount of vessel traffic, particularly charter/pleasure craft, in Glacier Bay
is likely to jeopardize the continued existence of the humpback whale
population frequenting Southeast Alaska. The alteration in the distribution
of the whales in Southeast Alaska can be expected to appreciably reduce the
likelihood of the recovery of the North Pacific humpback population,
especially when viewed as an incremental aggravation of the problem of
humpback/human interaction in general.

Until research reveals the need for more specific action, if any, we
offer the following as reasonable and prudent alternatives that the NPS should
institute in Glacier Bay to avoid jeopardizing the continued existence of the
North Pacific population of humpback whales:

We recommend that total vessel use of the Bay be restricted to 1976
levels, at the very least, since that year preceeded the high point of visitor
use in Glacier Bay during 1977. Commercial use of the Bay is predicated on a
permit system that should offer good control and accountability of the tour
industry. The routing of large vessels is relatively easy to regulate.
Recreational craft present the greater challenge to management control. The
continuing increase in the amount of recreational traffic in the Bay lends
considerable urgency to establishing effective controls.

Collectively, regulations should address vessel routing and vessel
maneuvering. The NPS has already regulated these activities to some extent.
Specific routes should be published, but the system should be flexible enough
to accommodate changes of areas of concentrated feeding activity.

We further recommend curtailment of vessel operator discretion in
pursuing, or approaching, whales. General guidelines prohibiting the pursuit
or willful or persistent disturbance of whales through vessel maneuvering
probably would offer better enforceability and public compliance than would
detailed regulations based on specified distances. Vessel operator behavior
should receive a thorough public educational effort, possibly through an
informative notice to each vessel.

[Pg 44]
Finally, we recommend that monitoring of the humpback population and of
whale-vessel interactions be continued and that all current data be fully
analyzed. New research should also be undertaken (1) to characterize the food
and feeding behavior of humpback whales in Glacier Bay and other areas; (2) to
ascertain the acoustic characteristics of vessels within the Bay and in other
areas with the aim of identifying equipment and/or modes of operation which
are inimical to the whales; and (3) to compare behavioral responses of the
humpbacks to vessels in Glacier Bay with those observed in other areas of
southeastern Alaska.

The conclusions and recommendations stated herein constitute our
biological opinion, and we consider consultation on this matter to be at an
end. Should significant new information or factors not considered in this
opinion arise, however, either we or NPS are obligated to reinitiate
consultation.