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Tuesday, May 19, 2020 | History

1 edition of Ecosystem change and the decline of marine mammals the eastern Bering Sea found in the catalog.

Ecosystem change and the decline of marine mammals the eastern Bering Sea

Ecosystem change and the decline of marine mammals the eastern Bering Sea

testing the ecosystem shift and commercial whaling hypotheses

  • 206 Want to read
  • 13 Currently reading

Published by Fisheries Centre, University of British Columbia in Vancouver, B.C .
Written in English

    Subjects:
  • Biotic communities -- Bering Sea.,
  • Biotic communities -- Bering Sea -- Mathematical models.,
  • Marine mammals -- Bering Sea.,
  • Ecological assessment (Biology) -- Bering Sea.,
  • Whaling -- Environmental aspects -- Bering Sea.

  • Edition Notes

    Statementby Andrew W. Trites ... [et al.].
    SeriesFisheries Centre research reports -- v. 7, no. 1.
    ContributionsTrites, Andrew W., 1957-, University of British Columbia. Fisheries Centre.
    The Physical Object
    Pagination106 p. :
    Number of Pages106
    ID Numbers
    Open LibraryOL15998761M
    LC Control Number00009376

    In the Eastern Bering Sea both marine mammals and fishery had an overall negative impact on the entire ecosystem (MM = −; fishery = −). The groups that were mostly impacted by marine mammal consumption were deep-water fish, large flatfish and other demersal by: » Bering Sea Fishery Ecosystem Plan In December the North Pacific Council adopted a Bering Sea Fishery Ecosystem Plan (BS FEP). Fisheries Ecosystem Plans are a tool that can serve as a framework for continued incorporation of ecosystem goals and actions in regional management.

    The productive and ecologically diverse Bering Sea is economically and culturally important. Recent evidence of change in Bering Sea ecosystems has raised concerns and engendered research efforts by several agencies. One of these efforts is the Bering Ecosystem Study (BEST), which is supported by the National Science Foundation (NSF) Office of Polar Programs. Bering Ecosystem Study 08 Healy conducted sampling along a series of transects over the eastern Bering Sea. Research on the ship was multidisciplinary, with scientists using a variety of techniques to document ocean conditions and the productivity of the Bering Sea ecosystem. Raymond Sambrotto is the chief scientist on this Bering Sea.

    Administraon,’or’the’Naonal’Marine’Fisheries’Service.’ Title Identifying and Comparing Ecosystem Stressors in the Eastern Bering Sea and Gulf of Alaska, ZadorHolsman_AMSSpptx. of the Bering Sea (6, 7). A change from arctic to subarctic conditions is under way in the northern Bering Sea, with an attendant northward shift of the pelagic-dominated marine ecosystem that was previ-ously limited to the southeastern Bering Sea (8). The ice-dominated, shallow ecosystem favoring benthic communities and bottom-feeding seaCited by:


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Ecosystem change and the decline of marine mammals the eastern Bering Sea Download PDF EPUB FB2

Pauly. Ecosystem change and the decline of marine mammals in the Eastern Bering Sea: testing the ecosystem shift and commercial whaling hypotheses.

Fisheries Centre File Size: KB. Some species in the Bering Sea underwent large changes between the s and the s. Among the best documented are the declines of Steller sea lions and northern fur seals, and the possible increase and dominance of ground fish – pollock and large flatfish.

A frequently proposed explanation is that human exploitation of top predators and/or a shift in the physical oceanography altered the Cited by: Yet there have been significant unexplained population fluctuations in marine mammals and birds in the region.

The book examines the Bering Sea ecosystem's dynamics and the relationship between man and the ecosystem, in order to identify potential reasons for the population fluctuations as well as identify ways the Sea's living resources can be.

Yet there have been significant unexplained population fluctuations in marine mammals and birds in the region. The book examines the Bering Sea ecosystem's dynamics and the relationship between man and the ecosystem, in order to identify potential reasons for the population fluctuations as well as identify ways the Sea's living resources can be Format: Paperback.

Advances in Ecosystem Research: Saildrone Surveys of Oceanography, Fish, and Marine Mammals in the Bering Sea Article (PDF Available) in Oceanography (Washington D.C.) 30(2) June with Marine mammals are also major consumers of fish and other species in the Bering Sea ecosystem and may also have been impacted by climate shifts.

The number of new fur sea pups added to the population on St. Paul Island (in the Pribilof Islands) (bottom figure), shows a decrease after the s and another more recent decrease after The Bering Sea (Russian: Бе́рингово мо́ре, tr. Béringovo móre) is a marginal sea of the Pacific forms, along with the Bering Strait, the divide between the two largest landmasses on Earth: Eurasia and The Americas.

It comprises a deep water basin, which then rises through a narrow slope into the shallower water above the continental nates: 58°0′N °0′W / °N. The eastern Bering Sea shelf supports a diverse, abundant and highly productive marine biota.

It is home to a rich variety of biological resources, including the world's most extensive eelgrass. The eastern (EBS) and western (WBS) Bering Sea food webs have both benthic and pelagic components (Aydin et al. One of the most dominant fish species in the eastern Bering Sea that is subjected to commercial fishing is the walleye pollock (Theragra chalcogramma).This species is a central part of the pelagic food web of the eastern Bering Sea and juveniles are heavily preyed upon by.

Summary of biology and ecosystem dynamics in the Bering Sea Chapter PDF Available. January ; In book: Dynamics of the Bering Sea (pp) Abundance and trend of marine mammals in the. The situation is less clear in the Bering Sea, for which three relevant LMEs have been identified (Sherman, ): the eastern Bering Sea, the western Bering Sea, and the adjacent Gulf of Alaska.

In this scheme, the Bering Sea is divided by the shelf break and, in the north, by the international boundary; the "Gulf of Alaska" extends offshore.

Another ecosystem model constructed for the eastern Bering Sea examined trophic relationships to determine whether the declines of Steller sea lions and forage fishes (such as herring) and the increases in pollock (Pollachius spp.) and flatfish between the s and the s were related to the commercial removal of by: 5.

Ecosystem change and the decline of marine mammals in the Eastern Bering Sea: testing the ecosystem shift and commercial whaling hypothesis. Fisheries Centre Reports. The decline in numbers of some mammals and birds in the Bering Sea has not been easy to explain, and much less easy to influence (for more information, see NRC, ).

Cascading effects over the long term might explain some of the changes (see NRC, ), but only against the background of ecosystem response to the spectacularly variable. most species of concern in the Bering Sea are listed as vulnerable, and thus may not be at immediate risk of extinction, is cause for hope.

For many of these species, positive reforms in management could forestall further decline. Of the Bering Sea species of concern, 34 are birds, 21 are marine mammals and 11 are fish.

Birds of concern. sea biodiversity (Jones et al.Smith ). • A decline of sperm whales in the tropical and subtropical Pacific may have resulted in a shift toward ecosystems dominated by squids and tunas (Essington ). • Killer whales may have sequentially depleted marine mammal species in the Bering Sea (Springer et al.

).File Size: 5MB. Introducing the Bering Sea Collection, a body of educational resources focused on understanding the impacts of climate change and dynamic sea ice cover on the eastern Bering Sea ecosystem.

The Collection was developed during a four day workshop that brought together teachers who had traveled to the Bering Sea during teacher researcher experience programs; Bering Sea community teachers from. We evaluated the role of flatfishes in the organization and structure of the eastern Bering Sea ecosystem using the Ecopath/Ecosim approach.

As basic input data for the Ecopath/Ecosim model, we used estimates of biomass from bottom trawl surveys and age-structured population models, production/biomass (P/B) ratio, consumption/biomass (Q/B) ratio, diet composition (DC), and fisheries Cited by: 5.

And second, significant ecological effects of marine mammals are implied from their great abundance, high trophic status, high metabolic rates, and the resulting fact that some of these consumers co-opt significant proportions of their ecosystem's primary production (Estes et al., ).

Many marine mammal species have been depleted through Cited by: 6. Salmon feed on pollock, a species that is beginning to appear in larger numbers in the northern Bering Sea, possibly in response to warmer ocean temperatures. "What we are seeing," Grebmeier concluded, "is a change in the boundary between the sub-Arctic and the Arctic ecosystem.

As many of you know, some species of marine mammals and birds have been declining in the Bering Sea and some people believe that too much fishing is the cause of the declines. That is the topic of.decline in BKC stocks (Zheng and Kruse ). Given the recent change in flatfish distribution, future investigation would be beneficial and is listed as a future research priorities in this document.

5. In discussing recent trends in crab and the Bering Sea ecosystem, authors should recognize.Predation by Marine Mammals on Squids of the Eastern North Pacific Ocean and the Bering Sea CLIFFORD H. FISCUS Table Marine mammals oftheeastern North Pacific Ocean, Bering,and Chukchi Seas. Those known to preyon cephalopods are marked with an asterisk (').

(Names are aller Rice, ) in the northeastern Pacific Ocean eco­ system.