• Login
    View Item 
    •   Home
    • University of Alaska Fairbanks
    • UAF Graduate School
    • College of Fisheries and Ocean Sciences
    • View Item
    •   Home
    • University of Alaska Fairbanks
    • UAF Graduate School
    • College of Fisheries and Ocean Sciences
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of Scholarworks@UACommunitiesPublication DateAuthorsTitlesSubjectsTypeThis CollectionPublication DateAuthorsTitlesSubjectsType

    My Account

    Login

    First Time Submitters, Register Here

    Register

    Statistics

    Display statistics

    Seasonal sea ice, the cold pool and gadid distribution on the Bering Sea shelf

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Thumbnail
    Name:
    Wyllie_Echeverria_T_1995.pdf
    Size:
    4.663Mb
    Format:
    PDF
    Download
    Author
    Wyllie-Echeverria, Tina
    Chair
    Norcross, Brenda L.
    Wooster, Warren S.
    Keyword
    Biological oceanography
    Aquatic sciences
    Metadata
    Show full item record
    URI
    http://hdl.handle.net/11122/9457
    Abstract
    The variability in winter seasonal sea ice cover, its impact on the summer hydrography of the Bering Sea shelf, and the consequences to the demersal distributional patterns of walleye pollock (Theragra chalcogramma) and Arctic cod (Boreogadus saida) were investigated. Winter ice conditions acquired by remote sensing techniques were compared to the following summer's hydrographic conditions and fish distributions acquired from fisheries surveys between 1972-1993. Linkages among atmospheric, oceanic, and biological interactions occurred on two scales, an interannual mode of warm or cold conditions and multi-annual regimes of warm, cold or mixed conditions. The southernmost extent of sea ice as measured along meridian 169$\sp\circ$W (P$\sb{\rm S}$) can be used to identify warm or cold conditions on the shelf. Warm conditions occurred when P$\sb{\rm S}$ extended southward, between 60$\sp\circ$-$57\sp\circ30\sp\prime$N, bottom temperatures were 3.8$\sp\circ$-4.6$\sp\circ$C and the subsurface cold pool of water extended eastward, between meridians 170$\sp\circ$-166$\sp\circ$W. Cold conditions occurred when P$\sb{\rm S}$ extended southward, between $57\sp\circ30\sp\prime$-56$\sp\circ$N, bottom temperatures were 1.2$\sp\circ$-3.0$\sp\circ$C and the subsurface cold pool of water extended eastward, between meridians 163$\sp\circ$-158$\sp\circ$W. During the 20 year time series of climatic conditions, three regimes occurred: a cold regime prevailed from 1972-1977, a warm regime from 1978-1984, and a mixed regime from 1985-1991. Age-1 and age-2 and older walleye pollock were primarily in the outer domain during cold conditions and in the middle and inner domain during warmer conditions. Arctic cod were present during cold conditions. Shifts in distribution of these species have ecosystem-wide consequences and can occur on either interannual scales or on the time-scale of regime shifts. Changes in the level of piscivorous predation on age-1 pollock, including cannibalism, occurred on the annual scale while prey species of seabirds and marine mammals fluctuated on the regime scale. Warm or cold summertime conditions were predictable from the previous winter's ice extent, which provides basic information on the level of environmental variability that affects biological systems and can be utilized in modeling this system. The results predict that older pollock will be concentrated in the outer domain following winters with extensive ice, information which could be useful to the fishing industry.
    Description
    Dissertation (Ph.D.) University of Alaska Fairbanks, 1995
    Date
    1995
    Type
    Dissertation
    Collections
    College of Fisheries and Ocean Sciences
    Theses (Unassigned)

    entitlement

     
    ABOUT US|HELP|BROWSE|ADVANCED SEARCH

    The University of Alaska Fairbanks is an affirmative action/equal opportunity employer and educational institution and is a part of the University of Alaska system.

    ©UAF 2013 - 2023 | Questions? ua-scholarworks@alaska.edu | Last modified: September 25, 2019

    Open Repository is a service operated by 
    Atmire NV
     

    Export search results

    The export option will allow you to export the current search results of the entered query to a file. Different formats are available for download. To export the items, click on the button corresponding with the preferred download format.

    By default, clicking on the export buttons will result in a download of the allowed maximum amount of items.

    To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export. The amount of items that can be exported at once is similarly restricted as the full export.

    After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format.