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Resource Ecology and Ecosystem Modeling - Home

The Resource Ecology and Ecosystem Modeling Task at the Alaska Fisheries Science Center focuses on the collection and analysis of data relating to trophic interactions in the North Pacific and incorporation of these data into environmental assessments and single-species and multispecies models. Systematic collection and analysis of groundfish food habits data is performed. Data on size-at-age is integrated with bioenergetic information to estimate food consumption rates by fish populations. Information on marine mammal and bird diet is obtained from other Center programs or outside researchers. Quantifying food web linkages is essential to increase our understanding of how external forces such as fishing may cause unanticipated shifts in ecosystem composition. The importance of this research is also elevated given the increasing emphasis on fishery-mammal interactions: groundfish predation interactions are an important part of knowing the true nature of resource availability to mammals and birds.

Stomach samples are collected at virtually no cost to the program, utilizing fishery observers and existing assessment cruises for collection platforms. Samples are analyzed in the laboratory and entered into a food habits database. These data allow assessment of factors influencing individual species food habits, including interannual changes. Predation effects by groundfish populations are then quantified and incorporated into assessment models.



Recent Publications, Poster Presentations, Reports & Activities

  • Final Ecosystem Considerations (.pdf, 6.5MB) for the North Pacific Groundfish Stock Assessment and Fishery Evaluation Report - Updated for 2014
     
  • Estimation of bycatch in the unobserved Pacific halibut fishery off Alaska.
    TRIBUZIO, C. A., J. R. GASPER, and S. K. GAICHAS. 2014. Estimation of bycatch in the unobserved Pacific halibut fishery off Alaska. U.S. Dep. Commer., NOAA Tech. Memo. NMFS-AFSC-265, 506 p. (.pdf., 8 MB).  Online.
     
  • A preliminary mass-balance food web model of the eastern Chukchi Sea
    WHITEHOUSE, G. A. 2013. A preliminary mass-balance food web model of the eastern Chukchi Sea. U.S. Dep. Commer., NOAA Tech. Memo. NMFS-AFSC-262, 164 p. (.pdf, 1.2 MB).  Online.
     
  • Life-history aspects of the yellow Irish lord (Hemilepidotus jordani) in the Eastern Bering Sea and Aleutian Islands.
    TENBRINK, T. T., and T. W. BUCKLEY. 2013. Life-history aspects of the yellow Irish lord (Hemilepidotus jordani) in the Eastern Bering Sea and Aleutian Islands. Northwest. Nat. 94:126-136. 
     
  • Stomach Examiner’s Tool on Line: Preliminary Result
    By:  MEI-SUN YANG, GEOFF LANG, KIM SAWYER, CAROLINE ROBINSON, RICK HIBPSHMAN, SEAN ROHAN
    Conference:  Western Groundfish Conference (18th), Victoria, B.C., Feb 2014
    (2014 poster, .pdf, 475 KB)   Online.

     
  • Climate Change Impacts on Predator-prey Dynamics in the Bering Sea: Changes to Foraging Rate and Prey Demand of Walleye Pollock, Pacific Cod, and Arrowtooth Flounder
    By:  KIRSTIN K. HOLSMAN, KERIM AYDIN
    Conference:  Alaska Marine Science Symposium, Anchorage, AK, Jan 2014
    (2014 poster, .pdf, 1.35 MB)   Online.

     
  • An Updated Trophic Model of the Eastern Chukchi Sea
    By:  G. ANDY WHITEHOUSE, KERIM AYDIN
    Conference:  Alaska Marine Science Symposium, Anchorage, AK, Jan 2014
    (2014 poster, .pdf, 3.27 MB)   Online.

     
  • Fish Stomach Collection and Lab Analysis

  • Seabird Research

  • Bering Sea Project Open Science Meeting/ASLO Ocean Science Meeting

  • National Ecosystem Modeling Workshop

  • Scientific and Statistical Committee Workshop


See the publications and poster databases for additional listings.

 

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