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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
     
  • A trophic mass balance model of the eastern Chukchi Sea with comparisons to other high-latitude systems.
    WHITEHOUSE, G. A., K. AYDIN, T. E. ESSINGTON, and G. L. HUNT, Jr. 2014. A trophic mass balance model of the eastern Chukchi Sea with comparisons to other high-latitude systems. Polar Biol. 37:911-939.  
     
  • 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.
     
  • Comparing Laboratory and at-Sea Analysis of Stomach Contents in Alaska
    By:  TROY W. BUCKLEY, RICHARD E. HIBPSHMAN, KIRSTIN K. HOLSMAN, MICHAEL F. CANINO, MELANIE M. PAQUIN, GEOFFREY M. LANG
    Conference:  American Fisheries Society, 144th Annual Meeting, Quebec, Canada, Aug 2014
    (2014 poster, .pdf, 2.13 MB)   Online.

     
  • Digital Images: a Stomach Examiner’s Tool Online
    By:  MEI-SUN YANG, GEOFF LANG, TROY BUCKLEY, RICK HIBPSHMAN, KIM SAWYER, CAROLINE ROBINSON, SEAN ROHAN
    Conference:  American Fisheries Society, 144th Annual Meeting, Quebec, Canada, Aug 2014
    (2014 poster, .pdf, 4.86 MB)   Online.

     
  • Latitudinal and Ontogenetic Shifts in the Diet of Arctic Cod (Boreogadus saida) in the Pacific Arctic and Bering Sea
    By:  TROY W. BUCKLEY, G. ANDREW WHITEHOUSE, KIMBERLY A. SAWYER, CAROLINE L. ROBINSON
    Conference:  American Fisheries Society, 144th Annual Meeting, Quebec, Canada, Aug 2014
    (2014 poster, .pdf, 1.63 MB)   Online.

     
  • Fish Stomach Collection and Lab Analysis

  • Congressional Briefing (re: stock assessments)

  • BSIERP FEAST 6-Year Project Wrap-Up and Future Work

  • The Norway-United States Climate Change and Marine Ecosystems (NUCCME) Workshop

  • Arctic Ecosystem Integrated Survey PI Meeting


See the publications and poster databases for additional listings.

 

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