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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. 
     
  • Designing and Implementing Annual Catch Limits for North Pacific Groundfish and Crab Stocks
    By:  PAT LIVINGSTON, GRANT THOMPSON, JACK TURNOCK, KERIM AYDIN, LIZ CONNERS, PAUL SPENCER, OLAV ORMSETH
    Conference:  Managing Our Nation's Fisheries 3 Conference, Washington, D.C., May 2013
    (2013 poster, .pdf, 2.21 MB)   Online.

     
  • Estimates of Seabird Bycatch in Alaskan Groundfish Fisheries Using the Alaska Region Catch Accounting System, 2007-2011
    By:  SHANNON M. FITZGERALD, JENNIFER CAHALAN, JASON GASPER, JENNIFER MONDRAGON
    Conference:  Pacific Seabird Group 40th Annual Meeting, Portland, OR, Feb 2013
    (2013 poster, .pdf, 766 KB)   Online.

     
  • FEAST Forage and Euphausiid Abundance in Space and Time Assumptions, Knowledge and Gaps
    By:  IVONNE ORTIZ, KERIM AYDIN, AL HERMANN
    Conference:  Alaska Marine Science Symposium, Anchorage, AK, Jan 2013
    (2013 poster, .pdf, 5.4 MB)   Online.

     
  • Fish Stomach Collection and Lab Analysis

  • Ecosystem Modeling (FEAST, oceanography and zooplankton dynamics)

  • Seabird Bycatch Estimates for Alaskan Groundfish Fisheries, 1993-2012


See the publications and poster databases for additional listings.

 

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