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.
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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.