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 |
- A summary of
seabird bycatch from 1993-2004(.pdf, 407KB)
reports the estimated bycatch rates and numbers for select species groups
- Model Results: MSVPA MSM
-
Ecosystems Considerations SAFE Presentation to the SSC
(.ppt, 14.3MB)
- Final Ecosystem Considerations for 2006
(.pdf, 10MB) for the
North Pacific Groundfish Stock Assessment and Fishery Evaluation
Report
- Abundance, condition, and diet of juvenile Pacific ocean perch (Sebastes alutus) in the Aleutian Islands.
BOLDT, J. L., and C. N. ROOPER.
2009. Abundance, condition, and diet of juvenile Pacific ocean perch (Sebastes alutus) in the Aleutian Islands. Fish. Bull, U.S. 107:278-285. (.pdf, 634KB). Online.
- Determining spatial and temporal overlap of an endangered seabird with a large commercial trawl fishery.
ZADOR, S. G., J. K. PARRISH, A. E. PUNT, J. L. BURKE, and S. M. FITZGERALD.
2008. Determining spatial and temporal overlap of an endangered seabird with a large commercial trawl fishery. Endang. Species Res. 5:103-115. Online.
- Status review of the ribbon seal (Histriophoca fasciata).
BOVENG, P. L., J. L. BENGTSON, T. W. BUCKLEY, M. F. CAMERON, S. P. DAHLE, B. A. MEGREY, J. E. OVERLAND, and N. J. WILLIAMSON.
2008. Status review of the ribbon seal (Histriophoca fasciata). U.S. Dep. Commer., NOAA Tech. Memo. NMFS-AFSC-191, 115 p. (.pdf, 4.78 MB). Online.
- Fine-scale Analysis of Arrowtooth Flounder Catch Rates in the Eastern Bering Sea Reveals Spatial Trends in Abundance and Diet
By: STEPHANI ZADOR, KERIM AYDIN
Conference: Alaska Marine Science Symposium, Anchorage, AK, Jan 2009
(2009 poster, .pdf, 2.67MB) Online.
- Age, Growth, and Maturation of Sculpins in the Eastern Bering Sea and Aleutian Islands
By: TODD T. TENBRINK, KERIM Y. AYDIN
Conference: Alaska Marine Science Symposium, Anchorage, AK, Jan 2009
(2009 poster, .pdf, 774KB) Online.
- Research - Regulation - Operation, an Evaluation of the Effectiveness of Seabird Mitigation Requirements in the Alaskan Demersal Groundfish Longline Fleet
By: SHANNON FITZGERALD, RENOLD NARITA, KIM RIVERA
Conference: Pacific Seabird Group 35th Annual Meeting, Blaine, WA, Feb/Mar 2008
(2008 poster, .pdf, 4.07MB) Online.
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Fish Stomach Collection and Lab Analysis
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Alaska Marine Science Symposium Presentations
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Seabird Coordinated Studies
See the publications and poster databases for additional listings.
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