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The Trophic Role of Euphausiids: Ecosystem Responses to Changing Sea-Ice Conditions

The Trophic Role of Euphausiids: Ecosystem Responses to Changing Sea-Ice Conditions Rodger Harvey - University of Maryland, Chesapeake Biological Laboratory Evelyn Lessard - Dept. of Oceanography, University of Washington Collaborators Alexi Pinchuk (UA Fairbanks) Se-Jong Ju (KORDI)

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The Trophic Role of Euphausiids: Ecosystem Responses to Changing Sea-Ice Conditions

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  1. The Trophic Role of Euphausiids: Ecosystem Responses to Changing Sea-Ice Conditions Rodger Harvey - University of Maryland, Chesapeake Biological Laboratory Evelyn Lessard - Dept. of Oceanography, University of Washington Collaborators Alexi Pinchuk (UA Fairbanks) Se-Jong Ju (KORDI) Central Hypothesis: Seasonal and interannual variation in the timing and coverage of sea-ice and associated food resources will lead to differences in age structure, diet history and nutritional condition for euphausiids. These ultimately translate into differences in production rates and their availability to higher trophic levels.

  2. What we plan to do: Potential Prey Copepods and nauplii, protists, phytoplankton, detritus, ice algae Animal collections in ice and open water Biochemical Age estimation Lipid Biomarkers Shipboard Feeding Experiments HPLC lipofuscins GC & GC-MS Culture prey Calibration (rearing) Diet History & Nutritional Status Growth Rate and Egg Production Demographic structure Links to Higher Trophics ?

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