DISTINCT FEEDING STRATEGIES IN TWO SPECIES OF BERING SEA EUPHAUSIIDS DOCUMENTED BY MULTIPLE LIPID BIOMARKERS
Euphausiids are an instrumental link in the eastern Bering Sea food web. Two prominent species of euphausiids with differing habitat preferences are found in the region – Thysanoessa inermis and Thysanoessa raschii – and both also exhibit different metabolic and dietary strategies. As part of the Bering Sea Ecosystem Study (BEST), euphausiids, water column particles, and sediment samples were collected throughout the eastern Bering Sea during spring and summer from 2008-2010. Shipboard incubations show T. inermis can survive starvation for over two months and rely on much larger lipid stores in the form of wax esters (10-18% of their total lipid), than their counterparts, which utilize a different storage lipid (triacylglycerols) and maintain smaller reserves (1-5% of total lipid). Hydrocarbons specific to sediments and absent from particles reflect detrital feeding at the sediment surface by the neritic species T. raschii, which can also provide a mechanism for their winter survival. T. inermis, the more oceanic of the species common to deeper waters, lacks the presence of these detrital markers of sediment feeding.
Pleuthner, R. L., Old Dominion University, OEAS, USA, firstname.lastname@example.org
Harvey, H. R., Old Dominion University, OEAS, USA, email@example.com
Time: 16:00 - 18:00
Location: Poster/Exhibit Hall
Presentation is given by student: Yes