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Aleutian Pribilof Energy Summit..........2 St. George & Nelson Lagoon EDA Projects ..........................4 June 2010 Scholarship Requirement Changes...8 Aleutian Aleutian HAGINAA KIDUL • HELPING TO GROW wave The Bering Sea Project: What is happening to pollock? Posted on behalf of Wendee Holtcamp, blogging for Nature aboard the research vessel Thomas G. Thompson This article first appeared in Nature.com and is re- printed with permission from Seafood.com. We think this information and project is important. The Bering Sea and its ecosystem is very complex and undoubt- edly undergoing change. This article provides some information that you may find helpful in understanding these dynamics. - Larry Cotter Good news! After a couple of days of bending metal, the crew fixed the Multi-Core and the mud team is once again collecting sediment as we continue traversing transects in the Bering Sea. The fish team also seem excited. Their keenness is due to the ‘NP’ (Nunivak-to-Pribilof) transect line we just started and the fact that last year they caught more pollock here than anywhere else. “So far we haven’t found many fish this year,” University of Alaska doctoral student Elizabeth Siddon told me. What is happening with pollock is a question Sid- don’s research hopes to address. She will use fish collected from this project to study how envi- ronmental variability – including salinity, tempera- ture, and zooplankton abundance – influences the fish community composition in the Bering Sea. What makes young pollock more and less abundant and what explains the current decline in pollock numbers? Scientists divide the Bering Sea into three domains: coastal, middle, and outer, all on the continental shelf. A long finger of water that stays less than 2 degrees C on the ocean floor – the “cold pool” – characterizes the middle domain. It reaches further south on cold years, forcing many organisms to avoid it. Winter sea ice extent reached a 30-year high in 2008, and the trend continued in 2009 and 2010. This causes a large cold pool when the ice melts, and the cold spell may be causing low larval fish catches in the MOCNESS (Multiple Opening/ Closing Net and Environmental Sampling System). Between 2000 through 2005, average Bering Sea temperature was unusually high. The extreme fluc- tuations created a good scenario in which to test the Oscillating Control Hypothesis (OCH), a broad framework for understanding the complex food web of the Bering Sea. Originally developed to under- stand what drives pollock production, the hypothesis also makes predictions about everything from ben- thic invertebrates to seabirds. It works like this: In cold years, sea ice melts late, when ample daylight spurs algal growth at the edge of the melting ice. Algae thrive in the icemelt layer, which has lower salinity. Story continued on page 3PDF Image | The Bering Sea Project
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