Recent Trends in Eastern Bering Sea Zooplankton: Data and Confessions J.M. Napp 1 , P.J. Stabeno 2 , D.V. Holliday 3 and G.L. Hunt, Jr. 4 1 NOAA – Fisheries, Alaska Fisheries Science Center 2 NOAA – Research, Pacific Marine Environmental Laboratory 3 University of Massachusetts, Dartmouth, School for Marine Science and Technology, and University of Rhode Island, Graduate School of Oceanography
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Recent Trends in Eastern Bering Sea Zooplankton: Data and Confessions
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Recent Trends in Eastern Bering Sea Zooplankton:
Data and Confessions
J.M. Napp1, P.J. Stabeno2, D.V. Holliday3 and G.L. Hunt, Jr.4
1NOAA – Fisheries, Alaska Fisheries Science Center2NOAA – Research, Pacific Marine Environmental Laboratory 3University of Massachusetts, Dartmouth, School for Marine Science and Technology, and University of Rhode Island, Graduate School of Oceanography4School of Aquatic and Fishery Sciences, University of Washington
Coyle et al. “Zooplankton species composition on the southeastern Bering Sea shelf during summer…”
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Napp et al., (2002) Deep-Sea Res., II
Spatial Variability in T/S Oshoro maru Sampling
Temporal Variability in T/S Oshoro maru Sampling
25th
Temporal Aliasing in Sampling
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iom
ass
(mg
m-3)
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Acoustically-Determined Zooplankton Biomass @ M2B
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lum
e (
mm
3 m
-3)
2006 2006
2007 2007
Conclusions
• Total zooplankton biomass appears to be “recovering” from the recent warm period.
• The abundance of Calanus marshallae over the middle shelf is an important contributor to that biomass, and it is also increasing.
• Present time series need to be strengthened, expanded and further tested for potential aliasing.– Retrospective analysis of T/S Oshoro maru species data.– Comparability among shipboard acoustics, moored
acoustics, net samples.
• Eastern Bering Sea zooplankton data are an excellent candidate metric for an aggregate index to explain ecosystem productivity.
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Acknowledgements
• Funding from NPRB (regular and BSIERP) and NOAA’s NPCREP Programs.