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We investigated biomass of zooplankton and micro-nekton using Norpac and bongo nets in the central Bering Sea in summer, 2007 to 2014 (except for 2010). We determined the biomass of zooplankton (including euphausiids, copepods, amphipods, decapods, chaetognaths, appendicularians, gastropods, hydrozoans, ostracods, and polychaetes) and micro-nekton (cephalopods, myctophids, and other fi shes) in the central Bering Sea. The mean biomass of total zooplankton collected with the Norpac net increased from 2007 to 2009, but fl uctuated from 2011 to 2014. Biomass of each prey category collected with bongo nets showed diff erent tendencies among years. There were negative correlations between integrated mean seawater temperature and biomass of zooplankton collected with both Norpac and bongo nets. The biomass of copepods, amphipods, and hydrozoans was signifi cantly lower in warm years. Other zooplankton categories (euphausiids, decapod larvae, ostracods, chaetognaths, and appendicularians) showed slightly negative or positive (polychaetes and gastropods) correlations with seawater temperature. These variations could not be explained by temperature changes alone. On the other hand, there was almost a constant correlation between integrated mean temperature and biomass of micro-nekton collected with bongo nets. The results of this study suggested that variation in zooplankton and micro-nekton biomass in the central Bering Sea may be aff ected by the seawater temperature.

Variation in Zooplankton and Micro-Nekton Biomass in Response to Seawater Temperature Changes in the Central Bering Sea during Summer