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Diel vertical migration of zooplankton at the S 1 biogeochemical mooring revealed from acoustic backscattering strength
Author(s) -
Inoue Ryuichiro,
Kitamura Minoru,
Fujiki Tetsuichi
Publication year - 2016
Publication title -
journal of geophysical research: oceans
Language(s) - English
Resource type - Journals
eISSN - 2169-9291
pISSN - 2169-9275
DOI - 10.1002/2015jc011352
Subject(s) - diel vertical migration , zooplankton , photic zone , oceanography , ocean gyre , mooring , environmental science , mesoscale meteorology , backscatter (email) , geology , atmospheric sciences , subtropics , nutrient , phytoplankton , biology , ecology , telecommunications , computer science , wireless
We examined the diel vertical migration of zooplankton by using the backscatter strength obtained from moored acoustic Doppler current profilers at mooring site S1 in the North Pacific subtropical gyre. There was seasonal variability in the vertical distribution and migration of the high‐backscatter layers in that they became deeper than the euphotic zone (<100 m) in winter and were confined above this depth in other seasons. Seasonal changes in daylight hours also affected the timing of the diel migration. We found that lunar cycles affected vertical distributions of zooplankton near the surface by changing the light intensity. Physical events, such as mixed‐layer deepening and restratification and the passage of a mesoscale eddy, also affected zooplankton behavior possibly by changing food environment in the euphotic zone. Since the comparison with net samples indicated that the backscatter likely represents the bulk biomass, the accuracy of biomass estimates based on net samples could be influenced by the high temporal variability of zooplankton distributions.