Journal
MARINE ECOLOGY PROGRESS SERIES
Volume 416, Issue -, Pages 165-178Publisher
INTER-RESEARCH
DOI: 10.3354/meps08754
Keywords
Habitat choice; Depth selection; Optical plankton counter; Generalized additive mixed model; GAMM; Calanus; Density-dependence; Seasonality
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Funding
- Norwegian Research Council [133904/120, 140290/140, 178434/S40]
- IPY project [76057/S30]
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Few studies have analysed the depth distribution of marine zooplankton at high-resolution, and knowledge obtained from theoretical modelling studies predominates over that from empirical field studies. We analysed depth selection by the marine copepod Calanus finmarchicus during spring and summer in neritic and oceanic Subarctic regions. Data on hydrography and zooplankton distribution in the upper 100 m were collected at high resolution by a towed instrument platform equipped with CTD, fluorometer and an optical plankton counter. Four extensive field data sets covering time windows from 3 to 11 d during the productive season were analysed using generalized additive mixed models. Our main findings were that: (1) mean depth of older development stages (CV and adults) of C. finmarchicus was best predicted by biotic factors (depth of the fluorescence maximum and population density), while abiotic factors (depth of the pycnocline) were of secondary importance, (2) depth selection was similar in neritic and oceanic areas, and (3) there was no evidence for synchronous diel vertical migration. Our results suggest that copepods dynamically and consistently select their habitat (depth) based on food conditions and predators in a density-dependent manner. We conclude that ecological interactions may drive habitat choice of planktonic organisms even in highly fluctuating oceanic environments.
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