Salinity tolerance of the gemmules of Eunapius fragilis (Leidy) and the inhibition of germination by various salts |
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Authors: | Paul E Fell |
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Institution: | (1) School of Oceanography, WB-10, University of Washington, 98195 Seattle, Washington, USA;(2) Biology Department, Woods Hole Oceanographic Institution, 02543 Woods Hole, MA, USA |
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Abstract: | We report results of a field test of the predator avoidance hypothesis as an explanation of the adaptive significance of diel
vertical migration in zooplankton. We determined the vertical distribution and diel migration of the planktonic copepod Acartia hudsonica, concurrently with the abundance of pelagic fish, transparency and thermal stratification of the water column, on six cruises
over a one year period in a temperate marine lagoon (Jakles Lagoon, San Juan Island, Washington, USA). Striking seasonal variability
was observed in all biological and environmental variables. Linear regressions of the strength of diel vertical migration
in A. hudsonica on these environmental variables resulted in only one statistically significant relationship, that between copepod diel vertical
migration and predator abundance. These results, together with those of previous studies, point to diel vertical migration
as a widespread behavioral response of planktonic prey to the presence of their predators. |
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Keywords: | Diel vertical migration zooplankton predation planktivorous fish Gasterosteus aculeatus Acartia hudsonica |
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