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The diel migrations and distributions within a mesopelagic community in the northeast atlantic 3. planktonic ostracods a stable component in the community


, : The diel migrations and distributions within a mesopelagic community in the northeast atlantic 3. planktonic ostracods a stable component in the community. Progress in Oceanography 13(3-4): 319-352

Some 155,000 specimens of 27 spp. of planktonic ostracods were identified from the 96 hauls of the four 48 h repeat series of samples collected at depths of 100m, 250m, 450m, and 600m. Relatively little diel migration was observed, but in other seasons once the spring bloom abates a greater level of migratory activity is expected. There was evidence of the ontogenetic development of migratory behavior in some species. The samples each of which involved the filtration of around 2800 m3 of water gave very consistent data. Standard deviations of the mean densities of non-migratory species were frequently as low as 30% of the mean values, indicating that single observations are within a factor of 3 or so of the mean densities. The majority of species or instars in which the standard deviations were > 50% of the means showed clear cycles of variability that related to the light cycle and hence to diel migratory behavior. Neither factor analysis nor rank correlation analysis of the 450 m and 600 m series showed any major changes in the community structure resulting from diel migration.

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