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Laboratory experiments on the diurnal vertical migration of marine dinoflagellates through temperature gradients



Laboratory experiments on the diurnal vertical migration of marine dinoflagellates through temperature gradients



Marine Biology 62(1): 57-64



The diurnal vertical migrations of 4 marine dinoflagellates (Cachonina niei, Ceratium furca, Gymnodinium splendens and Prorocentrum micans) were studied in a thermally-stratified Plexiglas column (1.70 m deep, 0.61 m diameter). All species migrated through temperature gradients exceeding 7.degree. C. Some species exhibited altered migration patterns at different salinities either between experiments or compared to observations by other investigators. P. micans exhibited complex changes in swimming speed that depended both on temperature and on the light cycle. These changes provide insight into the possible time course of a field organism's diurnal exposure to physical variability in the water column. P. micans exhibited compositional changes in response to the light cycle but not to the cross-thermocline temperature differential. A multi-parameter response matrix is required to model coupling between organisms and biologically- active physical mechanisms realistically.

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Accession: 005787894

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DOI: 10.1007/bf00396951


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