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Geotaxis/phototaxis And Biochemical Patterns In Heterocapsa (=cachonina) Illdefina (dinophyceae) During Diel Vertical Migrations by Daniel Kamykowski; Edward J. Milligan; Robert E. Reed; Wenchen Liu is a Earth and Planetary Sciences article available to read on EtoBox.

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Two separate experiments with __Heterocapsa__ (=__Cachonina__) __illdefina__ Herman et Sweeney, one with and the other without water volume replacement, were performed in a 250‐L laboratory mesocosm (45‐cm diameter × 150‐cm height) to examine how diel vertical migration (DVM) relates to taxis sign and strength and to cellular biochemical state. Although only the cell population grown with water volume replacement maintained a division per day over the course of the experiment, periodic measurements during both experiments demonstrated that cells aggregating at the surface during the light period generally were deficient in all measured biochemical constituents compared to cells obtained from a midcolumn depth. More specifically, __H. illdefina__ cells that aggregated at the surface during the light period in both experiments exhibited weakened positive geotaxis but strengthened positive phototaxis and were very deficient in lipid and free amino acid compared to midcolumn cells. Cells sampled at midcolumn during the light period exhibited similar but weaker taxes changes compared to surface samples, and geotaxis strength was inversely correlated with cell diameter, cellular DNA and

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Author

Daniel Kamykowski; Edward J. Milligan; Robert E. Reed; Wenchen Liu

Publisher

John Wiley and Sons; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Wiley (ISSN 0022-3646)

Published

1999

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)