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Photosynthetic Rates and Photoinhibition of Surf Diatoms in Fluctuating Light by E. E. Campbell; D. R. du Preez; G. C. Bate is a Earth and Planetary Sciences article available to read on EtoBox.

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Cells of the surf diatom, Anaulus birostratus are exposed to a fluctuating light environment as a result of their being brought to the water surface by attachment to bubbles and their return to the water column by passing wave bores. Fluctuating light did not alter the rate of photosynthesis in Anaulus birostratus, either on a short (10 minute) or long (4 hour) time scale. The photosynthetic rate of an algal cell moving up and down in the water column should be calculated as the mean of the photosynthetic rate at the surface and that at the bottom rather than as the photosynthetic rate at the mean irradiance received. Photoinhibition was found to be entirely quantum dose dependent with regard to the time required for photoinhibition to occur. Photoinhibition levels were the same after exposure to constant or fluctuating light fields. This has certain implications for the estimation of surf-zone primary production. Three daily periods of photosynthesis can be identified as: 1) photoinduction phase, 2) P max phase, and 3) photoinhibition phase. Fluctuating irradiance has no effect on the photoinduction or P max phases. In the photoinhibition phase, absorbed quanta rather than maximum

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Author

E. E. Campbell; D. R. du Preez; G. C. Bate

Published

1988

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)