UV-radiation can affect depth-zonation of Antarctic macroalgae |
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Authors: | K Bischof D Hanelt C Wiencke |
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Institution: | (1) Alfred Wegener Institute for Polar and Marine Research, D-27515 Bremerhaven, Germany, DE |
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Abstract: | Due to depletion of stratospheric ozone over polar regions of the Northern and Southern Hemispheres UV-B-radiation has increased
at the surface of the earth. Measurements of variable chlorophyll fluorescence were conducted to document UV-induced photoinhibition
of photosystem II in cultivated macroalgae with different depth distributions in Antarctica. The reactions during artificial
UV-exposure were observed on a short time scale (hours) and in light–dark cycles over several days. The nine species of investigated
macroalgae show great differences in UV-tolerance of the photosynthetic process. Photosynthesis of the studied green algae
was inhibited to a minor degree, while the brown algae showed an intermediate inhibition of photosynthesis. The response of
the studied red algae varied with species. The differences in the degree of inhibition and recovery of photosynthetic efficiency
and capacity indicate that UV-radiation is one important factor affecting the vertical distribution of macroalgae in nature.
Received: 11 December 1997 / Accepted: 27 March 1998 |
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