Regulation of Intertidal Microphytobenthos Photosynthesis Over a Diel Emersion Period Is Strongly Affected by Diatom Migration Patterns.
作者： Paulo Cartaxana , Sónia Cruz , Carla Gameiro , Michael Kühl
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摘要: Changes in biomass and photosynthesis of a diatom-dominated microphytobenthos (MPB) intertidal community were studied over diel emersion period using combination O2 scalar irradiance microprofiling, variable chlorophyll (Chl) fluorescence, pigment analysis. The MPB the photic zone (0–0.5 mm) sediment exposed to low (150 μmol photons m–2 s–1) showed >2-fold increase during first hours period, reaching >0.2 mg Chl cm-3. Concentrations started decrease half-way through almost 2 h before tidal inundation. Similarly, concentrations volumetric gross increased half then decreased towards timing incoming tide/darkness. results suggest that community-level is mainly controlled by changes productive determined cell migration. A pattern vs. parameters α (photosynthetic efficiency at limiting irradiance) ETRmax capacity saturating was also observed, suggesting photoacclimation photosynthesis. Under high light exposure (2000 s–1), lower α, observed when migration inhibited with diatom motility inhibitor latrunculin (Lat A), showing used maximize reducing potentially photoinhibitory levels. higher de-epoxidation state treated Lat indicates involvement xanthophyll cycle physiological photoprotection more relevant cells are from migrating. In community, seems be key factor regulating upon exposure.
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