期刊
HYDROBIOLOGIA
卷 620, 期 -, 页码 163-172出版社
SPRINGER
DOI: 10.1007/s10750-008-9626-3
关键词
In situ measurements; Microphytobenthos; Intertidal community metabolism; Benthic primary production ~; Community respiration; PAM fluorometry
资金
- French National Programme on Coastal Ecology (PNEC)
In situ measurements of both community metabolism (primary production and respiration) and PAM fluorometry were conducted during emersion on intertidal sediments in the Mont Saint-Michel Bay, in areas where oysters and mussels were cultivated. Results highlighted a low benthic metabolism compared to other intertidal areas previously investigated with the same methods. Comparisons between gross community primary production and relative electron transport rates confirmed this statement. More specifically, primary productivity remained very low all over the year, whereas the associated microalgal biomass was estimated to be high. We suggest that the microphytobenthic community studied was characterized by a self-limitation of its primary productivity by its own biomass, as previously shown in Marennes-Ol,ron Bay for example. The almost permanent high biomass would represent a limiting factor for micromigration processes within the first millimetres of the sediment. This could be explained by very low resuspension processes occurring in the western part of the bay, enhanced by the occurrence of numerous aquaculture structures that could decrease tidal currents in the benthic boundary layer.
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