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Phytoplancton, tripton et microphytobenthos: échanges au cours de la marée, dans un estuaire du Nord-Finistère = Phytoplankton tripton and microphytobenthos: exchanges during the tidal cycle in a North-Finistere (Brittany) estuary
Riaux-Gobin, C. (1987). Phytoplancton, tripton et microphytobenthos: échanges au cours de la marée, dans un estuaire du Nord-Finistère = Phytoplankton tripton and microphytobenthos: exchanges during the tidal cycle in a North-Finistere (Brittany) estuary. Cah. Biol. Mar. 28(2): 159-184
In: Cahiers de Biologie Marine. Station Biologique de Roscoff: Paris. ISSN 0007-9723, more
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Keyword
    Marine

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  • Riaux-Gobin, C.

Abstract
    In order to study the fluxes of particulate matter in an estuary with a large tidal range (mouth of the Dourduff river, Northern Brittany) samples for chlorophyll a, phaeopigments and seston were taken simultaneously with hydrological parameters at a fixed station, during tidal cycles and at different seasons. Seston, chl. a and phaeo. showed a maximum at slack water, low tide. The level, and moreover, the duration of the peak differs with the tidal amplitude and the season. During spring tides the maximum chl. a concentration may be 30 times higher than that at high tide. The "chl. a/seston" and the "chl. a/phaeo." ratios are minimal during this peak, indicating the high percentage of detrital particles. Phytoplanktonic algae are scarce at low tide, whereas microphytobenthic pennate diatoms are abundant, whatever the season, indicating resuspension as main source of the peak.

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