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Caracteristiques du microphytobenthos d'un lac volcanique meromictique (Lac Pavin, France). I. Biomasse chlorophyllienne et déterminisme du cycle annuel
Author(s) -
Romagoux JeanClaude
Publication year - 1979
Publication title -
internationale revue der gesamten hydrobiologie und hydrographie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.524
H-Index - 52
eISSN - 1522-2632
pISSN - 0020-9309
DOI - 10.1002/iroh.19790640303
Subject(s) - sedimentation , sediment , biomass (ecology) , benthos , phytoplankton , algae , silt , environmental science , ecology , environmental chemistry , oceanography , geology , biology , chemistry , geomorphology , nutrient , benthic zone
Characterization of the Microphytobenthos in a Volcanic Meromictic Lake (Lake Pavin, France). I. Chorophyll Biomass and Determination of the Annual Cycle The sediments in Lake Pavin are almost exclusively biogen. The fine fraction (≤ 40 μm). comprises 99% of these sediments, making them appear as very fine and fluid silt. Up to 85% of the microphytobenthos is composed of epipelic Bacillariophyceae. The benthos at the different depths studied (10 m, 20 m, 30 m, 40 m, 50 m, and 60 m). are colonized by characteristic populations of diatoms. Analyses of the sediments revealed high concentrations of pigments ( ≥ 1 mg/g dried sediment). Such high concentrations usually result from phytoplankton sedimentation. The deepest area of the lake, as expected, contains the highest concentation of accumulated pigment, while shallower locations are richer in active pigments.