Diatom size distributions and community stratification in estuarine intertidal sediments |
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| Affiliation: | 1. Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences, ul. Favorskogo 1a, Irkutsk, 664033, Russia;2. Alfred Wegener Institute for Polar and Marine Research, Research Unit Potsdam, Bdg. A43, Telegrafenberg, Potsdam, 14473, Germany;3. Institute of Geological Sciences, Freie Universitaet Berlin, Bdg. D, Malteserstrasse 74-100, 12249, Germany;4. Institute of Archeology and Ethnography, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Lavrentieva 17, Novosibirsk, 630090, Russia;1. Institute of Diamond and Precious Metals Geology, Yakutsk Research Center, Siberian Division, Russian Academy of Sciences, 39 Lenina Avenue, Yakutsk, 677980, Sakha Republic (Yakutia), Russia;2. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, 39 East Beijing Road, Nanjing 210008, China;3. Consulting Geologist, 2821 Kingfisher Drive, Anchorage, AK 99502, USA |
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| Abstract: | The organization of an intertidal epipelic diatom community was quantified in terms of vertical cell-size distributions within soft sediments. Microgradients of grain and organic particle sizes, percentage of organics, porosity, light attenuation and oxygen distributions were measured over the top 5 mm of surface sediments. Epifluorescence microscopy and computerized planimetry showed that diatom cell size was bimodally distributed between very small and very large cells. The community was vertically stratified within the sediments with large numbers of small cells massed at the interface. Large cells were concentrated deeper in the microhabitat, far below light and oxygen penetration. Community organization was related to r-K selection theory, invertebrate herbivory and size-related adaptations of the diatoms. |
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