Abstract
The spatial variations of meiofauna population density and the assemblage of free-living marine nematodes in areas with Avicennia marina and Rhizophora apiculata cover of Pichavaram and Parangipettai (southeast coast of India) are described. Seven meiofauna taxa were recorded, with maximum density of meiofauna (890 ind. 10 cm −2) being recorded in an area with A. marina cover. Nematodes accounted for up to 93.1% of the total densities; other common taxa were foraminifera and polychaeta. A total of 44 species of nematodes belonging to 36 genera and 20 families were recorded. Of these, 37 species belonging to 30 genera and 17 families were recorded from Pichavaram mangrove and 14 species belonging to 10 families from a nearby artificial mangrove environment. While 16 species were common to both A. marina and R. apiculata cover, 15 species were restricted to areas with A. marina cover and 13 to areas with R. apiculata cover. Dorylaimopsis sp. was the abundant genera in areas with A. marina cover and Daptonema sp. in areas with R. apiculata cover. Only three species were common in all the five stations. Epistrate-feeders were the most abundant nematodes in areas with A. marina cover and deposit-feeders/ciliate feeders in areas with R. apiculata cover.
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