アマモ葉上のメイオベントス群集, 特に自由生活線虫類を中心に(予報)

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  • Phytal meiobenthos community on the eelgrass (Zosteya marina L.) leaves, with reference to free-living nematodes (Preliminary report)

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Phytal meiobenthos on eelgrass leaves was investigated in Amakusa, west Kyushu. Seasonal variation of nematode community was studied, especially on species composition, total nematode density and feeding type composition. The top rank taxon in the phytal meiobenthos was Harpacticoids and nematodes came the second throughout the year, while in April nematode became the top rank by sudden increase of a few dominant species. Total nematode density reached annual maximum in April, then decreased to low density in June, again increased and made small second peak in August. This seasonal fluctuation pattern is much similar with that of epiphyte biomass. The increase of epiphyte biomass seemed to contribute nematode abundance through increase of habitat complexity in micro-scale and food resource. In the feeding type analysis by WIESER'S buccal morphology criteria, the epigrowth feeder was the most dominant type throughout the year, except February, when the non-selective deposit feeder increased and took over the top rank. The characteristics of nematode communities of phytal and sediment layer in the eelgrass bed was briefly compared.

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