The meiobenthic community on the tidal flat of Miyajima in Hiroshima Bay, with special reference to the biomass of free-living nematodes

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  • 宮島干潟におけるメイオベントス動物群
  • 特に線虫類の現存量について

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Meiobenthos communities were surveyed to clarify the composition of animal groups and to estimate the production of major taxa inhabiting the tidal flat of coarse substrate at Miyajima (Itsukushima Island) in Hiroshima Bay. Nematoda formed the most major constituent of the meiobenthos in numerical abundance, accounting for 78% of the total miobenthos on the annual average. The density of Nematoda was highest in April at 2,620±888×103 indiv./m2, and lowest in October at 780 ±307×103 indiv./m2. Copepoda was the next most important taxon; its density was low from spring to summer and highest in October at 218±114×103 indiv./m2, showing converse seasonal pattern compared with Nematoda. Dry weight of Nematoda ranged on average from 0.32 µg/indiv. in December to 0.82 µg/indiv. in May. The biomass of Nematoda, calculated from the average dry weight and the density, peaked in May, and ranged 0.28~1.33g dry wt./m2 or 0.08~0.40gC/m2 during the study period. The production of Nematoda was estimated to be 44.3g dry wt./m2 · year or 13.5gC/m2 · year.

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