Ecological study of the seagrass meadows in Nagura Bay Ishigaki Island Okinawa:I. Ecological distribution of seagrass

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The flora and ecological distributions of tropical seagrasses were investigated in Nagura Bay, Ishigaki Island, okinawa. Seagrass meadows in the Bay are developed along the coast, their areal extensions wide at the inner part and narrow at the outer part of the bay. Six genera, eight species of seagrasses, Zostera japonica, Halodule uninervis, H. pinifolia, Syringodium isoetifolium, Cymodocea rotundata, C. serrulata, Thalassia hemprichii, and Halophila ovalis are found there. Ecological distribution of seagrasses are analyzed for their habitat utilization, mainly from the view point of vertical range, horizontal situation in the bay, areal extent of distribution and dominance in biomass. Thalassia hemprichii is the most common species in upper sublittoral zone and becomes dominant at various habitat situations. Though there are some degree of overlap, species pairs of Halodule and Cymodocea exhibit considerable difference in habitat utilization within each congeneric species pair. Zostera japonica, Syringodium isoetifolium and Halophila ovalis grow at limited habitat conditions, respectively. Several species jointly appeard in most sampling localities, three types of associations such as Halodule pinifolia-Halophila ovalis association, T.hemprichii-C. rotundata association and T.hemp-richii-C. serrulata association, are recognized.
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