畠島海岸生物相の長期的変化とその要因

概要

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Literature on the recent changes in the coastal biota of Hatakejima Island (33°41′N, 135°22′E) was reviewed and possible causes of the changes were explored. Six hundred and twenty one species of animals and plants have been recorded on this island's seashore. Three quarters of them are invertebrates. The coastal biota has prominently changed in the last three decades ; 64 species (>10% of all) increased or decreased conspicuonsly. The number of decreasing species was 5 times greater than that of the increasing ones. The decline in number of species was more obvious in molluscs and echinoderms than crustaceans. Water pollution seems to be an important cause of the observed changes. Oligotrophic species decreased and eutrophic species increased. Several species have disappeared only from the bay-head side of the island where pollution has been serious. Some circumstantial evidence suggests that the changes are also due to low temperatures in winter and harvesting of edible species by local people.
日本生態学会の論文
1989-04-30