相模湾北部と東京湾西部の河口域に生息するカニ類の種類と生態について

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The inquiries have been made, at an interval of about twenty years, into the ranges of the brachyuran crabs found in the estuaries of norhtern Sagami and eastern Tokyo Bays. The first investigations were made mainly during the summer of 1952 and the winter of 1955 by GAMO (1965), and the second researches were made in exactly the same manner by KOSAKAI, during the summer in 1975. The crabs were found in great numbers and enumerated about thirty species in the first report. In contrast with the first, only a small numbers of crabs, about sixteen species were enumerated and their ranges were also strongly limited in the second observations. The poverty of the crabs and their restricted ranges may be attributed to the following inhibiters such as, water pollution, urbanization and embankment made of concrete, these have been rapidly proceeded during the past twenty years. In general, only a few number of species may be found in the river mouth of the torrential rivers such as, Hayakawa and Sagamigawa. In the estuaries of the slowly flowing rivers such as, Sakaigawa and Arakawa, some marine crabs may be seen together with the estuarine crabs. Some of the estuarine crabs such as, Sesarma and its relatives, their habitat extends towards the swamps and marshes and further into the lands and the hills about 60-80m high near the river, and Eriocheir japonicus penetrates throuth the upper freshwater regions of the river and spreads far and wide into the small streams and creeks.
横浜国立大学の論文
1991-03-25

相模湾北部と東京湾西部の河口域に生息するカニ類の種類と生態について

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