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Title Transcription
シンジコ スイケイ ニ オケル ヤマト シジミ コタイ グン ブンプ ノ チョウキテキ ヘンドウ
Title Alternative (English)
Long-term fluctuation of the brackish-water bivalve Corbicula japonica population in the coastal waters of Lake Shinji, western Japan
File
language
jpn
Author
Moriwaki, Shimpei
Description
The distribution and population density of the brackish-water bivalve, Corbicula japonica, in the coastal waters of Lake Shinji were summarized from the literature. It is thought that the primary habitat of C.japonica was limited to the vicinity of the Oohashi River before the early Showa era. Population density was relatively low, slightly less than 1,000inds./m^2 from 1930 to 1960. After that, the population density of C. japonica began to increase starting in the mid-1960 s and rose to its highest level-10,000~20,000 inds./m^2-in the 1980 s. The increase of C.japonica coincides with a significant increase in chl-a, implying the development of better food resources for C. japonica. On the other hand, the area inhabited narrowed to the lake shore shelf. Although a large die-off of C. japonica occurred in the autumn of 1997, the population density of C. japonica has recovered rapidly, i.e. the population has maintained a density of 5,000-10,000 inds./m^2 since 1999.
Subject
Corbicula japonica
Lake Shinji
population density
Journal Title
Laguna : 汽水域研究
Volume
11
Start Page
31
End Page
41
ISSN
21852995
Published Date
2004-06
NCID
AN10439529
Publisher
島根大学汽水域研究センター
NII Type
Departmental Bulletin Paper
Format
PDF
Text Version
出版社版
OAI-PMH Set
Estuary Research Center
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