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尾瀬沼深底部の底生動物群集 : 1986年と2018年の比較

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Title: 尾瀬沼深底部の底生動物群集 : 1986年と2018年の比較
Other Titles: Composition and abundance of macrozoobenthos in the profundal zone of Lake Ozenuma, central Japan, with special reference to structural difference between 1986 and 2018 surveys
Authors: 大高, 明史1 Browse this author
木村, 直哉2 Browse this author
Authors(alt): Ohtaka, Akifumi1
Kimura, Naoya2
Keywords: 尾瀬沼
Lake Ozenuma
profundal zone
long-term change
Issue Date: 31-Mar-2022
Publisher: 低温科学第80巻編集委員会
Journal Title: 低温科学
Journal Title(alt): Low Temperature Science
Volume: 80
Start Page: 439
End Page: 444
Abstract: 2018年に尾瀬沼深底部で底生動物の構成と現存量を調べた.大型底生動物群集は,貧毛綱3種,ユスリカ科2種,フサカ科1種の計6種からなり,貧毛綱ミズミミズ科のユリミミズが優占した.同じ地点で1986年に行った調査ではイトミミズが優占していたことから,この間にイトミミズからユリミミズへの優占種の交代が起こったことが示唆される.これには,近年の湖底温度の上昇が関係している可能性がある.
Composition and abundance of macrozoobenthos were studied in the profundal bottoms of Lake Ozenuma in 2018. Six species of macrozoobenthos consisting of three oligochaetes, two chironomids and one chaoborid were recorded from the study sites, of which a tubificine oligochaete, Limnodrilus hoffmeisteri dominated. Compared with past benthological records in Lake Ozenuma in 1986, Limnodrilus hoffmeisteri increased, while those of another tubificine Tubifex tubifex decreased in the present study. The change in the oligochaete structure could be caused by increase of bottom temperature in recent years.
Type: bulletin (article)
Appears in Collections:低温科学 = Low Temperature Science > 第80巻

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