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2022-12-15T03:56:26Z
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自然酸性河川における水生昆虫の現存量 : 長野県須高地方,松川及び米子川の例
自然酸性河川における水生昆虫の現存量 : 長野県須高地方,松川及び米子川の例
Standing Stock of Aquatic Insects in Naturally Acidified River, Rivers Matsukawa and Yonagogawa in Sudaka District, Nagano, Japan
福原, 晴夫
古木, 真理華
酸性河川
水生昆虫
現存量
好酸性種
Protonemura
Rhyacophila
酸性化
acidified river
aquatic insect
standing stock
acidbiontic species
Protonemura
Rhyacophila
acidification
Acidification of inland waters, lakes and rivers, has been largely influenced on aquatic organisms at sensitive regions in Europe, Canada and North America. To analysis the effects of acidification on aquatic organisms in Japan, the relationships between pH gradient and standing stocks of aquatic organisms, mainly aquatic insects, were investigated using naturally acidified rivers including neutral tributaries. River water of Matsukawa and Yonagogawa and their tributaries in Sudaka district of Nagano Prefecture, containing various concentrations of SO_4^<2-> showed the pH spectrum from 2.8 to 6.4 at 16 sampling sites. Very low biomass of aquatic invertebrates was measured in acidic sites below pH 4.5, whereas high concentration of chlorophyll-a and invertebrate biomass were recorded at sites above pH 5.9. Protonemura sp. in Plecoptera and Rhyacophila sp. in Trichoptera dominated in biomass and population density in acidic water with Orthocladinae sp. The larva of Ephemeroptera dominated only in sites above pH 5.9. We may present pH 6 for chemical threshold that biological changes by acidification begin to start from this level under the considerations of our results and some papers concerning the pH-threshold for aquatic organisms.
新潟大学教育学部
2010-10
jpn
departmental bulletin paper
http://hdl.handle.net/10191/13296
https://niigata-u.repo.nii.ac.jp/records/26516
AA12358288
18833845
新潟大学教育学部研究紀要 自然科学編
新潟大学教育学部研究紀要 自然科学編
3
1
31
40
https://niigata-u.repo.nii.ac.jp/record/26516/files/3(1)_31-40.pdf
application/pdf
2.3 MB
2019-08-19