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北海道北部山地河川における細粒土砂の堆積がイトウの産卵環境および発眼卵生残率に及ぼす影響

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Title: 北海道北部山地河川における細粒土砂の堆積がイトウの産卵環境および発眼卵生残率に及ぼす影響
Other Titles: Effects of fine sediment accumulation on the redd environment and the survival rate of eyed embryos of Sakhalin taimen (Hucho perryi) in mountain streams of northern Hokkaido
Authors: 山田, 浩之1 Browse this author
河口, 洋一2 Browse this author
江戸, 謙顕3 Browse this author
小宮山, 英重4 Browse this author
Authors(alt): YAMADA, Hiroyuki1
KAWAGUCHI, Yôichi2
EDO, Kaneaki3
KOMIYAMA, Eishige4
Keywords: dissolved oxygen
embryo
fine sediment
heat flux
permeability
Issue Date: 2008
Publisher: 応用生態工学会
Journal Title: Ecology and Civil Engineering
Journal Title(alt): 応用生態工学
Volume: 11
Issue: 1
Start Page: 29
End Page: 40
Publisher DOI: 10.3825/ece.11.29
Abstract: 本研究は,北海道北部の山地河川において,細粒土砂の堆積がイトウの産卵床環境や卵の生残に及ぼす影響について検討した.その結果,溶存酸素濃度の低下により,発眼卵の生残率が低下する傾向が得られた.さらに,細粒土砂の堆積量の増加に伴い産卵床の透水係数や産室への物質の浸透性および熱の伝導性が低下することが示された.本研究の調査対象河川では細粒土砂の堆積量が低いレベルにあったため,卵の生残率に対する細粒土砂堆積の直接的な影響については明らかにすることはできなかった.よって,今後は細粒土砂の堆積が多い河川での調査や室内実験による検証作業によりどの程度の堆積量がイトウの卵の生残や発育に許容されるかについて検討すると同時に,細粒土砂の堆積を介した産卵床内部の温度環境の変化の影響についても明らかにする必要がある.
Abstract: We examined effects of fine sediment on embryo survival rate and on redd environments of an endangered species, Sakhalin taimen (Hucho perryi). Sediment accumulation, permeability, water quality and embryo survival were quantified at the redds in mountain streams in northern Hokkaido, Japan, and their correlations were assessed. The results indicated that the survival rate was negatively correlated with dissolved oxygen concentration. However, the direct effects of fine sediment on the embryo were not clarified because the accumulations were low in those streams. Moreover, results clarified that accumulations lower the interchange ability of redd water and conduction of heat, despite the low accumulation level. Further research must investigate the fine sediment effects associated with heat flux.
Rights: © 2008 応用生態工学会
Type: article
URI: http://hdl.handle.net/2115/68525
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 山田 浩之

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