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Effects of fine sediment accumulation on the redd environment and the survival rate of masu salmon (Oncorhynchus masou) embryos

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Title: Effects of fine sediment accumulation on the redd environment and the survival rate of masu salmon (Oncorhynchus masou) embryos
Authors: Yamada, Hiroyuki Browse this author →KAKEN DB
Nakamura, Futoshi Browse this author →KAKEN DB
Keywords: Dissolved oxygen
Eyed egg
Flux
Hyporheic
Pool-riffle
Issue Date: Jul-2009
Publisher: Springer Japan
Journal Title: Landscape and Ecological Engineering
Volume: 5
Issue: 2
Start Page: 169
End Page: 181
Publisher DOI: 10.1007/s11355-009-0065-8
Abstract: In recent years, fine sediment, produced by run-off associated with forestry activity and agricultural development that accumulates on riverbeds, has exerted a deleterious influence on lotic ecosystems. This study examined the Oroennukibetsu River, a tributary of the Nukibetsu River, which has been affected by high loads of suspended sediments. Effects of accumulation of fine sediment on the survival rate of masu salmon embryo and also on the redd environment (permeability and intragravel dissolved oxygen concentration) were quantified through a field experiment. Results show that the interchange of DO between intragravel and surface water was not affected directly by permeability or the accumulated fine sediment, and that intragravel flow rates can be an important factor controlling embryo survival. A decrease in permeability associated with accumulation of fine sediment lowered the survival rate of embryos by suffocation because the flux of DO that should be supplied to the embryo was severely limited. This situation might be created by the combined effects of an accumulation of fine sediment on the redd and a low DO concentration in the surface water because the DO concentration almost coincided with the intragravel DO.
Rights: The original publication is available at www.springerlink.com
Type: article (author version)
URI: http://hdl.handle.net/2115/39028
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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