文章基本信息

标题：Ecological Effects of a Chum Salmon ( Oncorhynchus keta ) Spawning Run in a Small Stream of the Pacific Northwest
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作者：Noboru Minakawa ; Robert I. Gara
期刊名称：Journal of Freshwater Ecology
印刷版ISSN：0270-5060
电子版ISSN：2156-6941
出版年度：1999
卷号：14
期号：3
页码：327-335
DOI：10.1080/02705060.1999.9663687
出版社：Taylor & Francis
摘要：We studied effects of chum salmon spawning activities on nutrients, epilithic algae, and benthic insect communities in a small stream of Pacific Northwest. The reach with salmon spawning had greater concentrations of Kjeldahl-N, NH 4 -N, and total soluble P than the reach without salmon. However, chlorophyll a concentration was lower in the reach with salmon. In particular, chlorophyll a concentration was significantly lower during salmon spawning. Three caddisfly genera and two stonefly genera collected from salmon carcasses fed on salmon flesh. The total insect density in containers baited with salmon flesh was significantly greater than in containers without salmon flesh, but the difference was insignificant for the total biomass. Orthocladiinae and Baetis sp. had significantly greater densities and biomasses in the containers with salmon flesh. These results support the notion that mass salmon spawning activities affect structure and dynamics of ecosystems.