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Relationship between salmon egg subsidy and the distribution of an avian predator

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Title: Relationship between salmon egg subsidy and the distribution of an avian predator
Authors: Yamada, Taihei Browse this author
Katahira, Hirotaka Browse this author
Miura, Kazuki Browse this author
Nakamura, Futoshi Browse this author →KAKEN DB
Keywords: behavioral ecology
marine-derived nutrients
Pacific salmon
resource subsidy
stream ecology
Issue Date: Dec-2022
Publisher: John Wiley & Sons
Journal Title: Ecology and evolution
Volume: 12
Issue: 12
Start Page: e9696
Publisher DOI: 10.1002/ece3.9696
Abstract: As a spatial subsidy, which is the phenomenon of transferring resources from a donor system to a recipient system, anadromous salmonids contribute to the supply of marine-derived nutrients to freshwater and terrestrial systems. Live salmon and salmon carcasses and eggs are utilized by various organisms and affect their abundance and distribution. However, the evaluation of the effect of salmon subsidies on the abundance and distribution of terrestrial animals is biased toward predators or scavengers that utilize spawning adults and carcasses, and few studies have focused on the effect of salmon eggs as a subsidy. To avoid underestimating the function of salmon subsidies, the response to the availability of salmon eggs in various systems should be investigated. Here, we investigated the abundance and feeding behavior of the brown dipper Cinclus pallasii, as a consumer of salmon eggs, based on the hypothesis that the availability of salmon eggs affects the diet composition and stream distribution of this small predator. In addition, to test whether changes in the abundance of brown dippers are determined by salmon spawning, their abundance was compared upstream and downstream of the check dams in three streams during the peak spawning period. Brown dippers used salmon eggs during the spawning season (53.7% of diet composition), and their abundance increased as the number of spawning redds increased. In contrast, this pattern was not observed upstream of the check dam. These results suggested that the abundance and stream distribution of brown dippers vary according to the variation in the spatiotemporal availability of salmon eggs.
Type: article
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)

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