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タイトル: 都市-農地景観においてサケ残滓の腐食機能は腐食性脊椎動物を介して変化するか?
その他のタイトル: Dose the structure of vertebrate scavengers alter salmon scavenging function along urban-agricultural gradient?
著者: 玉田, 祐介
発行日: 2017
抄録: Allochthonous resource from sea into land supports terrestrial species and food webs. Throughout the North Pacific region, the annual migration of Pacific salmon Oncorhynchus spp. from sea into rivers and streams, where they spawn and die, is one of the example of allochthonous resource. Scavenging salmon carcass by vertebrate scavengers delivers marine nutrients to terrestrial ecosystems and supports the populations of many animal species. Moreover, Urbanization, which is one of the main causes of global biodiversity loss, may alter the structure of vertebrate scavengers. The alteration may also alter scavenging efficiently (gain or loss) or maintain the efficiently (because of functional redundancy or dominant species). However, how the structure of vertebrate scavengers and scavenging efficiently alter along urban-agriculture gradient is not revealed. I used 18 motion-triggered cameras and 144 salmon carcasses (8 salmons/camera) to examine urbanization and other factors affecting the structure of vertebrate scavengers and scavenging efficiently (rates of carcass removal and removal time) from October to December, 2016 in Tokachi river system, Northern Japan. The structure of vertebrate scavengers was not associated with urbanization, and red fox Vulpes vulpes is dominant in whole study sites. Moreover, rate of carcass removal was not altered, but removal time was decreased with urbanization and increase of forest area. This result suggests the population dynamics of the dominant mesopredator associated with landscape factors would determine scavenging efficiently in urban-agriculture landscape. This study suggests the conservation of remnant forests in agriculture zone is useful method for maintaining land-sea connectivity.
記述: 畜産生命科学専攻
Master’s Course of Agro-Environmental Science
平成28年度修士学位論文
URI: http://ir.obihiro.ac.jp/dspace/handle/10322/4413
権利情報: 玉田祐介
出現コレクション:03010学位論文(修士)

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