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発表 Flood disturbance and predator-prey effects on regional gradients in species diversity

作成年度 2012 年度
論文名 Flood disturbance and predator-prey effects on regional gradients in species diversity
論文名(和訳)
論文副題
発表会 INTECOL 2013(11th International Congress of Ecology 2013)
誌名 INTECOL 2013(11th International Congress of Ecology 2013)
巻・号・回 11
発表年月日 2013/02/01
所属研究室/機関名 著者名(英名)
独立行政法人土木研究所水環境研究グループ自然共生研究センター森照貴
北海道大学齊藤隆
独立行政法人土木研究所水環境研究グループ河川生態チーム萱場祐一
抄録
The effects of both abiotic factors and biotic interactions among guilds (i.e.,inter-guild effects) have been suggested to be important for understanding spatial variation in species diversity; however, compared to the effects of abiotic factors, the processes by which the inter-guild effects are mediated have been little described. We accordingly investigated stream invertebrate assemblages on Hokkaido Island, Japan, and assessed how the processes of determining regional patterns in species diversity differed among guilds (collector-filterers, collector-gatherers/shredders, scrapers, and predators) by taking both inter-guild and abiotic effects into consideration using Bayesian networks. Collector-gatherers/shredders, collector-filterers, and predators exhibited significant regional gradients in taxonomic richness. Gradients in the former two guilds can be generated by variation in flood disturbace regardless of interactions with other guilds. The gradient in predator taxonomic richness was indirectly related to flood disturbance and was directly generated by bottom-up effects through their prey (collector-gatherers/shredders and collector-filterers). We found that not only environmental factors but also inter-guild effects may be essential for forming the regional gradient in predators, unlike those for collector-gatherers/shredders and collector-filterers. The processes underlying the regional variation in taxonomic richness of the three guilds are interpreted in terms of the "more individuals" hypothesis, facilitation, and predator-prey relationships.
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