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Title: Nematomorph parasites drive energy flow through a riparian ecosystem
Authors: Sato, Takuya
Watanabe, Katsutoshi  kyouindb  KAKEN_id
Kanaiwa, Minoru
Niizuma, Yasuaki
Harada, Yasushi
Lafferty, Kevin D.
Author's alias: 佐藤, 拓哉
Keywords: energy flow
indirect effect
manipulative parasite
Nematomorpha
riparian ecosystem
Japan
Issue Date: Jan-2011
Publisher: Ecological Society of America
Citation: SatoT, Watanabe K, Kanaiwa M, Niizuma Y, Harada Y. and Lafferty K. D. 2011 Nematomorph parasites drive energy flow through a riparian ecosystem. Ecology 92: 201-207
Journal title: Ecology
Volume: 92
Issue: 1
Start page: 201
End page: 207
Abstract: Parasites are ubiquitous in natural systems and ecosystem-level effects should be proportional to the amount of biomass or energy flow altered by the parasites. Here we quantified the extent to which a manipulative parasite altered the flow of energy through a forest-stream ecosystem. In a Japanese headwater stream, camel crickets and grasshoppers (Orthoptera) were 20 times more likely to enter a stream if infected by a nematomorph parasite (Gordionus spp.), corroborating evidence that nematomorphs manipulate their hosts to seek water where the parasites emerge as free-living adults. Endangered Japanese trout (Salvelinus leucomaenis japonicus) readily ate these infected orthopterans, which due to their abundance, accounted for 60% of the annual energy intake of the trout population. Trout grew fastest in the fall, when nematomorphs were driving energy-rich orthopterans into the stream. When infected orthopterans were available, trout did not eat benthic invertebrates in proportion to their abundance, leading to the potential for cascading, indirect effects through the forest-stream ecosystem. These results provide the first quantitative evidence that a manipulative parasite can dramatically alter the flow of energy through and across ecosystems.
Description: 寄生者(ハリガネムシ類)が駆動する渓畔生態系のエネルギー流の解明.京都大学プレスリリース.2011-04-13.
Rights: © 2011 by the Ecological Society of America
URI: http://hdl.handle.net/2433/139443
DOI(Published Version): 10.1890/09-1565.1
Related Link: http://www.kyoto-u.ac.jp/ja/news_data/h/h1/news6/2011/110412_2.htm
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