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タイトル: Geotaxis and leaf-surface preferences mitigate negative effects of a predatory mite on an herbivorous mite.
著者: Sudo, Masaaki
Osakabe, Masahiro  kyouindb  KAKEN_id
著者名の別形: 須藤, 正彬
刑部, 正博
キーワード: Top-down regulation
Predator avoidance
Habitat architecture
Gravity
発行日: Apr-2013
出版者: Springer Netherlands
誌名: Experimental & applied acarology
巻: 59
号: 4
開始ページ: 409
終了ページ: 420
抄録: Reproductive success and population growth of an herbivorous mite are limited by activities of phytoseiid predators. However, occurrences on upper versus lower leaf surfaces are sometimes mismatched between these prey and predators. The mismatch potentially mitigates predation risk for the prey species. We assessed factors that affect mite distributions on leaf surfaces, testing whether the presence of the phytoseiid mite Phytoseius nipponicus alters the leaf-surface distribution and reproductive success of the herbivorous false spider mite Brevipalpus obovatus. The host plant was Viburnum erosum var. punctatum (Adoxaceae). Leaves were set in natural (TRUE) and reversed (upside down; INVERTED) orientations using experimental devices. Both surfaces were accessible to mites. We detected lower and abaxial leaf-surface preferences in P. nipponicus. In contrast, upper and adaxial surfaces were preferred by B. obovatus. Thus, prey and predatory mites accumulated on different sides of leaves. Presence of the predator also indirectly decreased egg production in B. obovatus. Brevipalpus obovatus females actively avoided leaf surfaces with elevated predator numbers; these females shifted their distributions and changed oviposition sites to leaf surfaces with fewer predators. In consequence, B. obovatus eggs on the upper sides of leaves were less frequently preyed upon than were those on lower sides. We suggest that upper leaf-surface exploitation in this particular herbivorous mite species mitigates predation risk from phytoseiid mites, which prefer lower leaf surfaces.
著作権等: The final publication is available at link.springer.com
This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
URI: http://hdl.handle.net/2433/173404
DOI(出版社版): 10.1007/s10493-012-9622-1
PubMed ID: 23011108
出現コレクション:学術雑誌掲載論文等

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