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DIFFERENTIAL RESPONSE OF TWO AGROECOSYSTEM PREDATORS, PTEROSTICHUS MELANARIUS (COLEOPTERA: CARABIDAE) AND COCCINELLA SEPTEMPUNCTATA (COLEOPTERA: COCCINELLIDAE), TO HABITAT-COMPOSITION AND FRAGMENTATION-SCALE MANIPULATIONS

Published online by Cambridge University Press:  31 May 2012

John E. Banks
John E. Banks
Affiliation:
Department of Zoology, Box 351800, University of Washington, Seattle, Washington, USA 98195-1800
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Abstract

Using alternating patches of weeds and crop [broccoli, Brassica oleracea (L.) (Brassicaceae)], vegetation composition and the spatial scale at which the vegetation was fragmented were manipulated in a factorial design field experiment. The effects of these manipulations were different for two common agroecosystem predators sampled. Sevenspotted lady beetles, Coccinella septempunctata (L.), were unaffected by vegetation-composition treatments but responded strongly to fragmentation-scale manipulations. The beetle Pterostichus melanarius (Illiger) was unaffected by both fragmentation-scale and vegetation-composition manipulations. These findings highlight the challenge of developing a predictive theory of the effects of vegetation diversification on assemblages of predators in agroecosystems.

Résumé

Lors d’une expérimentation dans les plantations utilisant la méthode factorielle, j’ai manipulé la composition de la végétation de même que l’échelle spatiale à laquelle la végétation a été fragmentée en utilisant alternativement des zones de broccoli [Brassica oleracea (L.) (Brassicaceae)] et de mauvaises herbes. Les effets de ces manipulations se sont avérés différents pour les deux prédateurs communs échantillonés dans l’agro-écosystème. La coccinelle à sept points, Coccinella septempunctata (L.), s’est montrée insensible aux traitements de la composition, mais a réagi fortement aux manipulations de l’échelle de fragmentation. La carabe Pterostichus melanarius (Illiger) s’est montrée indifférent aux manipulations de la composition de la végétation ainsi qu’à celles de l’échelle de fragmentation. Ces résultats soulignent les difficultés inhérentes au développement d’une théorie prophétique des effets de la diversité de la végétation sur les asssociations des prédateurs dans les agro-écosystèmes.

Type
Articles
Information
The Canadian Entomologist , Volume 131 , Issue 5 , October 1999 , pp. 645 - 657
Copyright
Copyright © Entomological Society of Canada 1999

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