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Titolo:
Landscape complexity and farming practice influence the condition of polyphagous carabid beetles
Autore:
Ostman, O; Ekbom, B; Bengtsson, J; Weibull, AC;
Indirizzi:
Swedish Univ Agr Sci, Dept Ecol & Crop Prod Sci, S-75007 Uppsala, Sweden Swedish Univ Agr Sci Uppsala Sweden S-75007 Sci, S-75007 Uppsala, Sweden Swedish Univ Agr Sci, Dept Entomol, S-75007 Uppsala, Sweden Swedish Univ Agr Sci Uppsala Sweden S-75007 mol, S-75007 Uppsala, Sweden
Titolo Testata:
ECOLOGICAL APPLICATIONS
fascicolo: 2, volume: 11, anno: 2001,
pagine: 480 - 488
SICI:
1051-0761(200104)11:2<480:LCAFPI>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
INHABITING CEREAL FIELDS; GROUND BEETLES; TACHYPORUS-HYPNORUM; RHOPALOSIPHUM-PADI; BEMBIDION-LAMPROS; STRIP-MANAGEMENT; ACTIVITY-DENSITY; FOOD LIMITATION; SPRING BARLEY; COLEOPTERA;
Keywords:
aphids; Carabidae; condition; beetle; farming practice; fat reserve; landscape composition; landscape structure; mass-length residuals; natural enemies;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
37
Recensione:
Indirizzi per estratti:
Indirizzo: Ostman, O Swedish Univ Agr Sci, Dept Ecol & Crop Prod Sci, POB 7043, S-75007 Uppsala, Sweden Swedish Univ Agr Sci POB 7043 Uppsala Sweden S-75007 la, Sweden
Citazione:
O. Ostman et al., "Landscape complexity and farming practice influence the condition of polyphagous carabid beetles", ECOL APPL, 11(2), 2001, pp. 480-488

Abstract

Previous work has suggested that the condition of polyphagous predatory carabid beetles can be influenced by landscape structure and farming practice. However, earlier studies aimed at testing the effect of farming practice on insect condition and reproduction have not been designed to test this accurately because farms representing different cultivation systems have not had similar landscape complexity. In this study we measured the condition of the polyphagous predatory carabid beetles Harpalus rufipes, Pterostichus cupreus, P. melanarius, and P. niger from five pairs of conventional and organic farms in central east Sweden. The farms within each pair were near toeach other and had similar size, land use, and landscape structure. The condition of the beetles was measured as the residuals from the regression between 1n(elytra length) and 1n(body mass). We show that the residuals for P. melanarius were positively correlated with their fat reserves. For P. melanarius, residuals were higher on farms where the fields had high perimeter-to-area ratio. The pooled residuals of H. rufipes, P. cupreus, and P. niger were positively correlated with the perimeter-to-area ratio and crop diversity. Pterostichus melanarius from organic farms had better condition thanconspecifics at conventional farms, and for H. rufipes, P. cupreus, and P.niger combined there was a tendency toward better condition on organic farms than at conventional farms. Harpalus rufipes, P. cupreus, P. melanarius,and P. niger; which are all polyphagous predatory carabid beetles, are natural enemies of pest aphids in the agroecosystem. We conclude that, by manipulating landscape structure and composition, improvement in the condition of polyphagous predatory carabid beetles could be achieved, thereby potentially increasing populations of these beneficial insects.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/09/20 alle ore 13:29:54