Migration of coccinellids to alfalfa fields with varying adjacent vegetation in Central Chile

Permanent and permeable edges, where natural enemies can feed, overwinter or easily cross over, should enhance the early arrival of these predators to crops. We evaluated the abundance and species richness of coccinellids migrating to alfalfa fields adjacent to Eucalyptus, a mix of false acacia, bla...

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Autores principales:	Grez,Audrey A, Torres,Constanza, Zaviezo,Tania, Lavandero,Blas, Ramírez,Marcelo
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Chile. Facultad de Agronomía e Ingeniería Forestal 2010
Materias:	agroecosystems conservation biological control edge effects ladybeetles migration natural enemies
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202010000200011
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spelling	oai:scielo:S0718-162020100002000112010-10-14Migration of coccinellids to alfalfa fields with varying adjacent vegetation in Central ChileGrez,Audrey ATorres,ConstanzaZaviezo,TaniaLavandero,BlasRamírez,Marcelo agroecosystems conservation biological control edge effects ladybeetles migration natural enemies Permanent and permeable edges, where natural enemies can feed, overwinter or easily cross over, should enhance the early arrival of these predators to crops. We evaluated the abundance and species richness of coccinellids migrating to alfalfa fields adjacent to Eucalyptus, a mix of false acacia, blackberries and poplar (F-B-P), vineyards, corn and annual vegetables. From September 2007 to May 2008, we captured coccinellids in three sticky traps (2.64 m²) placed at the borders between alfalfa fields and adjacent vegetation. We also estimated the abundance of aphid populations in the alfalfa fields, by counting the number of individuals per alfalfa stem in spring, summer and autumn. We collected 90,396 coccinellids from 14 species. Neither total abundance nor species richness of coccinellids was significantly affected by adjacent vegetation, but Adalia deficiens, Psyllobora picta and Cycloneda sanguínea were more abundant in alfalfa adjacent to Eucalyptus and F-B-P, meanwhile Olla v-nigrum next to annual crops and Hyperaspis sphaeridioides next to vineyards. Edge height and orientation explained 94% of the variance in species abundance. Particularly, P. picta and O. v-nigrum were positively and negatively influenced by border height, respectively. Hyperaspis sphaeridioides was negatively affected by northern exposure and none of the species was affected by edge permeability. Aphids were less abundant in alfalfa fields adjacent to F-B-P, especially in spring. These results show that most species of coccinellids were not affected by the composition of crop edges, although tall permanent edges may enhance the arrival of particular coccinellid species to alfalfa fields.info:eu-repo/semantics/openAccessPontificia Universidad Católica de Chile. Facultad de Agronomía e Ingeniería ForestalCiencia e investigación agraria v.37 n.2 20102010-08-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202010000200011en10.4067/S0718-16202010000200011
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	agroecosystems conservation biological control edge effects ladybeetles migration natural enemies
spellingShingle	agroecosystems conservation biological control edge effects ladybeetles migration natural enemies Grez,Audrey A Torres,Constanza Zaviezo,Tania Lavandero,Blas Ramírez,Marcelo Migration of coccinellids to alfalfa fields with varying adjacent vegetation in Central Chile
description	Permanent and permeable edges, where natural enemies can feed, overwinter or easily cross over, should enhance the early arrival of these predators to crops. We evaluated the abundance and species richness of coccinellids migrating to alfalfa fields adjacent to Eucalyptus, a mix of false acacia, blackberries and poplar (F-B-P), vineyards, corn and annual vegetables. From September 2007 to May 2008, we captured coccinellids in three sticky traps (2.64 m²) placed at the borders between alfalfa fields and adjacent vegetation. We also estimated the abundance of aphid populations in the alfalfa fields, by counting the number of individuals per alfalfa stem in spring, summer and autumn. We collected 90,396 coccinellids from 14 species. Neither total abundance nor species richness of coccinellids was significantly affected by adjacent vegetation, but Adalia deficiens, Psyllobora picta and Cycloneda sanguínea were more abundant in alfalfa adjacent to Eucalyptus and F-B-P, meanwhile Olla v-nigrum next to annual crops and Hyperaspis sphaeridioides next to vineyards. Edge height and orientation explained 94% of the variance in species abundance. Particularly, P. picta and O. v-nigrum were positively and negatively influenced by border height, respectively. Hyperaspis sphaeridioides was negatively affected by northern exposure and none of the species was affected by edge permeability. Aphids were less abundant in alfalfa fields adjacent to F-B-P, especially in spring. These results show that most species of coccinellids were not affected by the composition of crop edges, although tall permanent edges may enhance the arrival of particular coccinellid species to alfalfa fields.
author	Grez,Audrey A Torres,Constanza Zaviezo,Tania Lavandero,Blas Ramírez,Marcelo
author_facet	Grez,Audrey A Torres,Constanza Zaviezo,Tania Lavandero,Blas Ramírez,Marcelo
author_sort	Grez,Audrey A
title	Migration of coccinellids to alfalfa fields with varying adjacent vegetation in Central Chile
title_short	Migration of coccinellids to alfalfa fields with varying adjacent vegetation in Central Chile
title_full	Migration of coccinellids to alfalfa fields with varying adjacent vegetation in Central Chile
title_fullStr	Migration of coccinellids to alfalfa fields with varying adjacent vegetation in Central Chile
title_full_unstemmed	Migration of coccinellids to alfalfa fields with varying adjacent vegetation in Central Chile
title_sort	migration of coccinellids to alfalfa fields with varying adjacent vegetation in central chile
publisher	Pontificia Universidad Católica de Chile. Facultad de Agronomía e Ingeniería Forestal
publishDate	2010
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202010000200011
work_keys_str_mv	AT grezaudreya migrationofcoccinellidstoalfalfafieldswithvaryingadjacentvegetationincentralchile AT torresconstanza migrationofcoccinellidstoalfalfafieldswithvaryingadjacentvegetationincentralchile AT zaviezotania migrationofcoccinellidstoalfalfafieldswithvaryingadjacentvegetationincentralchile AT lavanderoblas migrationofcoccinellidstoalfalfafieldswithvaryingadjacentvegetationincentralchile AT ramirezmarcelo migrationofcoccinellidstoalfalfafieldswithvaryingadjacentvegetationincentralchile
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Migration of coccinellids to alfalfa fields with varying adjacent vegetation in Central Chile

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