Movement between crops and weeds: temporal refuges for aphidophagous insects in Central Chile

C.M. Villegas, J.A. Verdugo, A.A. Grez, J. Tapia, and B. Lavandero. 2013. Movement between crops and weeds: temporal refuges for aphidophagous insects in Central Chile. Cien. Inv. Agr. 40(2): 317-326. Crop edges have significant effects on populations of natural enemies, acting as source or sink hab...

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Autores principales:	Villegas,Cinthya M, Verdugo,Jaime A, Grez,Audrey A, Tapia,Jaime, Lavandero,Blas
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Chile. Facultad de Agronomía e Ingeniería Forestal 2013
Materias:	Alfalfa coccinellids refuges rubidium thistle
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202013000200007
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spelling	oai:scielo:S0718-162020130002000072013-10-23Movement between crops and weeds: temporal refuges for aphidophagous insects in Central ChileVillegas,Cinthya MVerdugo,Jaime AGrez,Audrey ATapia,JaimeLavandero,Blas Alfalfa coccinellids refuges rubidium thistle C.M. Villegas, J.A. Verdugo, A.A. Grez, J. Tapia, and B. Lavandero. 2013. Movement between crops and weeds: temporal refuges for aphidophagous insects in Central Chile. Cien. Inv. Agr. 40(2): 317-326. Crop edges have significant effects on populations of natural enemies, acting as source or sink habitats during the growing season. Previous observations have shown that coccinellid species are associated with thistle (Sylibum marianum (L.) Gaertn), a common exotic weed in the central valley of Chile. To determine whether thistles growing at crop edges act as a putative refuge for natural enemies, the seasonal relative abundance of aphidophagous coccinellids was estimated at 0, 10 and 25 m from the edges of three alfalfa fields. Mark-recapture studies were carried out using the trace element rubidium (Rb) to determine whether coccinellids moved between the edges and the alfalfa. The most common aphidophagous coccinellid species were Hippodamia convergens (63%), H. variegata (11%), Rhyzobius lophantae (4%) and Adalia angulifera (4%). In mid-November, the abundance of coccinellids at the edge of (0 m from the edge) the alfalfa plot increased compared to that at the center of the field (25 m from the edge), coinciding with a reduction in the population of aphids at all sampling points. Of the coccinellids captured at the thistle edge, 68% were marked with rubidium, suggesting movement of coccinellids from the alfalfa plot to the thistle growing at its edges. After the thistles were removed, coccinellids returned to the crop, as shown by the presence of marked coccinellids within the alfalfa fields at all three sampling distances. The results of this study suggest that thistles can act as a refuge for coccinellids when aphids are not available in the alfalfa fields.info:eu-repo/semantics/openAccessPontificia Universidad Católica de Chile. Facultad de Agronomía e Ingeniería ForestalCiencia e investigación agraria v.40 n.2 20132013-05-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202013000200007en10.4067/S0718-16202013000200007
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Alfalfa coccinellids refuges rubidium thistle
spellingShingle	Alfalfa coccinellids refuges rubidium thistle Villegas,Cinthya M Verdugo,Jaime A Grez,Audrey A Tapia,Jaime Lavandero,Blas Movement between crops and weeds: temporal refuges for aphidophagous insects in Central Chile
description	C.M. Villegas, J.A. Verdugo, A.A. Grez, J. Tapia, and B. Lavandero. 2013. Movement between crops and weeds: temporal refuges for aphidophagous insects in Central Chile. Cien. Inv. Agr. 40(2): 317-326. Crop edges have significant effects on populations of natural enemies, acting as source or sink habitats during the growing season. Previous observations have shown that coccinellid species are associated with thistle (Sylibum marianum (L.) Gaertn), a common exotic weed in the central valley of Chile. To determine whether thistles growing at crop edges act as a putative refuge for natural enemies, the seasonal relative abundance of aphidophagous coccinellids was estimated at 0, 10 and 25 m from the edges of three alfalfa fields. Mark-recapture studies were carried out using the trace element rubidium (Rb) to determine whether coccinellids moved between the edges and the alfalfa. The most common aphidophagous coccinellid species were Hippodamia convergens (63%), H. variegata (11%), Rhyzobius lophantae (4%) and Adalia angulifera (4%). In mid-November, the abundance of coccinellids at the edge of (0 m from the edge) the alfalfa plot increased compared to that at the center of the field (25 m from the edge), coinciding with a reduction in the population of aphids at all sampling points. Of the coccinellids captured at the thistle edge, 68% were marked with rubidium, suggesting movement of coccinellids from the alfalfa plot to the thistle growing at its edges. After the thistles were removed, coccinellids returned to the crop, as shown by the presence of marked coccinellids within the alfalfa fields at all three sampling distances. The results of this study suggest that thistles can act as a refuge for coccinellids when aphids are not available in the alfalfa fields.
author	Villegas,Cinthya M Verdugo,Jaime A Grez,Audrey A Tapia,Jaime Lavandero,Blas
author_facet	Villegas,Cinthya M Verdugo,Jaime A Grez,Audrey A Tapia,Jaime Lavandero,Blas
author_sort	Villegas,Cinthya M
title	Movement between crops and weeds: temporal refuges for aphidophagous insects in Central Chile
title_short	Movement between crops and weeds: temporal refuges for aphidophagous insects in Central Chile
title_full	Movement between crops and weeds: temporal refuges for aphidophagous insects in Central Chile
title_fullStr	Movement between crops and weeds: temporal refuges for aphidophagous insects in Central Chile
title_full_unstemmed	Movement between crops and weeds: temporal refuges for aphidophagous insects in Central Chile
title_sort	movement between crops and weeds: temporal refuges for aphidophagous insects in central chile
publisher	Pontificia Universidad Católica de Chile. Facultad de Agronomía e Ingeniería Forestal
publishDate	2013
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202013000200007
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Movement between crops and weeds: temporal refuges for aphidophagous insects in Central Chile

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