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Biotic interactions between Eriopis connexa and Hippodamia variegata (Coleoptera: Coccinellidae), a native and an exotic species associated with alfalfa fields in Chile

2012-01Journal article Restricted access
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dc.contributor.authorGrez, A. A.
dc.contributor.authorViera, B.
dc.contributor.authorSoares, António O.
dc.date.accessioned2013-04-11T16:11:01Z
dc.date.available2013-04-11T16:11:01Z
dc.date.issued2012-01
dc.descriptionCopyright © 2012 Entomologia Experimentalis et Applicata © 2011 The Netherlands Entomological Society.en
dc.description.abstractHuman-assisted introductions, including those in the context of biological control, are considered to be one of the most important factors of global environmental change. However, the mechanisms underlying environmental changes, such as a decrease in the relative abundance of native species, are poorly understood. Since the introduction of the ladybird beetle, Hippodamia variegata (Goeze) (Coleoptera: Coccinellidae), in Chile in the 1970s for biological control of aphids, a reduction in the relative abundance of the native ladybird beetle Eriopis connexa (Germar) has been noticed. To explore the role of cannibalism, intraguild predation (IGP) or competition as possible mechanisms that might increase dominance of H. variegata over E. connexa, several laboratory experiments were carried out. The native and the exotic species were very similar in their voracity and biotic interactions. Although H. variegata was able to maintain constant reproductive performance, E. connexa reproduction decreased at lower densities of aphids, Acyrthosiphon pisum (Harris) (Hemiptera: Aphididae). The impacts of cannibalism, IGP, and competition exerted by these species were very symmetrical in both larvae and adults. We conclude that these biotic factors may not fully explain the increase in relative abundance of H. variegata. The higher sensitivity of E. connexa to prey patch size, along with other factors such as chemical-mediated negative interspecific interactions may be operating in alfalfa fields, changing the composition of associated coccinellid assemblages.en
dc.identifier.citationGrez, A.A., Viera, B. & Soares, A.O. (2012). "Biotic interactions between Eriopis connexa and Hippodamia variegata (Coleoptera: Coccinellidae), a native and an exotic species associated with alfalfa fields in Chile". «Entomologia Experimentalis et Applicata», 142: 36-44. http://dx.doi.org/10.1111/j.1570-7458.2011.01202.x.en
dc.identifier.issn0013-8703 (Print)
dc.identifier.issn1570-7458 (Online)
dc.identifier.urihttp://hdl.handle.net/10400.3/1808
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherWiley-Blackwellpor
dc.relation.publisherversionhttp://dx.doi.org/10.1111/j.1570-7458.2011.01202.xpor
dc.subjectCannibalismen
dc.subjectIntraguild Predationen
dc.subjectIntraspecific and Interspecific Competitionen
dc.subjectExperimentsen
dc.subjectPredator–Predator Interactionsen
dc.subjectColeopterapor
dc.subjectCoccinellidaepor
dc.subjectMedicago sativapor
dc.subjectFabaceaepor
dc.subjectAcyrthosiphon pisumpor
dc.subjectHemipterapor
dc.subjectAphididaepor
dc.titleBiotic interactions between Eriopis connexa and Hippodamia variegata (Coleoptera: Coccinellidae), a native and an exotic species associated with alfalfa fields in Chileen
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage44por
oaire.citation.issue(1)por
oaire.citation.startPage36por
oaire.citation.titleEntomologia Experimentalis et Applicatapor
oaire.citation.volume142por
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor

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