Ladybird (Coleoptera : Coccinellidae) dispersal in experimental fragmented alfalfa landscapes

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dc.contributor.authorGrez, AA
dc.contributor.authorZaviezo, T
dc.contributor.authorRios, M
dc.date.accessioned2024-01-10T13:49:47Z
dc.date.available2024-01-10T13:49:47Z
dc.date.issued2005
dc.description.abstractHabitat fragmentation may affect the dispersal behaviour of individuals across the landscape. If there is a high boundary contrast between the remaining fragments and the matrix, individuals should tend to stay inside the fragments, but the configuration of the landscape, i.e. the level of fragmentation and isolation distance between fragments, may modulate this. To test these ideas, we made several mark-recapture experiments with the ladybird Eriopis connexa (Germ.) in manipulated alfalfa model landscapes (30 x 30 m). Specifically we evaluated (i) ladybird movement and permanence in alfalfa and bare ground areas, (ii) how they move across fragment/matrix boundaries, (iii) how their movement between fragments within a landscape is affected by fragmentation level and isolation distance, and (iv) how their permanence in the landscape is affected by fragmentation Ievel and isolation distance. The fragmented alfalfa landscapes had a constant level of habitat loss (84%), but varied in the level of habitat fragmentation (4 or 16 fragments), and isolation distance between fragments (2 or 6 m). We also sampled aphid abundance in the different landscapes through time. We found that ladybirds stay longer and displace less in alfalfa than on bare ground, and that they move less from the alfalfa fragments to the neighbouring bare ground matrix than vice versa. At the landscape level, ladybirds had a higher inter-fragment movement when fragments were closer, they tended to remain in less fragmented landscapes, regardless of their isolation distance. Aphid abundance increased in time, but it was similar in all landscapes. Ladybird movement within fragments, in the matrix and in the boundary between both habitats explains why ladybirds concentrate within alfalfa fragments. However, their dispersal movements at the landscape level do not reflect the higher abundance sometimes found for several species of ladybirds in more fragmented landscapes. At this larger scale, other mechanisms may have a stronger influence in determining the abundance of ladybirds.
dc.format.extent8 páginas
dc.fuente.origenWOS
dc.identifier.doi10.14411/eje.2005.033
dc.identifier.eissn1802-8829
dc.identifier.urihttps://doi.org/10.14411/eje.2005.033
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/79480
dc.identifier.wosidWOS:000229497100013
dc.information.autorucAgronomía e Ing. Forestal;Zaviezo T;S/I;62543
dc.issue.numero2
dc.language.isoen
dc.nota.accesoSin adjunto
dc.pagina.final216
dc.pagina.inicio209
dc.publisherCZECH ACAD SCI, INST ENTOMOLOGY
dc.revistaEUROPEAN JOURNAL OF ENTOMOLOGY
dc.rightsregistro bibliográfico
dc.subjectdispersal
dc.subjectfragmented landscapes
dc.subjectdistance between fragments
dc.subjectmark-recapture experiments
dc.subjectladybird
dc.subjectEriopis connexa
dc.subjectPOPULATION-DYNAMICS
dc.subjectHABITAT FRAGMENTATION
dc.subjectPATCH STRUCTURE
dc.subjectBEETLES
dc.subjectDENSITY
dc.subjectPREY
dc.subjectBEHAVIOR
dc.subjectPREDATOR
dc.subjectIMMIGRATION
dc.subjectVEGETATION
dc.subject.ods15 Life on Land
dc.subject.ods13 Climate Action
dc.subject.odspa15 Vida de ecosistemas terrestres
dc.subject.odspa13 Acción por el clima
dc.titleLadybird (Coleoptera : Coccinellidae) dispersal in experimental fragmented alfalfa landscapes
dc.typeartículo
dc.volumen102
sipa.codpersvinculados62543
sipa.indexWOS
sipa.trazabilidadCarga SIPA;09-01-2024
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