American mink in the Cape Horn Biosphere Reserve, southern Chile: a population and community approach to understand a recent island invasion

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dc.contributor.authorIbarra Eliessetch, José Tomás
dc.contributor.authorSchüttler, Elke
dc.contributor.authorAltamirano Oyarzún, Tomás Alberto
dc.contributor.authorRozzi, Ricardo
dc.contributor.authorBonacic Salas, Cristian
dc.date.accessioned2022-11-22T19:38:12Z
dc.date.available2022-11-22T19:38:12Z
dc.date.issued2009
dc.description.abstractSince 2001 exotic Mustela vison has been known to populate Navarino, an island located in the pristine Cape Horn Archipelago (54-55ºS). As an invasive predator, it could be affecting the biodiversity that evolved in absence of mammalian terrestrial predators. We report the abundance (using live-trapping and sign surveys) of mink and its seasonal impact (through bird sampling, diet analysis, and artificial nest predation) upon the wetland bird community. Mink signs were found in 79% of the surveys in all types of semi-aquatic habitats. Yet, relative population abundance (0.75 mink/km of coastline) was still below densities measured in other invaded or native areas. The habitat model accuracies indicated that mink were less specific in habitat use, probably due to the missing limitations normally imposed by predators or competitors. The selected models predicted that mink prefer to use shrubland instead of open habitat, coastal areas with heterogeneous shores instead of flat beaches, and interestingly, that mink avoid habitats strongly modified by beavers. Fifty-six bird species were registered with marked seasonal variations in richness and total number of birds. Near half (48%) of bird species were migratory, arriving to the area in summer. Seasonal differences in the diet of M. vison were observed (n=414 scats). Scat analysis showed fragments of birds in 36% of the samples collected during summer, but only 21% in winter scats. This agrees with the increase in the number of birds during their reproductive period. Species like Chloephaga picta and some passerine birds are at a greater risk of being predated by mink. Conversely, predation of mink on artificial nests was very low. Our results shows that mink have colonised the entire island and is opportunistically predating on birds. For the management of mink, we suggest the establishment of rocky coastal shores as priority sites deserving special conservation efforts.
dc.fuente.origenSIPA
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/65666
dc.information.autorucSede regional de villarrica ; Ibarra Eliessetch, José Tomás ; 0000-0002-7705-3974 ; 120091
dc.language.isoen
dc.nota.accesoContenido parcial
dc.relation.ispartofInternational Mammalogical Congress (10° : 2009 : Mendoza, Argentina)
dc.rightsacceso abierto
dc.subjectAvifaunaes_ES
dc.subjectCapture-mark-recapturees_ES
dc.subjectCastor canadensises_ES
dc.subjectDietes_ES
dc.subjectInvasive exotic specieses_ES
dc.subjectMustela visones_ES
dc.subjectSeasonal variationses_ES
dc.subjectSign surveyses_ES
dc.subjectSub-Antarctices_ES
dc.subjectWetlandses_ES
dc.titleAmerican mink in the Cape Horn Biosphere Reserve, southern Chile: a population and community approach to understand a recent island invasiones_ES
dc.typecomunicación de congreso
sipa.codpersvinculados120091
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