A long-term study of vertebrate predator responses to an El Nino (ENSO) disturbance in western South America

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dc.contributor.authorJaksic, FM
dc.contributor.authorSilva, SI
dc.contributor.authorMeserve, PL
dc.contributor.authorGutierrez, JR
dc.date.accessioned2025-01-21T01:33:27Z
dc.date.available2025-01-21T01:33:27Z
dc.date.issued1997
dc.description.abstractWe analyzed the putative effects of the El Nino Southern Oscillation (ENSO) of 1991-92 in a semi-arid locality of northern Chile. We obtained 30 months of pre ENSO data, followed by 36 months of peak and post ENSO data (total = 5.5 yr). The rainy winter of 1991 resulted in a three-fold increase in total seed bank (perennial and ephemerals pooled) and in ephemeral (but not perennial) herb cover. Seed and herbage eaters (rodents) irrupted to population levels ca 20 times higher during the breeding season of 1991 than the preceding wintering season. Diurnal carnivorous predators (hawks, owls, and foxes) showed a delayed response to the irruption, increasing from seven individuals sighted during the wintering season of 1991 to 13 during the wintering season of 1992. A seemingly counterclockwise trajectory of predator abundance versus prey levels suggested a pattern of prey-driven dynamics, but confidence intervals were likely broad. In this semiarid locality, it appears that ENSO effects did not cascade down from higher to lower trophic levels, but rather the opposite. In this bottom-up scenario, we predict that as primary productivity varies with rainfall, so should secondary (mammal prey densities), and tertiary productivity (vertebrate predators). Long-term monitoring of this terrestrial ecosystem is needed to test this prediction.
dc.fuente.origenWOS
dc.identifier.eissn1600-0706
dc.identifier.issn0030-1299
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/97426
dc.identifier.wosidWOS:A1997WJ76900016
dc.issue.numero2
dc.language.isoen
dc.pagina.final354
dc.pagina.inicio341
dc.revistaOikos
dc.rightsacceso restringido
dc.subject.ods13 Climate Action
dc.subject.ods15 Life on Land
dc.subject.odspa13 Acción por el clima
dc.subject.odspa15 Vida de ecosistemas terrestres
dc.titleA long-term study of vertebrate predator responses to an El Nino (ENSO) disturbance in western South America
dc.typeartículo
dc.volumen78
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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