HETEROGENEOUS RESPONSES OF SMALL MAMMALS TO AN EL-NINO SOUTHERN-OSCILLATION EVENT IN NORTHCENTRAL SEMIARID CHILE AND THE IMPORTANCE OF ECOLOGICAL SCALE

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dc.contributor.authorMESERVE, PL
dc.contributor.authorYUNGER, JA
dc.contributor.authorGUTIERREZ, JR
dc.contributor.authorCONTRERAS, LC
dc.contributor.authorMILSTEAD, WB
dc.contributor.authorLANG, BK
dc.contributor.authorCRAMER, KL
dc.contributor.authorHERRERA, S
dc.contributor.authorLAGOS, VO
dc.contributor.authorSILVA, SL
dc.contributor.authorTABILO, EL
dc.contributor.authorTORREALBA, MA
dc.contributor.authorJAKSIC, FM
dc.date.accessioned2025-01-21T01:34:48Z
dc.date.available2025-01-21T01:34:48Z
dc.date.issued1995
dc.description.abstractA prolonged El Nino Southern Oscillation (ENSO) event during 1991-1992 with three times the normal annual 85-mm rainfall was accompanied by major changes in numbers of small mammals at a semiarid Mediterranean site in northcentral Chile. Several demographic patterns were evident. Akodon olivacerrs, an omnivore, had a rapid increase in population size of more than an order of magnitude. Phyllotis darwini, a granivore-herbivore, showed somewhat delayed, smaller increases superimposed on annual oscillations. Octodon degus, an herbivore, showed a delayed response with larger increases and extended breeding in 1992-1993. Finally, Oligorzyzomys longicaudatus, a granivore, experienced increases during both a dry (1990, ppt = 32 mm) and a wet year (1992). Other species such as Aborthrix longipilis, Abrocoma bennetti, and Thylamys elegans had smaller, delayed demo,oraphic responses. Reproductive rates for the first three species were higher due to the ENSO event only in O. negus males and P. darwini as a quadratic function of time. Survival rates of all four principal species were significantly greater during the 1991-1992 ENSO. Finally, average movement between captures was lower during ENSO years, suggesting behavioral changes. Explanations for these patterns include rainfall-related increases in food-resource levels (A. olivaceus and P. darwini), the importance of source-sink processes in vagile species from more mesic, adjacent habitats (O. longicaudatus), and delayed responses to extrinsic events in species with long gestation (O. degus, A. bennetti). The heterogeneity of species responses suggests different capabilities for small mammals to respond to an extrinsic, large-scale event, and it emphasizes the importance of long-term studies in semiarid systems.
dc.fuente.origenWOS
dc.identifier.issn0022-2372
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/97605
dc.identifier.wosidWOS:A1995QZ50200027
dc.issue.numero2
dc.language.isoen
dc.pagina.final595
dc.pagina.inicio580
dc.revistaJournal of mammalogy
dc.rightsacceso restringido
dc.subjectSIGMODONTINES
dc.subjectCAVIOMORPHS
dc.subjectPOPULATION FLUCTUATIONS
dc.subjectEL NINO (ENSO) EVENTS
dc.subjectCHILE
dc.subjectSEMIARID ZONE
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.titleHETEROGENEOUS RESPONSES OF SMALL MAMMALS TO AN EL-NINO SOUTHERN-OSCILLATION EVENT IN NORTHCENTRAL SEMIARID CHILE AND THE IMPORTANCE OF ECOLOGICAL SCALE
dc.typeartículo
dc.volumen76
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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