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dc.date.accessioned 2012-03-12T20:15:40Z
dc.date.available 2012-03-12T03:00:00Z
dc.date.issued 2003 es
dc.identifier.uri http://sedici.unlp.edu.ar/handle/10915/5371
dc.description.abstract During the latest Pleistocene-earliest Holocene, South American terrestrial vertebrate faunas suffered one of the largest (and probably the youngest) extinction in the world for this lapse. Megamammals, most of the large mammals and a giant terrestrial tortoise became extinct in the continent, and several complete ecological guilds and their predators disappeared. This mammal extinction had been attributed mainly to overkill, climatic change or a combination of both. We agree with the idea that human overhunting was the main cause of the extinction in South America. However, according to our interpretation, the slaughtering of mammals was accom- plished in a particular climatic, ecological and biogeographical frame. During most of the middle and late Pleis- tocene, dry and cold climate and open areas predominated in South America. Nearly all of those megamammals and large mammals that became extinct were adapted to this kind of environments. The periodic, though rela- tively short, interglacial increases in temperature and humidity may have provoked the dramatic shrinking of open areas and extreme reduction of the biomass (albeit not in diversity) of mammals adapted to open habitats. Many populations were surely close to a minimum level of population viability. During the longer glacial periods, mammals populations recovered. This alternation of low and high biomass of mammals from open and closed areas is what we refer to as the Zig-Zag. During the present interglacial, humans entered South America and broke the Zig-Zag when killed all the megamammals and almost all the large mammals during their less favourable periodic lapse. es
dc.language en es
dc.subject Extinción Biológica es
dc.subject climate; extinction; holocene; mammalia; man; pleistocene; south america es
dc.subject Tortugas es
dc.subject Biología es
dc.subject Mamíferos es
dc.title The Broken Zig-Zag: Late Cenozoic large mammal and tortoise extintion in South America es
dc.type Articulo es
sedici.creator.person Tonni, Eduardo Pedro es
sedici.creator.person Cione, Alberto Luis es
sedici.creator.person Soibelzon, Leopoldo Héctor es
sedici.subject.materias Paleontología es
sedici.subject.materias Ciencias Naturales es
sedici.description.fulltext true es
mods.originInfo.place Museo de La Plata es
sedici.subtype Articulo es
sedici.rights.license Creative Commons Attribution-NonCommercial 3.0 Unported (CC BY-NC 3.0)
sedici.rights.uri http://creativecommons.org/licenses/by-nc/3.0/
sedici.description.peerReview peer-review es
sedici2003.identifier ARG-UNLP-ART-0000007940 es
sedici.relation.journalTitle Revista del Museo Argentino de Ciencias Naturales es
sedici.relation.journalVolumeAndIssue vol. 5, no. 1 es


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Creative Commons Attribution-NonCommercial 3.0 Unported (CC BY-NC 3.0) Except where otherwise noted, this item's license is described as Creative Commons Attribution-NonCommercial 3.0 Unported (CC BY-NC 3.0)