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Abstract:

The biogeographic hypothesis more accepted today is that Antarctica (West Antarctica) and southern South America (Magellan region, Patagonia) were connected by a long and narrow causeway (Weddellian Isthmus) between the Antarctic Peninsula and South America since the Late Cretaceous (Campanian) until the Early Paleogene allowing terrestrial vertebrates to colonize new frontiers using this land bridge. Stratigraphically calibrated phylogenies including large, terrestrial native ungulates Litopterna and Astrapotheria taxa reveal long ghost lineages that extended into the Late Paleocene and provide evidence for the minimum times at which these "native ungulates" were present both on Antarctica and South America. Based on these results we estimate that the Weddellian Isthmus was functional as a land bridge until the Late Paleocene. Our data place the disconnection between Antarctica and South America in the Late Paleocene, indicating that the terrestrial faunistic isolation (Simpson's "splendid isolation") in South America begun at the end of the Paleocene (~ 56 to 57 m.y.). This faunistic isolation is documented to have occurred at least 25. Ma before the existence of deep-water circulation conditions in Drake Passage (~ 30 m.y.) based on the onset of seafloor spreading in the west Scotia Sea region. We hypothesize that in the early stages of extension (Late Paleocene, ~ 55 m.y.) a wide and relatively shallow epicontinental sea developed between the Antarctic Peninsula and South America drowning the Weddellian Isthmus and preventing the faunal interchange for obligate cursorial terrestrial forms. © 2014 Elsevier B.V.

Registro:

Documento: Artículo
Título:Final Gondwana breakup: The Paleogene South American native ungulates and the demise of the South America-Antarctica land connection
Autor:Reguero, M.A.; Gelfo, J.N.; López, G.M.; Bond, M.; Abello, A.; Santillana, S.N.; Marenssi, S.A.
Filiación:Instituto Antártico Argentino, Balcarce 290, Buenos Aires, C1064AAF, Argentina
División Paleontología de Vertebrados, Museo de La Plata, Paseo del Bosque s/n, La Plata, Buenos Aires, B1900FWA, Argentina
LASBE, Museo de La Plata, Paseo del Bosque s/n, La Plata, Buenos Aires, B1900FWA, Argentina
IGEBA Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires, Ciudad Universitaria, Pabellón II, Núñez, CABA, Buenos Aires, Argentina
CONICET, CABA, Buenos Aires, Argentina
Palabras clave:Early Paleogene; Land connection; South America; South American and Antarctic native ungulate; West Antarctica; Antarctic Peninsula; Gondwana breakups; Paleogene; Seafloor spreading; South America; South American and Antarctic native ungulate; Southern south america; West antarctica; Bridges; Astrapotheria; Litopterna; Ungulata; Vertebrata; Weddellia
Año:2014
Volumen:123
Página de inicio:400
Página de fin:413
DOI: http://dx.doi.org/10.1016/j.gloplacha.2014.07.016
Título revista:Global and Planetary Change
Título revista abreviado:Global Planet. Change
ISSN:09218181
CODEN:GPCHE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09218181_v123_n_p400_Reguero

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Citas:

---------- APA ----------
Reguero, M.A., Gelfo, J.N., López, G.M., Bond, M., Abello, A., Santillana, S.N. & Marenssi, S.A. (2014) . Final Gondwana breakup: The Paleogene South American native ungulates and the demise of the South America-Antarctica land connection. Global and Planetary Change, 123, 400-413.
http://dx.doi.org/10.1016/j.gloplacha.2014.07.016
---------- CHICAGO ----------
Reguero, M.A., Gelfo, J.N., López, G.M., Bond, M., Abello, A., Santillana, S.N., et al. "Final Gondwana breakup: The Paleogene South American native ungulates and the demise of the South America-Antarctica land connection" . Global and Planetary Change 123 (2014) : 400-413.
http://dx.doi.org/10.1016/j.gloplacha.2014.07.016
---------- MLA ----------
Reguero, M.A., Gelfo, J.N., López, G.M., Bond, M., Abello, A., Santillana, S.N., et al. "Final Gondwana breakup: The Paleogene South American native ungulates and the demise of the South America-Antarctica land connection" . Global and Planetary Change, vol. 123, 2014, pp. 400-413.
http://dx.doi.org/10.1016/j.gloplacha.2014.07.016
---------- VANCOUVER ----------
Reguero, M.A., Gelfo, J.N., López, G.M., Bond, M., Abello, A., Santillana, S.N., et al. Final Gondwana breakup: The Paleogene South American native ungulates and the demise of the South America-Antarctica land connection. Global Planet. Change. 2014;123:400-413.
http://dx.doi.org/10.1016/j.gloplacha.2014.07.016