The K-T and Tertiary-Pleistocene South American mammalian turnovers: similar phenomena?

The history of South American mammals has been episodic, apparently "stratified", and the "strata" relatively few in number and, as a rule, sharply and clearly separable. This is a consequence of the physical history of the continent. The fossil record shows that there were two g...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Pascual, Rosendo, Balarino, María Lucía, Udrizar Sauthier, Daniel Edgardo
Formato: Articulo
Lenguaje:Inglés
Publicado: 2001
Materias:
Paleontología
South American land-mammals
K-T. Tertiary-Pleistocene
Dispersal
Turnover
Extinction
Survival
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/117178
https://www.peapaleontologica.org.ar/index.php/peapa/article/view/234
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-117178
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Paleontología
South American land-mammals
K-T. Tertiary-Pleistocene
Dispersal
Turnover
Extinction
Survival
spellingShingle Paleontología
South American land-mammals
K-T. Tertiary-Pleistocene
Dispersal
Turnover
Extinction
Survival
Pascual, Rosendo
Balarino, María Lucía
Udrizar Sauthier, Daniel Edgardo
The K-T and Tertiary-Pleistocene South American mammalian turnovers: similar phenomena?
topic_facet Paleontología
South American land-mammals
K-T. Tertiary-Pleistocene
Dispersal
Turnover
Extinction
Survival
description The history of South American mammals has been episodic, apparently "stratified", and the "strata" relatively few in number and, as a rule, sharply and clearly separable. This is a consequence of the physical history of the continent. The fossil record shows that there were two great episodes characterized by drastic turnovers of mammal communities; both appear related to two of the most drastic physical changes withstood by the continent. The oldest episode is related to the separation of Africa from the other Gondwanan continents (shaping the primordial outlines of the eastern cost of the incipient Southern Atlantic Ocean), and to a sporadic connection of the South American plate with the North American plate. This led to the first great turnover: with the exception of two Gondwanan taxa (Monotremes and Gondwanatheres), and probably another one (Dryolestida), all the Gondwanan mammals (all non-tri- bosphenic taxa) became extinct, and were "replaced" by Laurasian tribosphenic marsupial and placental immigrants. Because of the early extinction (early Paleocene) of the Gondwanan non-tribosphenic survivors, and the subsequent isolation of the continent (including, at least, the Antarctic Peninsula) unique communities solely composed of quite endemic (native) marsupials and placentals were built up. As a consequence of the inter-American connection via the newborn Central America, an increasing biotic interchange began. The second great turnover, involving dispersal, extinction and survival, built up quite peculiar mammalian communities. These are the new basic mammal communities that, after the "Megafaunal Extinction" and the addition of a few and selected immigrants, distinguish the present Neotropical Region. Apparently this second great turnover was accomplished by replacement, not by displacement, as long thought. The failure to find mammals in rocks representing the K-T transition, has no record to analyze the modus operandi of the transcendental first turnover.
format Articulo
Articulo
author Pascual, Rosendo
Balarino, María Lucía
Udrizar Sauthier, Daniel Edgardo
author_facet Pascual, Rosendo
Balarino, María Lucía
Udrizar Sauthier, Daniel Edgardo
author_sort Pascual, Rosendo
title The K-T and Tertiary-Pleistocene South American mammalian turnovers: similar phenomena?
title_short The K-T and Tertiary-Pleistocene South American mammalian turnovers: similar phenomena?
title_full The K-T and Tertiary-Pleistocene South American mammalian turnovers: similar phenomena?
title_fullStr The K-T and Tertiary-Pleistocene South American mammalian turnovers: similar phenomena?
title_full_unstemmed The K-T and Tertiary-Pleistocene South American mammalian turnovers: similar phenomena?
title_sort k-t and tertiary-pleistocene south american mammalian turnovers: similar phenomena?
publishDate 2001
url http://sedici.unlp.edu.ar/handle/10915/117178
https://www.peapaleontologica.org.ar/index.php/peapa/article/view/234
work_keys_str_mv AT pascualrosendo thektandtertiarypleistocenesouthamericanmammalianturnoverssimilarphenomena
AT balarinomarialucia thektandtertiarypleistocenesouthamericanmammalianturnoverssimilarphenomena
AT udrizarsauthierdanieledgardo thektandtertiarypleistocenesouthamericanmammalianturnoverssimilarphenomena
AT pascualrosendo ktandtertiarypleistocenesouthamericanmammalianturnoverssimilarphenomena
AT balarinomarialucia ktandtertiarypleistocenesouthamericanmammalianturnoverssimilarphenomena
AT udrizarsauthierdanieledgardo ktandtertiarypleistocenesouthamericanmammalianturnoverssimilarphenomena
bdutipo_str Repositorios
_version_ 1764820446963826690

Ejemplares similares