Biogeography of the Quaternary Molluscs of the Southwestern Atlantic Ocean.pdf

Biogeography of the Quaternary Molluscs of the Southwestern Atlantic Ocean

Sergio Martínez

The Quaternary comprises a brief time in the Earths history, and apart from a few exceptions, molluscan assemblages recovered from exposures along the coast of Southwestern South America (Southern Brazil, Uruguay, Argentina) are essentially the same than those that inhabit the region today, leading to the assumption that no important change in the distribution of the faunas since Pleistocene times has occurred. However, the good taxonomic and temporal resolution reached in the last years, allowed us to detect some biogeographic changes, although traditional biogeographic units remain the same (i.e. Magellanic and Argentinean Provinces). These modifications involve mainly variations in the taxonomic composition of the assemblages and in the southern boundaries of some species distributions (extralimital species), today retracted northwards. These changes are related to southward shifts of the warm waters of the Brazilian Current, correlated with global warm peaks. This phenomenon was more intense in the Late Pleistocene (MIS 5e) and in the Holocene between ca. 6500-3500 14C yr.

The mid Atlantic barrier (MAB) is a deep ocean gap formed by the Atlantic Ocean basin in the last 85 Myr. It spans a long distance with a minimum straight-line distance of approximately 2800 km, therefore acting as a barrier to larval dispersal for marine organisms (Floeter et al., 2008; Luiz et al., 2011). Marine Species Identification Portal : Limacina …

4.59 MB DATEIGRÖSSE
9400760558 ISBN
Englisch SPRACHE
Biogeography of the Quaternary Molluscs of the Southwestern Atlantic Ocean.pdf

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