By Sergio Martínez, Claudia J. del Río, Alejandra Rojas
The Quaternary contains a quick time within the Earth’s historical past, and except a number of exceptions, molluscan assemblages recovered from exposures alongside the coast of Southwestern South the US (Southern Brazil, Uruguay, Argentina) are basically an identical than those who inhabit the zone at the present time, resulting in the belief that no very important swap within the distribution of the faunas due to the fact that Pleistocene instances has happened. despite the fact that, the nice taxonomic and temporal answer reached within the final years, allowed us to notice a few biogeographic adjustments, even though conventional biogeographic devices stay a similar (i.e. Magellanic and Argentinean Provinces). those alterations contain mostly adaptations within the taxonomic composition of the assemblages and within the southern obstacles of a few species distributions (extralimital species), this present day retracted northwards. those alterations are concerning southward shifts of the nice and cozy waters of the Brazilian present, correlated with worldwide hot peaks. This phenomenon was once extra severe within the overdue Pleistocene (MIS 5e) and within the Holocene among ca. 6500-3500 14C year.
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Additional resources for Biogeography of the Quaternary Molluscs of the Southwestern Atlantic Ocean
Quat Res 55:246–254. 2204 Martínez S, Rojas A, Ubilla M, Verde M, Perea D, Piñeiro G (2006) Molluscan assemblages from the marine Holocene of Uruguay: composition, geochronology and paleoenvironmental signals. Ameghiniana 43:385–398 Parodiz JJ (1962) Los moluscos marinos del Pleistoceno rioplatense. Com Soc Malac Uruguay 1:29–46 Chapter 7 Final Remarks The present paper records almost two-thirds more species in the Holocene than in the Pleistocene, as a consequence of three main factors: 1—the Pleistocene is under-represented, with a less number of recognized deposits than the Holocene; 2—the rather bad preservation of Pleistocene shells; 3—there are still many Pleistocene deposits that have not been yet numerically dated (surely proportionally more than Holocene ones), and for this reason, they were excluded from the analysis carried out herein.
More fine-tuning works are needed to elucidate whether the paleoclimatic information provided by molluskan faunas reflects the same results that could be reached through the studies of other taxonomic groups or using different methodologies. There is an important verification: the areas located in the extremes of the geographical distribution of species have not extralimital species. This is the case of Rio de Janeiro, San Jorge Gulf and Tierra del Fuego during the Holocene, and also of Tierra del Fuego during Pleistocene times (there are no exposures from Uruguay to areas situated northwards during the Pleistocene).
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