By Sergio Martínez, Claudia J. del Río, Alejandra Rojas
The Quaternary includes a short time within the Earth’s background, and except a couple of exceptions, molluscan assemblages recovered from exposures alongside the coast of Southwestern South the US (Southern Brazil, Uruguay, Argentina) are basically an analogous than those who inhabit the quarter this present day, resulting in the idea that no very important swap within the distribution of the faunas considering that Pleistocene occasions has happened. notwithstanding, the great taxonomic and temporal answer reached within the final years, allowed us to become aware of a few biogeographic adjustments, even though conventional biogeographic devices stay a similar (i.e. Magellanic and Argentinean Provinces). those alterations contain typically adaptations within the taxonomic composition of the assemblages and within the southern limitations of a few species distributions (extralimital species), this day retracted northwards. those adjustments are concerning southward shifts of the nice and cozy waters of the Brazilian present, correlated with worldwide hot peaks. This phenomenon used to be extra excessive within the past due Pleistocene (MIS 5e) and within the Holocene among ca. 6500-3500 14C 12 months.
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Additional info for Biogeography of the Quaternary Molluscs of the Southwestern Atlantic Ocean
004 1 Although we have integrated the information from Northern Santa Cruz Province (San Jorge Gulf area), it is important to keep in mind that Aguirre et al. (2009) did not found temperature differences between the fossil and recent mollusks in this zone. The estimations obtained in the present work indicate that, in general, temperatures were warmer than at present, as suggested for local areas by Feruglio (1950), Figueiras (1962), Forti-Esteves (1969), Aguirre (1993), Martínez (1988, 1990), Martínez and del Río (2005), Martínez et al.
Pp 13–26 Martínez S, Ubilla M, Verde M, Perea D, Rojas A, Guérèquiz R, Piñeiro G (2001) Paleoecology and geochronology of uruguayan coastal marine Pleistocene deposits. 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.
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