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• W2040229939 abstract "Quaternary molluscs are useful tools as indicators of environmental and climatic changes through time. The Patagonian coastal area exhibits a series of Quaternary marine terraces (MT) at various elevations with a well-preserved molluscan fauna. The assemblages from Mid– to Late Pleistocene and Holocene raised beach deposits exposed between Bahía Vera and Bahía Camarones (44.2°S–45°S) were examined, and systematic, palaeoecological and palaeobiogeographical aspects were reviewed and updated in terms of interpretation of the littoral area and biotic responses to climate changes. Collections at 10 fossiliferous localities and four modern sites of the adjacent nearshore show that molluscs (41 taxa: 24 gastropods and 17 bivalves) represent 91% of the total faunal content. Identification of the typical taxa for at least four sea-level highstands was based on the occurrence, relative abundance, species richness, and diversity indices (Margaleff's; Sannon Weaver's). Variations between terraces MTIII (Camarones, higher than + 30 m, probably ca. 400 ka), IV (Punta Pescadero and Camarones,+ 22–29 m, 178–239 ka), V (Bahía Vera, Punta Pescadero, Camarones,+ 16–18 m, 92–135 ka) and VI (Punta Lobería, Punta Pescadero, Camarones,+ 6–12 m, 2.5–8 ka) add to a better understanding of palaeoenvironments and palaeoclimates linked to sea-level highstands since MOIS11. Their original habitat was typical of rocky-shore, high-energy and euhaline waters, similar to the modern conditions of adjacent benthic communities. The most characteristic taxa are: Patinigera deaurata (Gm.), Fissurella spp., Crepidula protea d'Orb., C. aculeata (Gm.), C. cf. unguiformis Lam., Natica isabelleana d'Orb., Trochita pileus (Lam.), Buccinanops spp., Pareuthria plumbea (Philippi), Acanthina monodon (Pallas) and Trophon spp. (Gastropoda); Brachidontes purpuratus (Lam.), Protothaca antiqua (King), Clausinella gayi (Hupé), Mactra aff. patagonica (d'Orb.) and Ostrea tehuelcha (Feruglio). New records in this area for the Late Pleistocene are: C. aculeata (Gm.), C. onyx Sow., C. protea d'Orb., T. patagonica (d'Orb.), N. isabelleana (d'Orb.), B. rodriguezi (d'Orb.), A. tehuelchus (d'Orb.) and C. gayi (Hupé). Ostrea tehuelcha d'Orb. became extinct and Tegula atra (Lesson), N. isabelleana (d'Orb.), B. rodriguezi (d'Orb.), C. patagonica (d'Orb.) and D. vilardeboana (d'Orb.) migrated into the area. Exclusive for MTIII (MOIS11) are Pectinidae indet., Ostrea tehuelcha and Mactra cf. patagonica d'Orb. which, together with other taxa (i.e., Corbula patagonica, Diplodonta vilardeboana), suggest warmer sea surface temperature (SST) than at present. Typical of MTIV (MOIS7) are T. atra, biggest P. antiqua (King), and Veneroida indet. The assemblage from MTV (MOIS5c?, 5a?), T. atra, T. patagonica, C. dilatata Lamk., M. edulis Linn., B. purpuratus, P. antiqua, and P. rostratus (Koch), is not indicative of a climatic optimum and thus of the Last Interglacial maximum highstand (MOIS5e). MTVI (MOIS1) is characterized by B. cf. purpuratus, N. (Patinigera) magellanica (Gm.), N. (P.) deaurata (Gm.), Trophon geversianus (Pallas), B. purpuratus, and Aulacomya atra (Molina). N. delicatissima (Strebel), Chlamys sp., Panopea abbreviata, and Lyonsia sp. exclusively occur in the modern nearshore. According to the global isotope curve, MOIS5e highstand (125 ka BP) was the warmest since the Mid-Pleistocene. The innermost MTIII assemblage provides an opportunity to hypothesize that along the eastern coast of South America the corresponding highstand (probably MOIS11, ca. 400 ka BP ?) belongs to the warmest of the Pleistocene interglacials preserved, as proposed earlier for the Chilean coast (Ortlieb et al., 1996). This assemblage could be correlated with the Belgranense of the Bonaerensian littoral. The Holocene Climatic Optimum (5–8 ka) is confirmed to have influenced the littoral biota. A slightly higher SST (1–3 °C) implied atmospheric and palaeoceanographic changes, with a southwards shift of the dominant warm (Brazilian) and cool (Malvinas = Falkland) currents along the SWAtlantic and, consequently, of the Argentinean and Magellanean marine zoogeographical provinces." @default.
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• W2040229939 date "2006-01-01" @default.
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• W2040229939 title "Palaeoenvironments and palaeoclimates of the Quaternary molluscan faunas from the coastal area of Bahía Vera-Camarones (Chubut, Patagonia)" @default.
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• W2040229939 doi "https://doi.org/10.1016/j.palaeo.2005.06.025" @default.
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