ASOCIACIONES DE OSTRÁCODOS BENTÓNICOS ACTUALES Y DEL HOLOCENO DEL ESTUARIO DE BAHÍA BLANCA (BUENOS AIRES, ARGENTINA): INTERPRETACIONES PALEOAMBIENTALES

KIHN, ROMINA G; MARTÍNEZ, DINA E.; GÓMEZ, EDUARDO A.; BOREL, MARCELA C.

REVISTA BRASILEIRA DE PALEONTOLOGIA

SOC BRASILEIRA PALEONTOLOGIA

Lugar: Porto Alegre; Año: 2016 p. 465 - 480

1519-7530

ABSTRACT: RECENT AND HOLOCENE BENTHIC OSTRACOD ASSEMBLAGES OF THE BAHIA BLANCA ESTUARY: (BUENOS AIRES, ARGENTINA): PALAEOENVIRONMENTAL INTERPRETATIONS. The study of ostracod fauna in sediment samples from current environments at the Bahía Blanca estuary led to the identification of different ostracod associations, through which it was possible to identify Holocene depositional environments. Based on the systematic analysis of the ostracods present in different core levels, a total of 11 genera represented by 13 species of benthic ostracods were identified, out of which Neocytherideis ruidis, Loxocythere variasculpta and Callistocythere litoralensis were dominant along the core. The quantitative and qualitative analysis of ostracods from the Holocene allowed us to determine the following palaeoenvironments: at the base of the core the sediments were deposited in an intertidal environment with developed mudflats; the middle sector evidenced an increase in environmental energy; and the upper portion of the core contained deposits of marshes environment with greater freshwater input. The detailed study of the benthic ostracoda allowed to establish palaeoenvironments and provide new evidence of negative fluctuations mean sea level for the Holocene.Key words: ostracods, estuary, Bahía Blanca, palaeoenvironment, Argentina