Holocene benthic foraminifera from Bahía Blanca estuary: a review and update of systematic and palaeoenvironmental aspects

Cusminsky, Gabriela Catalina; Bernasconi, Emiliana; Calvo-Marcilese, Lydia

doi:10.1177/0959683609345085

Cited by 22 publications

(32 citation statements)

References 28 publications

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“…They are most common at the bottom of clear lakes, usually forming extensive growths (Lee, 2008). Several studies applying these groups in paleoenvironmental reconstructions have been carried out on the Pampa coastal plain (Bertels & Martínez, 1990, 1997Laprida & Bertels-Psotka, 2003;Fontana, 2004;Gómez et al, 2005Gómez et al, , 2006Laprida et al, 2007;Cusminsky et al, 2009;Ferrero, 2006Ferrero, , 2009Marquez & Ferrero, 2011;Calvo-Marcilese et al, 2011.…”

Section: Introductionmentioning

confidence: 99%

Holocene palaeoenvironmental evolution of the Pampa coastal plain (Argentina) based on calcareous microfossils

Márquez¹,

Ferrero²,

Cusminsky³

2016

Rev. bras. paleontol.

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In the present contribution, we studied assemblages of benthic foraminifers, ostracods and charophytes in a Holocene outcrop in the southeast of the La Pampa coastal plain in Argentina. The main species recorded were Spirillina sp. A, Buccella peruviana, Ammonia parkinsoniana, A. tepida, Elphidium margaritaceum and E. gunteri among foraminifers, Limnocythere cusminskyae and Cyprideis salebrosa among ostracods. These species allowed to determine restricted environments characterized by signifi cant changes in salinity. Qualitative and quantitative studies conducted on the faunal content in the outcrop allowed to identify four environments closely linked to the sea-level changes occurred during the Holocene. In a fi rst stage, between 7500-7200 and 6300-6200 cal yr BP represent the development of a non-marine environment. Around 6300-6200 cal yr BP this environment change to brackish-estuarine with moderate energy. Sometime before c. 6000-5700 cal yr BP a clear-water lagoon, probably oligohaline, with abundant submerged vegetation is inferred. In a fi nal stage, from 2300-2000 to 2000-1700 cal yr BP, a continental environment not infl uenced by the proximity of the sea was established. The new calcareous microfossils evidences and the new chronologies provided by this work, allowed us to adjust the moment of the maximum sea level rise during the Holocene transgression and contribute to a better knowledge of the evolution of coastal paleoenvironments in relation to sea level changes.RESUMO -Na presente contribuição foram estudadas assembleias de foraminíferos bentônicos, ostracodes e carófi tas num afl oramento localizado a sudeste da planície costeira de La Pampa, Argentina. As principais espécies registradas foram Spirillina sp. A, Buccella peruviana, Ammonia parkinsoniana, A. tepida, Elphidium margaritaceum e E. gunteri entre os foraminíferos, Limnocythere cusminskyae e Cyprideis salebrosa entre os ostracodes. Estas espécies permitiram determinar ambientes restritos, caracterizados por alterações signifi cativas na salinidade. Estudos faunísticos qualitativos e quantitativos conduziram à identifi cação de quatro ambientes estreitamente relacionados às mudanças no nível do mar que ocorreram durante o Holoceno. No primeiro estágio, entre 7500-7200 e 6300-6200 cal. anos AP, foi identifi cado o desenvolvimento de um ambiente não marinho. Em torno de 6300-6200 cal. anos AP o ambiente se transforma num estuário salobro com níveis moderados de energia. Algum tempo antes c. 6000-5700 cal. anos AP desenvolveu-se um ambiente lagunar de águas claras, provavelmente oligohalino, com abundante vegetação submersa. Em um estágio fi nal, entre 2300-2000 e 2000-1700 cal. anos AP, estabeleceu-se um ambiente continental sem infl uencia marinha. Novas evidências trazidas pelos microfósseis calcários e as novas cronologias fornecidas por este estudo, permitiu ajustar o momento de máxima elevação do nível do mar durante a transgressão holocênica e contribuir para um melhor conhecimento da evolução dos paleoambientais costeiros em relaç...

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Section: Introductionmentioning

confidence: 99%

Holocene palaeoenvironmental evolution of the Pampa coastal plain (Argentina) based on calcareous microfossils

Márquez¹,

Ferrero²,

Cusminsky³

2016

Rev. bras. paleontol.

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“…Examination of subsurface sediment and core data clearly indicate, however, that the species was absent from the estuary for at least the last 8,200 years BP (Calvo-Marcilese unpublished data; Cusminsky et al 2009). In addition, large-scale comprehensive surveys of recent benthic foraminifera showed that H. germanica has never been reported in modern environments along the southwestern Atlantic coast of Argentina and Brazil (summarized in Boltovskoy et al 1980).…”

Section: Discussionmentioning

confidence: 96%

Breaching biogeographic barriers: the invasion of Haynesina germanica (Foraminifera, Protista) in the Bahía Blanca estuary, Argentina

Calvo-Marcilese

Langer

2010

Biol Invasions

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Large populations of the living benthic foraminifera Haynesina germanica (Ehrenberg 1840) are reported for the first time from marsh and intertidal mud flat sediments of the Bahía Blanca estuary (Argentina). Maximum abundance of living specimens was recorded in shallow intertidal environments. The species was previously recorded from many European and North American shallow-water coastal settings, but has not been documented from Argentina. Comparative faunal assemblage analysis from dated core sample material from within the Bahía Blanca estuary shows that the species has not been present for at least the last 8,200 years. This supports the hypothesis that the species has been accidentally introduced outside its natural range as a probable result of ballast water and/or shipping activities. This study is the first report of a successful invasion of nonindigenous benthic foraminifera to the South Atlantic coast of Argentina. The introduction of nonnative foraminiferal species provides new evidence that human-mediated breaching of biogeographic barriers, will ultimately result in the biotic homogenization of foraminiferal intertidal faunal assemblages.

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“…Oscilaciones entre los cal. 2.700-2.330 años AP y entre los cal 4100-3750 años AP aproximadamente, fueron reconocidas en Brasil (Martin et al, 2003; entre otros), mientras que en el área de Bahía Blanca, Argentina, Gómez et al (2005bGómez et al ( , 2006 y Cusminsky et al (2009) reconocen oscilaciones del NMM por debajo del actual para los cal. 7.300-6.600 años AP (A) y los cal.…”

Section: Cambios Del Nivel Medio Del Mar Durante El Holoceno En El Esunclassified

Asociaciones de ostrácodos bentónicos actuales y del Holoceno del estuario de Bahía Blanca (Buenos Aires, Argentina): interpretaciones paleoambientales

Kihn¹,

Martínez²,

Gómez³

et al. 2017

Rev. bras. paleontol.

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-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 present 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 identify palaeoenvironments and to provide new evidence of negative fluctuations of the mean sea level for the Holocene.

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Holocene benthic foraminifera from Bahía Blanca estuary: a review and update of systematic and palaeoenvironmental aspects

Cited by 22 publications

References 28 publications

Holocene palaeoenvironmental evolution of the Pampa coastal plain (Argentina) based on calcareous microfossils

Holocene palaeoenvironmental evolution of the Pampa coastal plain (Argentina) based on calcareous microfossils

Breaching biogeographic barriers: the invasion of Haynesina germanica (Foraminifera, Protista) in the Bahía Blanca estuary, Argentina

Asociaciones de ostrácodos bentónicos actuales y del Holoceno del estuario de Bahía Blanca (Buenos Aires, Argentina): interpretaciones paleoambientales

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