Distribution of diatoms and mollusks in shallow lakes from the semiarid Pampa region, Argentina: Their relative paleoenvironmental significance

Hassan, Gabriela S.; Francesco, Claudio G. De; Peretti, V.

doi:10.1016/j.jaridenv.2011.11.002

Cited by 14 publications

(23 citation statements)

References 28 publications

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“…year B.P. ); however, when in freshwater, it is usually accompanied by other mollusk species (De Francesco and Hassan 2009;Tietze and De Francesco 2010;Hassan et al 2012). The continuous dominance of this euryhaline species all along the successions brings support to the hypothesis that these lakes were unstable environments, even since their origin, subject to episodic variations in salinity.…”

Section: Evolution Of Molluscan Assemblagesmentioning

confidence: 69%

“…This species is also present in semiarid regions of Argentina, being the only mollusk inhabiting brackish shallow lakes (De Francesco and Hassan 2009;Hassan et al 2012). Heleobia parchappii can inhabit both vegetated and nonvegetated lakes, exhibiting a high ecological plasticity.…”

Section: Modern Molluscan Faunasmentioning

confidence: 99%

“…The species can inhabit both lotic and lentic water bodies where plants occur, and it is distributed both in the humid and semiarid Pampas (Tietze et al 2010;Hassan et al 2012). This is a freshwater species that cannot tolerate significant increases in water conductivity.…”

Section: Evolution Of Molluscan Assemblagesmentioning

confidence: 99%

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Mollusk Successions of Holocene Shallow-Lake Deposits From the Southeastern Pampa Plain, Argentina

Francesco

Tietze

Cristini

2014

PALAIOS

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We analyzed variations in taxonomic composition, abundance, and preservation of freshwater mollusks during the mid-to late Holocene in three shallow lakes of the southeastern Pampa plain. Mollusks were obtained from core samples (110-140 cm long) from the deepest part of the lakes, and sampled at 1 cm intervals. Six species were identified: Heleobia australis, Heleobia parchappii, Biomphalaria peregrina, Uncancylus concentricus, Succinea meridionalis, and Antillorbis nordestensis. Assemblages were dominated by H. parchappii, which displayed continuous and complete records in the three sections. With the exception of H. australis, fossil assemblages were represented by the same species that today inhabit Pampean lakes and preserved the same rank order of abundance as modern communities. A similar pattern of variation in mollusk assemblage composition was recognized in the three successions, which initiated prior to circa 6000 cal. year B.P, with assemblages composed of H. parchappii and S. meridionalis at low abundances. A broad expansion of H. parchappii occurred between circa 6000 and 5400 cal. year B.P., and the species rapidly dominated the whole malacofauna. At circa 5400 cal. year B.P., the freshwater B. peregrina was recorded for the first time, and its abundance gradually increased until circa 3600 cal. year B.P. At ,3700 cal. year B.P., the estuarine H. australis was recorded. The arrival of the freshwater U. concentricus occurred at ,1697 cal. year B.P. Finally, only H. parchappii and B. peregrina were represented in the topmost levels (younger than ,736 cal. year B.P.). Changes in mollusk composition were mostly related to changes in water salinity, which brings a historical perspective to understanding the modern dominance of the euryhaline H. parchappii in these lakes. Shell preservation became favored when water bodies developed brackish conditions.

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Section: Evolution Of Molluscan Assemblagesmentioning

confidence: 69%

Section: Modern Molluscan Faunasmentioning

confidence: 99%

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Mollusk Successions of Holocene Shallow-Lake Deposits From the Southeastern Pampa Plain, Argentina

Francesco

Tietze

Cristini

2014

PALAIOS

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“…H. parchappii is present throughout this profile. This species lives in environments with different characteristics, being tolerant to different ranges of salinity (De Francesco and Hassan, 2009;Tietze and De Francesco, 2010;Hassan et al, 2012). However, it is very useful as a paleoenvironmental indicator, depending on whether its presence in the assemblages is exclusive or together with other species (De Francesco and Isla, 2003;De Francesco and Hassan, 2009).…”

Section: Buena Vista De Guerreromentioning

confidence: 99%

“…Recently, some exploratory studies have been performed (e.g. Ciocco and Scheibler, 2008;De Francesco and Hassan, 2009;Seuffert et al, 2010;Tietze and De Francesco, 2010;Tietze et al, 2011;Hassan et al, 2012;Seuffert and Martín, 2013) providing new insights into the usefulness of molluscs as paleobioindicators. The environmental information gathered on modern communities can be extrapolated into the fossil record (De Francesco, 2013), where the same species are represented.…”

Section: Introductionmentioning

confidence: 99%

Quaternary mollusc assemblages from the lower basin of Salado River, Buenos Aires Province: Their use as paleoenvironmental indicators

Pisano

Fucks²

2016

Quaternary International

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Actualistic Taphonomy of Freshwater Diatoms: Implications for the Interpretation of the Holocene Record in Pampean Shallow Lakes

Hassan

Francesco

Díaz

2019

Topics in Geobiology

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Distribution of diatoms and mollusks in shallow lakes from the semiarid Pampa region, Argentina: Their relative paleoenvironmental significance

Cited by 14 publications

References 28 publications

Mollusk Successions of Holocene Shallow-Lake Deposits From the Southeastern Pampa Plain, Argentina

Mollusk Successions of Holocene Shallow-Lake Deposits From the Southeastern Pampa Plain, Argentina

Quaternary mollusc assemblages from the lower basin of Salado River, Buenos Aires Province: Their use as paleoenvironmental indicators

Actualistic Taphonomy of Freshwater Diatoms: Implications for the Interpretation of the Holocene Record in Pampean Shallow Lakes

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