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Population response during an Oceanic Anoxic Event: The case of Posidonotis (Bivalvia) from the Lower Jurassic of the Neuquén Basin, Argentina

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Population response during an Oceanic Anoxic Event: The case of Posidonotis (Bivalvia) from the Lower Jurassic of the Neuquén Basin, Argentina

dc.contributor.author	Ros Franch, Sonia
dc.contributor.author	Echevarría, Javier
dc.contributor.author	Damborenea, Susana E.
dc.contributor.author	Manceñido, Miguel
dc.contributor.author	Jenkyns, Hugh C.
dc.contributor.author	Al-Suwaidi, Aisha
dc.contributor.author	Hesselbo, Stephen P.
dc.contributor.author	Riccardi, Alberto C.
dc.date.accessioned	2021-09-23T12:55:51Z
dc.date.available	2021-09-23T12:55:51Z
dc.date.issued	2019
dc.identifier.citation	Ros Franch, Sonia Echevarría, Javier Damborenea, Susana E. Manceñido, Miguel Jenkyns, Hugh C. Al-Suwaidi, Aisha Hesselbo, Stephen P. Riccardi, Alberto C. 2019 Population response during an Oceanic Anoxic Event: The case of Posidonotis (Bivalvia) from the Lower Jurassic of the Neuquén Basin, Argentina Palaeogeography Palaeoclimatology Palaeoecology 525 57 67
dc.identifier.uri	https://hdl.handle.net/10550/80349
dc.description.abstract	Benthonic marine species show a wide range of biological reactions to seawater chemical changes through time, from subtle adjustments to extinction. The Early Toarcian Oceanic Anoxic Event (T-OAE) was recently recognized in the Neuquén Basin, Argentina, confirming its global scope. The event was identified chemostratigraphically on the basis of a relative increase in marine organic carbon and a characteristic negative carbonisotope excursion (δ13Corg) in bulk rock and fossil wood in the upper Pliensbachian-lower Toarcian interval in the Arroyo Lapa section (Neuquén). Simultaneously with collection of lithological samples, a high-resolution biostratigraphical survey was carried out, and the scarce benthonic fauna was collected in order to check the biotic response to changing marine geochemical conditions. We present here an analysis of size and abundance data from the T-OAE interval in the Neuquén Basin for the dominant bivalve species, the paper-clam Posidonotis cancellata (Leanza), and relate these data to geochemical proxies (%TOC and δ13Corg) obtained at the same locality. The abundance of P. cancellata increased when the rest of the benthos diminished, reaching a maximum at the onset level of the T-OAE, and then decreasing. Size-frequency distributions show a noteworthy lack of juvenile shells. Shell size shows a positive correlation with %TOC in the whole section, though over the T-OAE interval proper, it decreases below the level where the maximum %TOC value is attained and increases above it. Posidonotis cancellata shows features of opportunistic species, such as high tolerance to hypoxia, strong dominance in impoverished environments and a strong dependence on primary productivity, but at the same time had a reproductive strategy more similar to equilibrium species, with relatively low juvenile mortality rates. Several anatomical features suggest adaptation to permanently dysaerobic environments. The species disappeared just before the minimum negative carbon-isotope value was reached; and by the same time the genus became extinct worldwide.
dc.language.iso	eng
dc.relation.ispartof	Palaeogeography Palaeoclimatology Palaeoecology, 2019, vol. 525, p. 57-67
dc.subject	Cronologia geològica
dc.subject	Paleontologia
dc.subject	Espècies (Biologia)
dc.title	Population response during an Oceanic Anoxic Event: The case of Posidonotis (Bivalvia) from the Lower Jurassic of the Neuquén Basin, Argentina
dc.type	journal article	es_ES
dc.date.updated	2021-09-23T12:55:52Z
dc.identifier.doi	10.1016/j.palaeo.2019.04.009
dc.identifier.idgrec	146991
dc.rights.accessRights	open access	es_ES