气候变化领域集成服务门户(CCPortal): Population response during an Oceanic Anoxic Event: The case of Posidonotis (Bivalvia) from the Lower Jurassic of the Neuquén Basin; Argentina

CCPortal

DOI	10.1016/j.palaeo.2019.04.009
	Population response during an Oceanic Anoxic Event: The case of Posidonotis (Bivalvia) from the Lower Jurassic of the Neuquén Basin; Argentina
	Ros-Franch S.; Echevarría J.; Damborenea S.E.; Manceñido M.O.; Jenkyns H.C.; Al-Suwaidi A.; Hesselbo S.P.; Riccardi A.C.
发表日期	2019
ISSN	0031-0182
起始页码	57
结束页码	67
卷号	525
英文摘要	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 carbon-isotope 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. © 2019 Elsevier B.V.
英文关键词	Biotic reactions; Opportunistic species; Paper-clams; South America; Toarcian OAE
语种	英语
scopus关键词	abundance; adaptation; anoxic conditions; aquatic organism; benthos; bivalve; chemostratigraphy; extinction; fossil record; Jurassic; mortality; Pliensbachian; reproductive strategy; seawater; Toarcian; total organic carbon; type locality; Argentina; Neuquen Basin; Bivalvia
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150960
作者单位	División Paleozoología de Invertebrados, Museo de La Plata, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Paseo del Bosque s/n, La Plata, A1900FWA, Argentina; Department of Earth Sciences, University of Oxford, South Parks Road, Oxford, OX1 3AN, United Kingdom; Department of Earth Sciences, Khalifa University of Science and Technology, PO Box 127788, Abu Dhabi, United Arab Emirates; Camborne School of Mines and Environment and Sustainability Institute, University of Exeter, Penryn Campus, Penryn, Cornwall, TR10 9FE, United Kingdom
推荐引用方式 GB/T 7714	Ros-Franch S.,Echevarría J.,Damborenea S.E.,et al. Population response during an Oceanic Anoxic Event: The case of Posidonotis (Bivalvia) from the Lower Jurassic of the Neuquén Basin; Argentina[J],2019,525.
APA	Ros-Franch S..,Echevarría J..,Damborenea S.E..,Manceñido M.O..,Jenkyns H.C..,...&Riccardi A.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.
MLA	Ros-Franch S.,et al."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(2019).