New fossil bird remains from the Chichinales Formation (Early Miocene) of northern Patagonia, Argentina

Agnolín, Federico; Chafrat, Pablo

doi:10.1016/j.annpal.2015.02.001

Cited by 15 publications

(5 citation statements)

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“…; Antoine et al . ), whereas litopterns were mainly medium‐sized to large mammals, with body masses from 10–50 kg (proterotheriids) to more than 100 kg (macraucheniids) (Cassini et al . ; Cassini ).…”

Section: Discussionmentioning

confidence: 99%

“…Data was compiled from PBDB (accessed 23 October 2015), EoL (accessed 24 October 2015), GBIF (accessed 26 October 2015) as well as other sources as follows: for North American carnivorans, Forasiepi et al . (); for phorusrhacids, Agnolin & Chafrat (), Alvarenga & Höfling (), Bertelli et al . () and Degrange et al .…”

Section: Methodsmentioning

confidence: 98%

“…However, among large non‐mammalian carnivores, the most extraordinary were the phorusrhacids, often given the common name of ‘terror birds’. These large carnivorous flightless birds were widespread in South America from 60.0 to 1.5 Ma and dispersed northward to colonize North America, Africa and Europe (Alvarenga & Höfling ; Agnolin & Chafrat ; Degrange et al . ).…”

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Extinction of South American sparassodontans (Metatheria): environmental fluctuations or complex ecological processes?

et al. 2016

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Sparassodontans are a diverse but now extinct group of metatherians that were apex predators in South America during most of the Cenozoic. Studying their decline has been controversial mainly due to the scarcity of the fossil record, and different methodological approaches have led to contradictory hypotheses. In an effort to explore questions about their extinction, we developed a novel multi‐model statistical approach to analyse all of the currently available data at a continental scale. Using multiple regression analysis and new advances in beta diversity analysis, we used all currently available fossil data at a continental scale to test four competing hypotheses to account for the decline of sparassodontans: competition with placental carnivorans, competition with avian phorusrhacids, non‐competitive ecological interactions, and environmental fluctuations. Our results show that the sparassodontan extinction was a gradual process with species disappearing throughout the Cenozoic. Multiple regression analysis supported non‐competitive ecological interactions as the best extinction model. Native South American ungulates, African migrants (caviomorph rodents and platyrrhine primates) and didelphimorphians were the groups with the highest statistical significance. Sparassodontan beta diversity increased between South American Land Mammal Ages after the Paleocene–Eocene boundary. Our results demonstrate that ecological modelling techniques illuminate aspects of extinction processes whilst mitigating the limitations of the fossil record. Our study suggests that non‐competitive ecological interactions could have been the main driver for sparassodontan extinction rather than, as commonly assumed, a result of competition and/or abiotic fluctuations.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 98%

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confidence: 99%

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Extinction of South American sparassodontans (Metatheria): environmental fluctuations or complex ecological processes?

et al. 2016

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“…En los últimos años, el equipo del LACEV ha realizado de Paso Córdoba, a 15 km al sur de la ciudad de General Roca (Agnolín y Chafrat, 2015). Completa el elenco de reptiles de la Formación Chichinales el lagarto teido Callopistes rionegrensis (Quadros et al, 2018) (Fig.…”

Section: Museo Patagónico De Ciencias Naturales "Juan Carlos Salgado"...unclassified

Río Negro Y Sus Instituciones en El Desarrollo De Los Estudios Paleoherpetológicos

Salgado¹

2022

PEAPA

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Resumen.Los museos e instituciones científicas de Río Negro jugaron un rol importante en el desarrollo de estudios paleoherpetológicos.Dichos estudios fueron mayormente conducidos por profesionales de instituciones de otras partes del país. No obstante, la mayoría de las instituciones rionegrinas constituyen un soporte importante, tanto como repositorios de los materiales recolectados como en su accionar como apoyo logístico en la organización de tareas de campo y asistencia a las investigaciones. Varias de las instituciones de Río Negro cuentan con su propio personal de investigación. Gran parte de los estudios realizados se centran mayormente en herpetofauna de edad cretácica, aunque también involucran algunos materiales del Cenozoico.

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“…The Charadriiformes (shorebirds and allies) are a diverse highlevel taxon of birds, which, at present, occupy many different habitats, from the open sea and coastal shores to semideserts (Mayr 2009). The fossil record of the Charadriiformes in South America is scarce and limited to the Neogene of Argentina and Peru (Campbell 1979;Tambussi et al 1993;Cenizo and Agnolin 2007;Agnolin and Chafrat 2015) and the oldest South American Charadriiformes record corresponds to an indeterminate genus and species from the early Miocene of the Chichinales Formation, in the Patagonian locality of Paso Córdoba, Río Negro province, Argentina (Agnolin and Chafrat 2015). Molecular data have provided a robust framework for the interrelationships of the various groups of Charadriiformes, which fall into three clades: the Lari, the Charadrii, and the Scolopaci (Paton and Baker 2006;Baker et al 2007;Fain and Houde 2007;Mayr 2011).…”

Section: Introductionmentioning

confidence: 99%

A seedsnipe (Aves, Charadriiformes, Thinocoridae) from the Ensenadan Age/Stage (early-middle Pleistocene) of Buenos Aires, Argentina

2017

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The fossil record of the Charadriiformes in South America is scarce and limited to the Neogene of Argentina and Peru. In the present contribution, we present and describe a nearly complete tarsometatarsus of Thinocorus rumicivorus (Least Seedsnipe) from the Ensenadan Age/Stage (early-middle Pleistocene) of Punta Hermengo, Buenos Aires province, Argentina, which constitutes the youngest record for the species to date. We also compare the material with extant and fossil Thinocoridae. The stratigraphic range of the fossil predates the Matuyama/Brunhes boundary and is coincident with the biozone of Mesotherium cristatum, which indicates a more humid and warmer climate than the present for the species.

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New fossil bird remains from the Chichinales Formation (Early Miocene) of northern Patagonia, Argentina

Cited by 15 publications

References 17 publications

Extinction of South American sparassodontans (Metatheria): environmental fluctuations or complex ecological processes?

Extinction of South American sparassodontans (Metatheria): environmental fluctuations or complex ecological processes?

Río Negro Y Sus Instituciones en El Desarrollo De Los Estudios Paleoherpetológicos

A seedsnipe (Aves, Charadriiformes, Thinocoridae) from the Ensenadan Age/Stage (early-middle Pleistocene) of Buenos Aires, Argentina

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