Biotic community and landscape changes around the Eocene–Oligocene transition at Shapaja, Peruvian Amazonia: Regional or global drivers?

Antoine, Pierre; Yans, Johan; Castillo, Angélica Aliaga; Stutz, Narla Shannay; Abello, M. Alejandra; Adnet, Sylvain; Custódio, Michele Andriolli; Benites‐Palomino, Aldo; Billet, Guillaume; Boivin, Myriam; Herrera, Fabiany; Jaramillo, Carlos; Martínez, Camila; Moreno, Federico; Navarrete, Rosa E.; Parra, Francisco Javier; Pujos, François; Rage, J. C.; Ribeiro, Ana María; Robinet, Céline; Roddaz, Martín; Tejada-Lara, Julia V.; Varas-Malca, Rafael M.; Santos, Roberto Ventura; Salas-Gismondi, Rodolfo; Marivaux, Laurent

doi:10.1016/j.gloplacha.2021.103512

Cited by 28 publications

(36 citation statements)

References 103 publications

(139 reference statements)

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“…The latter is intercalated between thick violin-grey variegated paleosols pointing to the existence of a meandering river with sustainable floodplain [ 36 ]. These levels were originally mapped as belonging to the lower member of Ipururo Formation (middle Miocene in age in the Huallaga basin) [ 39 – 42 ], an assignation in agreement with the nature of their facies and depositional environment sequence.…”

Section: Methodsmentioning

confidence: 99%

Late middle Miocene caviomorph rodents from Tarapoto, Peruvian Amazonia

et al. 2021

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Miocene deposits of South America have yielded several species-rich assemblages of caviomorph rodents. They are mostly situated at high and mid- latitudes of the continent, except for the exceptional Honda Group of La Venta, Colombia, the faunal composition of which allowed to describe the late middle Miocene Laventan South American Land Mammal Age (SALMA). In this paper, we describe a new caviomorph assemblage from TAR-31 locality, recently discovered near Tarapoto in Peruvian Amazonia (San Martín Department). Based on mammalian biostratigraphy, this single-phased locality is unambiguously considered to fall within the Laventan SALMA. TAR-31 yielded rodent species found in La Venta, such as the octodontoid Ricardomys longidens Walton, 1990 (nom. nud.), the chinchilloids Microscleromys paradoxalis Walton, 1990 (nom. nud.) and M. cribriphilus Walton, 1990 (nom. nud.), or closely-related taxa. Given these strong taxonomic affinities, we further seize the opportunity to review the rodent dental material from La Venta described in the Ph.D. volume of Walton in 1990 but referred to as nomina nuda. Here we validate the recognition of these former taxa and provide their formal description. TAR-31 documents nine distinct rodent species documenting the four extant superfamilies of Caviomorpha, including a new erethizontoid: Nuyuyomys chinqaska gen. et sp. nov. These fossils document the most diverse caviomorph fauna for the middle Miocene interval of Peruvian Amazonia to date. This rodent discovery from Peru extends the geographical ranges of Ricardomys longidens, Microscleromys paradoxalis, and M. cribriphilus, 1,100 km to the south. Only one postcranial element of rodent was unearthed in TAR-31 (astragalus). This tiny tarsal bone most likely documents one of the two species of Microscleromys and its morphology indicates terrestrial generalist adaptations for this minute chinchilloid.

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Section: Methodsmentioning

confidence: 99%

Late middle Miocene caviomorph rodents from Tarapoto, Peruvian Amazonia

et al. 2021

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“…and dermal scutes of the pampatheriid xenarthran Scirrotherium sp., pointing to an early middle-late Miocene age (Jiménez-Lara, 2020), in good agreement with the hypothesized age for TAR-31. Antoine et al, 2021). B, Hypothesized age of TAR-31 (dark grey horizontal area), based on biostratigraphical ranges of mammalian taxa of interest (see Marivaux et al, 2020, Boivin et al, 2021, andreferences therein).…”

Section: Paleontological Background and Geological Settingmentioning

confidence: 99%

“…Western Amazonia has been regarded as an epicenter of biodiversity across the entire Cenozoic era (e.g., Hoorn et al, 2010;Antoine et al, 2016Antoine et al, , 2021Carvalho et al, 2021). In particular, this area hosted a great mammalian diversity during the middle to late Miocene interval (with up to 14 orders and 40 families documented; Antoine et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Late middle Miocene Metatheria (Mammalia: Didelphimorphia and Paucituberculata) from Juan Guerra, San Martín Department, Peruvian Amazonia

Stutz

Abello

Marivaux

et al. 2022

Journal of South American Earth Sciences

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“…Unchanged winter temperatures and the shift of marine to terrestrial environments might complicate the recording of this temperature seasonality strengthening. Recording lowlatitude changes in seasonality strengthening may however be possible as shown by a recent study combining multiple lines of evidences (including plant and primate macrofossils), which suggest a potential shift from tropical to more open deciduous vegetation through the EOT, reflecting increased seasonality in precipitation and/or temperature seasonality during the early Oligocene at low latitudes of South America (Peru, ∼ 7 • S, Antoine et al, 2021). More studies would probably enable a better understanding of the evolution of the seasonality in this low-latitude area.…”

Section: Perspectives On Environmental and Biotic Crisismentioning

confidence: 99%

Evolution of continental temperature seasonality from the Eocene greenhouse to the Oligocene icehouse –a model–data comparison

et al. 2022

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Abstract. At the junction of greenhouse and icehouse climate states, the Eocene–Oligocene Transition (EOT) is a key moment in Cenozoic climate history. While it is associated with severe extinctions and biodiversity turnovers on land, the role of terrestrial climate evolution remains poorly resolved, especially the associated changes in seasonality. Some paleobotanical and geochemical continental records in parts of the Northern Hemisphere suggest the EOT is associated with a marked cooling in winter, leading to the development of more pronounced seasons (i.e., an increase in the mean annual range of temperature, MATR). However, the MATR increase has been barely studied by climate models and large uncertainties remain on its origin, geographical extent and impact. In order to better understand and describe temperature seasonality changes between the middle Eocene and the early Oligocene, we use the Earth system model IPSL-CM5A2 and a set of simulations reconstructing the EOT through three major climate forcings: pCO2 decrease (1120, 840 and 560 ppm), the Antarctic ice-sheet (AIS) formation and the associated sea-level decrease. Our simulations suggest that pCO2 lowering alone is not sufficient to explain the seasonality evolution described by the data through the EOT but rather that the combined effects of pCO2, AIS formation and increased continentality provide the best data–model agreement. pCO2 decrease induces a zonal pattern with alternating increasing and decreasing seasonality bands particularly strong in the northern high latitudes (up to 8 ∘C MATR increase) due to sea-ice and surface albedo feedback. Conversely, the onset of the AIS is responsible for a more constant surface albedo yearly, which leads to a strong decrease in seasonality in the southern midlatitudes to high latitudes (>40∘ S). Finally, continental areas that emerged due to the sea-level lowering cause the largest increase in seasonality and explain most of the global heterogeneity in MATR changes (ΔMATR) patterns. The ΔMATR patterns we reconstruct are generally consistent with the variability of the EOT biotic crisis intensity across the Northern Hemisphere and provide insights on their underlying mechanisms.

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Biotic community and landscape changes around the Eocene–Oligocene transition at Shapaja, Peruvian Amazonia: Regional or global drivers?

Cited by 28 publications

References 103 publications

Late middle Miocene caviomorph rodents from Tarapoto, Peruvian Amazonia

Late middle Miocene caviomorph rodents from Tarapoto, Peruvian Amazonia

Late middle Miocene Metatheria (Mammalia: Didelphimorphia and Paucituberculata) from Juan Guerra, San Martín Department, Peruvian Amazonia

Evolution of continental temperature seasonality from the Eocene greenhouse to the Oligocene icehouse –a model–data comparison

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