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Evolution of the Miocene faunal diversity across Eurasia: to the roots of modern climates

English title Evolution of the Miocene faunal diversity across Eurasia: to the roots of modern climates
Applicant Maridet Olivier
Number 190584
Funding scheme Spark
Research institution Jurassica Museum Service sc. auxiliaire en géosciences
Institution of higher education Non-profit organisations (libraries, museums, foundations) and administration - NPO
Main discipline Palaeontology
Start/End 01.04.2020 - 31.03.2024
Approved amount 75'060.00
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Keywords (9)

Paleoecology; Prospection; Fossil; Paleoclimate; Small mammals; Eurasia; Transfer function; Paleogeography; Vertebrate paleontology

Lay Summary (French)

Lead
A une même latitude, entre 35° et 45° Nord, le climat est supposé être similaire en Eurasie, généralement tempéré variant entre des environnements allant de semi-humide à semi-aride. Cependant, les climats actuels d’Eurasie dans ces latitudes sont nettement plus variés en raison de la présence de chaines de montagnes et de mers fermées. Toutefois, cette configuration géographique est récente et à beaucoup changé durant les 20 derniers millions d’années. En conséquence, l’origine des climats actuels d’Eurasie et leur différentiation, et en particulier le début de la désertification en Asie centrale, restent mal connus.
Lay summary

Contenu et objectifs du travail de recherche:
L’idée de ce projet est de suivre la différentiation des climats d’Eurasie sur un transect Est-Ouest, depuis le Japon jusqu’à l’Europe, au cours du Miocène (-23 à -3 Ma) en comparant plusieurs régions localisées entre 35° et 45° de latitude nord. A cette fin, les petits mammifères, particulièrement sensibles aux variations climatiques, seront étudiés dans chaque registre fossile local afin de comparer les évolutions climatiques régionales. En plus des méthodes de reconstructions climatiques et environnementales existantes, de nouvelles méthodes seront développées afin de quantifier les changements climatiques à partir des variations du registre fossile. Ces études s’accompagneront de missions de prospections et d’échantillonnage au Kazakhstan et au Japon afin de compléter ces registres fossiles encore mal connus.

Contexte scientifique et social du projet de recherche:
Le but de ce projet est de mieux comprendre les liens qui existent sur le long terme entre biodiversité et changements climatiques. En effet, dû aux changements climatiques récents, la préservation de la biodiversité est devenue un enjeu majeur de la recherche scientifique. Toutefois les processus impliqués prennent du temps, et seul le registre fossile permet de travailler à une échelle de temps suffisante pour évaluer les facteurs qui impactent durablement la biodiversité. L’évolution des environnements terrestres régionaux d’Eurasie constitue un laboratoire naturel parfait pour mieux comprendre ces processus à des échelles de temps évolutives.

Direct link to Lay Summary Last update: 25.11.2019

Responsible applicant and co-applicants

Publications

Publication
A new glirid-like cricetid from the lower Oligocene of southern China
Lu Xiao-Yu, Ni Xijun, Maridet Olivier (2021), A new glirid-like cricetid from the lower Oligocene of southern China, in Journal of Vertebrate Paleontology, e1917587-e1917587.
The record of Deinotheriidae from the Miocene of the Swiss Jura Mountains (Jura Canton, Switzerland)
Gagliardi Fanny, Maridet Olivier, Becker Damien (2021), The record of Deinotheriidae from the Miocene of the Swiss Jura Mountains (Jura Canton, Switzerland), in PCI-Paleo, 244061.
Reconstruction scientifique et artistique d’un paysage du Miocène supérieur d’Europe : cas de la localité de l’Aumane (Cucuron, Vaucluse, France)
RöschliPatrick, BeckerDamien, CosterPauline, LegalStéphane, MaridetOlivier, Reconstruction scientifique et artistique d’un paysage du Miocène supérieur d’Europe : cas de la localité de l’Aumane (Cucuron, Vaucluse, France), 2021.

Datasets

Supplementary data for: Gagliardi et al. (2021) The record of Deinotheriidae from the Miocene of the Swiss Jura Mountains (Jura Canton, Switzerland)

Author Gagliardi, Fanny; Maridet, Olivier; Becker, Damien
Publication date 07.04.2021
Persistent Identifier (PID) 10.5281/zenodo.4468801
Repository Zotero
Abstract
Dataset of the fossil record of European Deinotheriidae (including bibliographic references) used in the publication for the paleobiogeographic analysis.

Communication with the public

Communication Title Media Place Year
Media relations: radio, television 20 Millionen Jahre alte Funde im Berner Tiefenbahnhof SRF 1 German-speaking Switzerland 2021

Abstract

In Eurasia, between 35° and 45° of latitude north, today’s climate is expected to be temperate, either semi-humid next to seas and oceans to semi-dry in more continental areas. However, the regional climates show much disparity across Eurasia with the occurrence of colder and dryer regional climates (e.g. Central Europe, Central Asia, North-eastern Asia; Fig. 1a,b). Indeed where mountain ranges are high enough, temperatures a significantly lower (not only on the ranges but also around) and the modification of air circulation induce a deficit of precipitations in some areas. The most striking phenomenon in the mid-latitudes is the desertification in Central and North-Eastern Asia with cooler climate, amplified by the distances to the nearest seas. However, this Eurasian geographic pattern is relatively recent and the past records need to be taken into account in order to understand the roots of today’s climate.The idea of the present project is to gather an international team of experts (palaeontologist and geologist) from Europe and Asia in order to conduct a continental-scale comparisons of the regional records of fossil vertebrates during the Miocene time period, which is a fundamental root of modern climate with modern mammalian faunas at the family level. All together, the fossil records of 5 regions (with different climatic conditions nowadays) are included in the project: Western Europe, Eastern Europe, Southwestern Kazakhstan, Northern China, and Japan.Our research project includes two distinct parts. In the first part, we focus on already identified and published extant and fossil specimens housed in proper institutions in order to establish a new transfer function (regression model) to estimate palaeoclimatic parameters based on fossil rodent assembles. This new transfer function will function as an independent tool, in addition to existing models, to reconstruct and compare past climates across Eurasia. In the second part, we focus on field investigation in Kazakhstan and Japan to enhance the accuracy of our models by increasing paleontological samples from the areas where only few research have been conducted. For this reason, the project includes a large part of prospection and an exceptional duration of 2 years is requested.On top of the palaeontologic discoveries about extinct species, the results of this project are expected to provide new information about the settlement of a true desert ecosystem in Central Asia, and provide further indications on differential roles of the global climate, geography and local tectonic constrains as major drivers of desertification. In addition, as active tectonic events, the potential impact of the Parathetys extension and isolation from the continent of the Japanese islands will also be taken into account to test its impact on regional climatic evolutions and in turn the evolutionary history of mammals.
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