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2017 ; 5
(ä): e3025
Nephropedia Template TP
gab.com Text
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English Wikipedia
Neogene amphibians and reptiles (Caudata, Anura, Gekkota, Lacertilia, and
Testudines) from the south of Western Siberia, Russia, and Northeastern
Kazakhstan
#MMPMID28348925
Vasilyan D
; Zazhigin VS
; Böhme M
PeerJ
2017[]; 5
(ä): e3025
PMID28348925
show ga
BACKGROUND: The present-day amphibian and reptile fauna of Western Siberia are
the least diverse of the Palaearctic Realm, as a consequence of the unfavourable
climatic conditions that predominate in this region. The origin and emergence of
these herpetofaunal groups are poorly understood. Aside from the better-explored
European Neogene localities yielding amphibian and reptile fossil remains, the
Neogene herpetofauna of Western Asia is understudied. The few available data need
critical reviews and new interpretations, taking into account the more recent
records of the European herpetofauna. The comparison of this previous data with
that of European fossil records would provide data on palaeobiogeographic
affiliations of the region as well as on the origin and emergence of the
present-day fauna of Western Siberia. An overview of the earliest occurrences of
certain amphibian lineages is still needed. In addition, studies that address
such knowledge gaps can be useful for molecular biologists in their calibration
of molecular clocks. METHODS AND RESULTS: In this study, we considered critically
reviewed available data from amphibian and reptile fauna from over 40 Western
Siberian, Russian and Northeastern Kazakhstan localities, ranging from the Middle
Miocene to Early Pleistocene. Herein, we provided new interpretations that arose
from our assessment of the previously published and new data. More than 50
amphibians and reptile taxa were identified belonging to families Hynobiidae,
Cryptobranchidae, Salamandridae, Palaeobatrachidae, Bombinatoridae, Pelobatidae,
Hylidae, Bufonidae, Ranidae, Gekkonidae, Lacertidae, and Emydidae.
Palaeobiogeographic analyses were performed for these groups and
palaeoprecipitation values were estimated for 12 localities, using the
bioclimatic analysis of herpetofaunal assemblages. CONCLUSION: The Neogene
assemblage of Western Siberia was found to be dominated by groups of European
affinities, such as Palaeobatrachidae, Bombina, Hyla, Bufo bufo, and a small part
of this assemblage included Eastern Palaearctic taxa (e.g. Salamandrella,
Tylototriton, Bufotes viridis). For several taxa (e.g. Mioproteus, Hyla, Bombina,
Rana temporaria), the Western Siberian occurrences represented their most eastern
Eurasian records. The most diverse collection of fossil remains was found in the
Middle Miocene. Less diversity has been registered towards the Early Pleistocene,
potentially due to the progressive cooling of the climate in the Northern
Hemisphere. The results of our study showed higher-amplitude changes of
precipitation development in Western Siberia from the Early Miocene to the
Pliocene, than previously assumed.