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2016 ; 7
(ä): 10825
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English Wikipedia
Extinction of fish-shaped marine reptiles associated with reduced evolutionary
rates and global environmental volatility
#MMPMID26953824
Fischer V
; Bardet N
; Benson RB
; Arkhangelsky MS
; Friedman M
Nat Commun
2016[Mar]; 7
(ä): 10825
PMID26953824
show ga
Despite their profound adaptations to the aquatic realm and their apparent
success throughout the Triassic and the Jurassic, ichthyosaurs became extinct
roughly 30 million years before the end-Cretaceous mass extinction. Current
hypotheses for this early demise involve relatively minor biotic events, but are
at odds with recent understanding of the ichthyosaur fossil record. Here, we show
that ichthyosaurs maintained high but diminishing richness and disparity
throughout the Early Cretaceous. The last ichthyosaurs are characterized by
reduced rates of origination and phenotypic evolution and their elevated
extinction rates correlate with increased environmental volatility. In addition,
we find that ichthyosaurs suffered from a profound Early Cenomanian extinction
that reduced their ecological diversity, likely contributing to their final
extinction at the end of the Cenomanian. Our results support a growing body of
evidence revealing that global environmental change resulted in a major,
temporally staggered turnover event that profoundly reorganized marine ecosystems
during the Cenomanian.