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Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Proc+Natl+Acad+Sci+U+S+A 2016 ; 113 (51): 14757-62 Nephropedia Template TP
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Anomalously high variation in postnatal development is ancestral for dinosaurs but lost in birds #MMPMID27930315
Griffin CT; Nesbitt SJ
Proc Natl Acad Sci U S A 2016[Dec]; 113 (51): 14757-62 PMID27930315show ga
Birds?the fastest growing terrestrial vertebrates?develop unlike all other living reptiles. As part of this postnatal developmental mode, birds possess a low amount of intraspecific variation, and the timing of the origin of this low variation is poorly constrained. By studying well-sampled growth series of nonavian dinosaurs and their closest relatives, we were able to identify this transition within Mesozoic theropod dinosaurs. Surprisingly, the earliest dinosaurs and their close relatives possessed an extremely high amount of variation, higher than either crocodylians or birds. This high variation is the ancestral dinosaurian scheme and was lost in more derived nonavian theropods, including Allosaurus and Tyrannosaurus. High variation could have contributed to the rise of dinosaurian dominance during the Triassic?Jurassic mass extinction.