Cast of Mossospondylus eggs and embryo Photo from Royal Ontario Museum by Daderot (CC) |
Reconstruction of Protoceratops andrewsi AntoninJury (Wikimedia Commons) CC BY-SA 4.0 |
It is suggested that the relatively long generation times of non-avian dinosaurs put them at a disadvantage in competing with birds, reptiles and mammals during the Cretaceous-Palaeogene transition.
Very interesting. It relates to an issue that has long puzzled me, which is why bird eggs develop and hatch at a far faster rate than those of squamates. The difference cannot be attributed to temperature. Meanwhile, crocodilian eggs take 65-90 days, depending on the species... making them intermediate between those of birds and the dinosaurs featured in the PNAS article.
ReplyDeleteI wonder if it is more to do with population size, that is, species with long gestation lengths are larger and have smaller populations. The small population size puts them at risk of extinction, think elephants versus mice. Thanks for the interesting link!
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