A New Time Tree Reveals Earth History's Imprint on the Evolution of Modern Birds

Overview

Journal Sci Adv

Specialties Biology
Science

Date 2016 Jan 30

PMID 26824065

Citations 114

Authors

Santiago Claramunt

Joel Cracraft

Affiliations

Soon will be listed here.

Abstract

Determining the timing of diversification of modern birds has been difficult. We combined DNA sequences of clock-like genes for most avian families with 130 fossil birds to generate a new time tree for Neornithes and investigated their biogeographic and diversification dynamics. We found that the most recent common ancestor of modern birds inhabited South America around 95 million years ago, but it was not until the Cretaceous-Paleogene transition (66 million years ago) that Neornithes began to diversify rapidly around the world. Birds used two main dispersion routes: reaching the Old World through North America, and reaching Australia and Zealandia through Antarctica. Net diversification rates increased during periods of global cooling, suggesting that fragmentation of tropical biomes stimulated speciation. Thus, we found pervasive evidence that avian evolution has been influenced by plate tectonics and environmental change, two basic features of Earth's dynamics.

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