Journal article

Diversification rates in the Australasian endemic grass Austrostipa: 15 million years of constant evolution

Anna E Syme

PLANT SYSTEMATICS AND EVOLUTION | SPRINGER WIEN | Published : 2012

Abstract

Patterns seen in other Australian flora have led to hypotheses that early Miocene shifts in climate drove rapid radiation of major taxonomic groups such as Eucalyptus. Little is known about absolute dates and rates for Australian monocots, particularly grasses. I tested this early Miocene radiation hypothesis for Australian grasses using a calibrated phylogeny of the endemic stipoid genus Austrostipa and an analysis of diversification rates. The phylogeny was developed from a Bayesian likelihood analysis of the nuclear internal transcribed spacers region, and three calibration points were set based on fossil evidence. The results indicate that the genus arose in the early Miocene and underwe..

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