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

Content Provider	Springer Nature Link
Author	Syme, Anna E.
Copyright Year	2011
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 underwent a species radiation, but the rate of diversification was not rapid compared to the current rate or to those of other taxa. Following an 8 million year period of fast molecular evolution but no taxonomic radiation, diversification rates have been constant for the past 15 million years. Comparable measures such as the gamma statistic can be used across taxa to make general conclusions about evolutionary rate constancy.
Starting Page	221
Ending Page	227
Page Count	7
File Format	PDF
ISSN	03782697
Journal	Plant Systematics and Evolution
Volume Number	298
Issue Number	1
e-ISSN	16156110
Language	English
Publisher	Springer Vienna
Publisher Date	2011-09-20
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Poaceae Stipeae Phylogeny Radiation Molecular evolution Plant Systematics/Taxonomy/Biogeography Plant Ecology Plant Sciences Plant Anatomy/Development
Content Type	Text
Resource Type	Article
Subject	Plant Science Ecology, Evolution, Behavior and Systematics

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