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Updated: Feb 25, 2026

Reproductive Techniques for Ovarian Monitoring and Control in Amphibians
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Did true frogs 'dispersify'?

Kin Onn Chan1, Rafe M Brown2

  • 1Biodiversity Institute and Department of Ecology and Evolutionary Biology, University of Kansas, Lawrence, KS, USA kin_onn@yahoo.com.

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|August 11, 2017
PubMed
Summary
This summary is machine-generated.

True frogs expanded globally, but this range expansion did not increase their diversification rate. Their evolutionary history shows a constant diversification rate despite widespread colonization.

Keywords:
Ranidae phylogenybiogeographydiversification shift

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Area of Science:

  • Evolutionary biology
  • Paleontology
  • Biogeography

Background:

  • True frogs (Anura) exhibit a history of global range expansion.
  • This lineage survived the Eocene-Oligocene extinction event (EOEE).
  • Understanding range expansion's effect on diversification is key in evolutionary biology.

Purpose of the Study:

  • To investigate diversification patterns in true frogs.
  • To assess the impact of the Eocene-Oligocene extinction event (EOEE).
  • To test if global range expansion correlates with increased net diversification.

Main Methods:

  • Construction of a densely sampled, time-calibrated phylogenetic tree.
  • Analysis of diversification tempos and patterns.
  • Evaluation of the EOEE's influence on diversification.

Main Results:

  • Late Eocene colonization of new regions was not impacted by the EOEE.
  • Global range expansion did not lead to increased net diversification in true frogs.
  • Diversification rates remained constant or declined post-expansion.

Conclusions:

  • The diversification history of true frogs contradicts expectations of accelerated diversification post-range expansion.
  • True frogs diversified at a relatively constant rate throughout their global colonization.
  • Amphibian diversification may not always accelerate with range expansion.