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Related Concept Videos

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A Concoction Pipeline for Generating Molecular Operational Taxonomic Units (MOTUs) Among Riparian and Aquatic Beetles
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The Phylogenetic Limits to Diversity-Dependent Diversification.

Rampal S Etienne1, Bart Haegeman2, Álvaro Dugo-Cota3

  • 1Groningen Institute for Evolutionary Life Sciences, University of Groningen, Box 11103, 9700 CC Groningen, The Netherlands.

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Area of Science:

  • Evolutionary Biology
  • Island Biogeography
  • Phylogenetics

Background:

  • Macroevolutionary competition's role is less understood than microevolutionary competition.
  • Phylogenetic evidence suggests lineage diversity can decelerate diversification rates.
  • It remains unclear if this diversity-dependence is limited to closely related species or extends to distantly related ones.

Purpose of the Study:

  • To investigate phylogenetic limits of diversity-dependence in macroevolution.
  • To differentiate between clade-specific (CS) and island-wide (IW) diversity-dependence models.
  • To apply these models to the diversification of Eleutherodactylus frogs on Hispaniola.

Main Methods:

  • Developed a new island-wide (IW) diversity-dependence model within the DAISIE (Dynamic Assembly of Island biota through Speciation Immigration and Extinction) framework.
  • Introduced a method to compute model likelihoods using phylogenetic data on colonization and branching events.
  • Employed likelihood ratio bootstrapping for robust comparison between CS and IW models.

Main Results:

  • The clade-specific (CS) diversity-dependence model provided a significantly better fit to the Eleutherodactylus frog diversification data than the island-wide (IW) model.
  • This indicates that distinct colonizations, despite similar ecotypes, do not strongly interact.
  • Non-overlapping distributions between clades do not necessarily imply CS diversity-dependence.

Conclusions:

  • Diversification on islands is primarily driven by clade-specific interactions, not island-wide ones.
  • Phylogenetic data, rather than distributional data, is crucial for inferring the limits of diversity-dependent diversification.
  • The developed modeling approach offers a powerful tool for future evolutionary and biogeographic studies.