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Syndrome-driven diversification in a Mediterranean ecosystem.

Miguel Verdú1, Juli G Pausas

  • 1CIDE-CSIC, Campus IVIA, Carretera Montcada-Náquera, Montcada, Valencia, Spain. miguel.verdu@uv.es

Evolution; International Journal of Organic Evolution
|June 5, 2013
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Summary
This summary is machine-generated.

Local diversification in Mediterranean shrublands was driven by environmental filters. Nonsclerophyllous lineages showed higher speciation rates, leading to distinct evolutionary trajectories under new climate conditions.

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Phylogenetics

Background:

  • Traditional phylogenetic methods focus on broad taxonomic clades, limiting local diversification studies.
  • Novel environmental conditions, like the Mediterranean climate, can act as filters, impacting lineage diversification rates.
  • Morpho-functional syndromes may influence how lineages respond to environmental filters.

Purpose of the Study:

  • To investigate syndrome-driven local diversification in Mediterranean shrublands.
  • To test if different morpho-functional syndromes (sclerophyllous vs. nonsclerophyllous) exhibit varying diversification rates under Mediterranean conditions.
  • To apply macroevolutionary methods to a dated local phylogeny incorporating environmental filters.

Main Methods:

  • Utilized time-dependent diversification analyses on a calibrated local phylogeny.
  • Accounted for topological and chronological uncertainty in phylogenetic reconstruction.
  • Examined diversification rates in relation to sclerophyllous and nonsclerophyllous syndromes in Eastern Iberian Peninsula shrublands.

Main Results:

  • Phylogenetic evidence indicated higher speciation rates in nonsclerophyllous lineages.
  • Extinction rates were comparable between sclerophyllous and nonsclerophyllous syndromes.
  • Demonstrated syndrome-driven local diversification under Mediterranean environmental conditions.

Conclusions:

  • The rise of Mediterranean conditions acted as an environmental filter, promoting syndrome-driven diversification.
  • Integrating environmental filters into dated phylogenies can reconstruct local lineage histories.
  • Helps explain ecosystem assembly processes in Mediterranean environments.