3 years ago

Phylogenetic conservatism of species range size is the combined outcome of phylogeny and environmental stability

Arnaud Brayard, Jean-Louis Dommergues, Axelle Zacaï, Rémi Laffont, Emmanuel Fara, Christian Meister
Aim To test for the phylogenetic conservatism of geographic range size and to explore the effect of the environment on this potential conservatism. Location The western Tethys Ocean and its surroundings (present-day Europe, the Middle East and North Africa) during the early Pliensbachian (Early Jurassic). Methods Using 104 localities and 1,765 occurrences of ammonite species, we estimated geographic range sizes using the extent of occurrence and the latitudinal range. The phylogenetic conservatism of range sizes was tested using Moran's I index which measures phylogenetic autocorrelation, and Pagel's λ which indicates whether a phylogeny correctly predicts covariance patterns among taxa on a given trait according to a Brownian evolution model. We conducted these analyses for two neighbouring provinces with contrasting environmental features (Mediterranean and Northwest European). We also explored scale effects by considering the whole western Tethys and two temporal resolutions (chronozone and sub-stage). Results A marked difference in phylogenetic signal is observed between Mediterranean (MED) and Northwest European (NWE) species; the range size of MED species is more frequently phylogenetically conserved than that of NWE species. No phylogenetic conservatism of species range size is observed during the last chronozone of the early Pliensbachian which is characterized by numerous palaeoclimatic and palaeoenvironmental changes. Main conclusions Species range size may be partly determined by phylogeny, but this phylogenetic conservatism is modulated by spatio-temporal environmental stability. The phylogenetic signal of species range size may be labile through time within the same lineage and may differ between contemporaneous species of the same group. This lability stems from the fact that species range size results from a complex interplay of intrinsic and extrinsic factors.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1111/jbi.13043

You might also like
Never Miss Important Research

Researcher is an app designed by academics, for academics. Create a personalised feed in two minutes.
Choose from over 15,000 academics journals covering ten research areas then let Researcher deliver you papers tailored to your interests each day.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.