Topography-driven isolation, speciation and a global increase of endemism with elevation - Université de La Réunion
Article Dans Une Revue Global Ecology and Biogeography Année : 2016

Topography-driven isolation, speciation and a global increase of endemism with elevation

Manuel J. Steinbauer
  • Fonction : Auteur
Richard Field
John-Arvid Grytnes
  • Fonction : Auteur
Panayiotis Trigas
  • Fonction : Auteur
Fabio Attorre
H. John B. Birks
  • Fonction : Auteur
Paulo A. V. Borges
  • Fonction : Auteur
Pedro Cardoso
Chang-Hung Chou
  • Fonction : Auteur
Michele de Sanctis
Miguel M. De Sequeira
  • Fonction : Auteur
Maria C. Duarte
  • Fonction : Auteur
Rui B. Elias
  • Fonction : Auteur
Rosalina Gabriel
  • Fonction : Auteur
Roy E. Gereau
  • Fonction : Auteur
Rosemary G. Gillespie
  • Fonction : Auteur
Josef Greimler
  • Fonction : Auteur
David E. V. Harter
  • Fonction : Auteur
Severin D. H. Irl
  • Fonction : Auteur
Daniel Jeanmonod
  • Fonction : Auteur
Alistair S. Jump
  • Fonction : Auteur
Sandra Nogué
  • Fonction : Auteur
Jonathan Price
  • Fonction : Auteur
Maria M. Romeiras
  • Fonction : Auteur
Tod Stuessy
  • Fonction : Auteur
Jens-Christian Svenning
Ole R. Vetaas
  • Fonction : Auteur

Résumé

Aim Higher-elevation areas on islands and continental mountains tend to be separated by longer distances, predicting higher endemism at higher elevations; our study is the first to test the generality of the predicted pattern. We also compare it empirically with contrasting expectations from hypotheses invoking higher speciation with area, temperature and species richness. Location Thirty-two insular and 18 continental elevational gradients from around the world. Methods : We compiled entire floras with elevation-specific occurrence information, and calculated the proportion of native species that are endemic (‘percent endemism’) in 100-m bands, for each of the 50 elevational gradients. Using generalized linear models, we tested the relationships between percent endemism and elevation, isolation, temperature, area and species richness. Results :Percent endemism consistently increased monotonically with elevation, globally. This was independent of richness–elevation relationships, which had varying shapes but decreased with elevation at high elevations. The endemism–elevation relationships were consistent with isolation-related predictions, but inconsistent with hypotheses related to area, richness and temperature. Main conclusions : Higher per-species speciation rates caused by increasing isolation with elevation are the most plausible and parsimonious explanation for the globally consistent pattern of higher endemism at higher elevations that we identify. We suggest that topography-driven isolation increases speciation rates in mountainous areas, across all elevations and increasingly towards the equator. If so, it represents a mechanism that may contribute to generating latitudinal diversity gradients in a way that is consistent with both present-day and palaeontological evidence.

Dates et versions

hal-01456702 , version 1 (05-02-2017)

Identifiants

Citer

Manuel J. Steinbauer, Richard Field, John-Arvid Grytnes, Panayiotis Trigas, Claudine Ah-Peng, et al.. Topography-driven isolation, speciation and a global increase of endemism with elevation. Global Ecology and Biogeography, 2016, 25 (9), pp.1097--1107. ⟨10.1111/geb.12469⟩. ⟨hal-01456702⟩
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