Publications des scientifiques de l'IRD

Triantis K. A., Economo E. P., Guilhaumon François, Ricklefs R. E. (2015). Diversity regulation at macro-scales : species richness on oceanic archipelagos. Global Ecology and Biogeography, 24 (5), p. 594-605. ISSN 1466-822X.

Titre du document
Diversity regulation at macro-scales : species richness on oceanic archipelagos
Année de publication
2015
Type de document
Article référencé dans le Web of Science WOS:000352530900009
Auteurs
Triantis K. A., Economo E. P., Guilhaumon François, Ricklefs R. E.
Source
Global Ecology and Biogeography, 2015, 24 (5), p. 594-605 ISSN 1466-822X
AimUnderstanding the mechanisms that generate diversity patterns requires analyses at spatial and temporal scales that are appropriate to the dispersal capacities and ecological requirements of organisms. Oceanic archipelagos provide a range of island sizes and configurations which should predictably influence colonization, diversification and extinction. To explore the influence of these factors on archipelagic diversity, we relate the numbers of native and endemic species of vascular plants, birds, land snails and spiders - taxa having different dispersal capabilities and population densities - to the number and sizes of islands in the major oceanic archipelagos of the globe. LocationFourteen major oceanic archipelagos of the globe. MethodsSpecies richness was collated for native and endemic species in each archipelago. We used linear mixed effect models to quantify the influence on diversity of total area, number of islands, isolation and latitude. We then applied process-based modelling in a Bayesian framework to evaluate how speciation, colonization and extinction are influenced by characteristics of archipelagos associated with species richness, i.e. area, isolation and number of islands. ResultsWe found parallel scaling of species richness among taxa with respect to total area and number of islands across groups. The process-based model supported effects of isolation on colonization and of area and number of islands on extinction rates, with the scaling exponents mostly similar across taxa. Data are consistent with a range of scaling exponents for speciation rate, implying that those relationships are difficult to infer from the data used. ConclusionsWe demonstrate an unexpected parallel scaling of species richness of four taxa with area and number of islands for the major oceanic archipelagos of the globe. We infer that this scaling arises through similar effects of the physical characteristics of archipelagos on extinction, colonization and speciation rates across these disparate taxa, indicating that similar mechanisms have created variation in diversity.
Plan de classement
Sciences fondamentales / Techniques d'analyse et de recherche [020] ; Ecologie, systèmes aquatiques [036] ; Etudes, transformation, conservation du milieu naturel [082]
Description Géographique
ACORES ; CANARIAS ; COMORES ; GALAPAGOS ; GOLFE DE GUINEE ; HAWAII ; JUAN FERNANDEZ ; PACIFIQUE ILES ; MADEIRA ; ATLANTIQUES ILES ; MARQUISES ; SAMOA ; POLYNESIE ; MASCAREIGNES ; MARIANAS NORTHERN ; MICRONESIE ; SOCIETE ILES ; TRISTAN DA CUNHA
Localisation
Fonds IRD [F B010064117]
Identifiant IRD
fdi:010064117
Contact