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Effects of time and isolation on plant diversity: testing island biogeography theory with an eco-evolutionary model

Juliano Sarmento Cabral,R. Whittaker,K. Wiegand,H. Kreft

Published 2017 in bioRxiv

ABSTRACT

Aims The General Dynamic Model of oceanic island biogeography (GDM) predicts how biogeographical rates, species richness, and endemism vary depending on island age, area, and isolation, based on the interplay of colonization, extinction, and speciation. Here, we used a simulation model to test whether GDM predictions may arise from individual- and population-level processes. Location Hypothetical hotspot islands. Methods Our model (i) considers an idealized island ontogeny, (ii) metabolic constraints, and (iii) stochastic, spatially-explicit, and niche-based processes at the level of individuals and populations (plant demography, dispersal, competition, mutation, and speciation). Isolation scenarios involved varying dispersal ability and distances to mainland. Results Humped temporal trends were obtained for species richness, endemic richness, proportion of cladogenetic endemic species, number of radiating lineages, number of species per radiating lineage, and biogeographical rates. The proportion of anagenetic endemics and of all endemics steadily increased over time. Extinction rates of endemic species peaked later than for non-endemic species. Species richness and the number of anagenetic endemics decreased with isolation as did rates of colonization, anagenesis, and extinction. The proportion of all endemics and of cladogenetic endemics, the number of cladogenetic endemics, of radiating lineages, and of species per radiating lineage, and the cladogenesis rate all increased with isolation. Main conclusions The results confirm most GDM predictions related to island ontogeny and isolation, but predict an increasing proportion of endemics throughout the experiment: a difference attributable to diverging assumptions on late island ontogeny. New insights regarding the extinction trends of endemics further demonstrate how simulation models focusing on low ecological levels provide tools to test biogeographical-scale predictions and to develop more detailed predictions for further empirical tests.

PUBLICATION RECORD

  • Publication year

    2017

  • Venue

    bioRxiv

  • Publication date

    2017-01-13

  • Fields of study

    Biology, Environmental Science

  • Identifiers
    DOI 10.1101/100289
  • External record

    Open on Semantic Scholar

  • Source metadata

    Semantic Scholar

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