The neutral theory of biodiversity with random fission speciation

Rampal Etienne 1 Bart Haegeman 2
2 MODEMIC - Modelling and Optimisation of the Dynamics of Ecosystems with MICro-organisme
CRISAM - Inria Sophia Antipolis - Méditerranée , MISTEA - Mathématiques, Informatique et STatistique pour l'Environnement et l'Agronomie
Abstract : The neutral theory of biodiversity and biogeography emphasizes the importance of dispersal and speciation to macro-ecological diversity patterns. While the influence of dispersal has been studied quite extensively, the effect of speciation has not received much attention, even though it was already claimed at an early stage of neutral theory development that the mode of speciation would leave a signature on metacommunity structure. Here, we derive analytical expressions for the distribution of abundances according to the neutral model with recruitment (i.e., dispersal and establishment) limitation and random fission speciation which seems to be a more realistic description of (allopatric) speciation than the point mutation mode of speciation mostly used in neutral models. We find that the two modes of speciation behave qualitatively differently except when recruitment is strongly limited. Fitting the model to six large tropical tree data sets, we show that it performs worse than the original neutral model with point mutation speciation but yields more realistic predictions for speciation rates, species longevities, and rare species. Interestingly, we find that the metacommunity abundance distribution under random fission is identical to the broken-stick abundance distribution and thus provides a dynamical explanation for this grand old lady of abundance distributions.
Type de document :
Article dans une revue
Theoretical Ecology, Springer 2011, 4 (1), pp.87-109. 〈10.1007/s12080-010-0076-y〉
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Contributeur : Bart Haegeman <>
Soumis le : mercredi 7 décembre 2011 - 12:12:27
Dernière modification le : samedi 27 janvier 2018 - 01:32:20

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Rampal Etienne, Bart Haegeman. The neutral theory of biodiversity with random fission speciation. Theoretical Ecology, Springer 2011, 4 (1), pp.87-109. 〈10.1007/s12080-010-0076-y〉. 〈hal-00649196〉



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