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bioRxiv · 10.1101/267575

Habitat choice stabilizes metapopulation dynamics through increased ecological specialisation.

Mortier, F.·Jacob, S.·Vandegehuchte, M. L.·Bonte, D.
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Abstract

Dispersal is a key trait responsible for the spread of individuals and genes among local populations, thereby generating eco-evolutionary interactions. Especially in heterogeneous metapopulations, a tight coupling between dispersal, population dynamics and the evolution of local adaptation is expected. In this respect, current theory predicts dispersal to counteract ecological specialisation by redistributing locally selected phenotypes (i.e. migration load). However, in nature we observe that some specialists exhibit a strong dispersal capacity.\n\nHabitat choice following informed dispersal decisions, provides a possible mechanism for individuals to match the environment to their phenotype, thereby enabling the persistence of evolved ecological specialisation. How such informed decisions affect the evolution of dispersal and ecological specialisation and how these, in turn, influence metapopulation dynamics is yet to be determined.\n\nBy means of individual-based modelling, we show that informed decisions on both departure and settlement decouples the evolution of dispersal and generalism, favouring highly dispersive specialists. Choice at settlement decouples dispersal from ecological specialisation most effectively. Additionally, habitat choice stabilizes local and metapopulation demography because of the maintenance of ecological specialisation at all levels of dispersal propensity.\n\nWe advocate considering habitat choice in spatially structured ecological models to improve demographic predictions in the face of environmental change.

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Mortier, F., Jacob, S., Vandegehuchte, M. L., Bonte, D.. 2018-02-19. Habitat choice stabilizes metapopulation dynamics through increased ecological specialisation.. https://doi.org/10.1101/267575

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