A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

Evolution of dispersal in a spatially heterogeneous population with finite patch sizes




Julkaisun tekijät: Parvinen K, Ohtsuki H, Wakano JY

Kustantaja: NATL ACAD SCIENCES

Julkaisuvuosi: 2020

Journal: Proceedings of the National Academy of Sciences of the United States of America

Tietokannassa oleva lehden nimi: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA

Lehden akronyymi: P NATL ACAD SCI USA

Volyymi: 117

Julkaisunumero: 13

Sivujen määrä: 6

ISSN: 0027-8424

eISSN: 1091-6490

DOI: http://dx.doi.org/10.1073/pnas.1915881117


Tiivistelmä
Dispersal is one of the fundamental life-history strategies of organisms, so understanding the selective forces shaping the dispersal traits is important. In the Wright's island model, dispersal evolves due to kin competition even when dispersal is costly, and it has traditionally been assumed that the living conditions are the same everywhere. To study the effect of spatial heterogeneity, we extend the model so that patches may receive different amounts of immigrants, foster different numbers of individuals, and give different reproduction efficiency to individuals therein. We obtain an analytical expression for the fitness gradient, which shows that directional selection consists of three components: As in the homogeneous case, the direct cost of dispersal selects against dispersal and kin competition promotes dispersal. The additional component, spatial heterogeneity, more precisely the variance of so-called relative reproductive potential, tends to select against dispersal. We also obtain an expression for the second derivative of fitness, which can be used to determine whether there is disruptive selection: Unlike the homogeneous case, we found that divergence of traits through evolutionary branching is possible in the heterogeneous case. Our numerical explorations suggest that evolutionary branching is promoted more by differences in patch size than by reproduction efficiency. Our results show the importance of the existing spatial heterogeneity in the real world as a key determinant in dispersal evolution.

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Last updated on 2021-24-06 at 08:52