A1 Journal article – refereed
The effect of fecundity derivatives on the condition of evolutionary branching in spatial models




List of Authors: Parvinen K, Ohtsuki H, Wakano JY
Publisher: ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
Publication year: 2017
Journal: Journal of Theoretical Biology
Journal name in source: JOURNAL OF THEORETICAL BIOLOGY
Journal acronym: J THEOR BIOL
Volume number: 416
ISSN: 0022-5193
eISSN: 1095-8541

Abstract
By investigating metapopulation fitness, we present analytical expressions for the selection gradient and conditions for convergence stability and evolutionary stability in Wright's island model in terms of fecundity function. Coefficients of each derivative of fecundity function appearing in these conditions have fixed signs. This illustrates which kind of interaction promotes or inhibits evolutionary branching in spatial models. We observe that Taylor's cancellation result holds for any fecundity function: Not only singular strategies but also their convergence stability is identical to that in the corresponding well-mixed model. We show that evolutionary branching never occurs when the dispersal rate is close to zero. Furthermore, for a wide class of fecundity functions (including those determined by any pairwise game), evolutionary branching is impossible for any dispersal rate if branching does not occur in the corresponding well-mixed model. Spatial structure thus often inhibits evolutionary branching, although we can construct a fecundity function for which evolutionary branching only occurs for intermediate dispersal rates.

Last updated on 2019-29-01 at 23:54