A1 Journal article – refereed

On fitness in metapopulations that are both size- and stage-structured

List of Authors: Kalle Parvinen, Anne Seppänen

Publisher: SPRINGER HEIDELBERG

Publication year: 2016

Journal: Journal of Mathematical Biology

Journal name in source: JOURNAL OF MATHEMATICAL BIOLOGY

Journal acronym: J MATH BIOL

Volume number: 73

Issue number: 4

ISSN: 0303-6812

Abstract

A proxy for the invasion fitness in structured metapopulation models has been defined as a metapopulation reproduction ratio, which is the expected number of surviving dispersers produced by a mutant immigrant and a colony of its descendants. When a size-structured metapopulation model involves also individual stages (such as juveniles and adults), there exists a generalized definition for the invasion fitness proxy. The idea is to calculate the expected numbers of dispersers of all different possible types produced by a mutant clan initiated with a single mutant, and to collect these values into a matrix. The metapopulation reproduction ratio is then the dominant eigenvalue of this matrix. The calculation method has been published in detail in the case of small local populations. However, in case of large patches the previously published numerical calculation method to obtain the expected number of dispersers does not generalize as such, which gives us one aim of this article. Here, we thus derive a generalized method to calculate the invasion fitness in a metapopulation, which consists of large local populations, and is both size- and stage-structured. We also prove that the metapopulation reproduction ratio is well-defined, i.e., it is equal to 1 for a mutant with a strategy equal to the strategy of a resident. Such a proof has not been previously published even for the case with only one type of individuals.