The moulding of intra-specific trait variation by selection under ecological inheritance

Abstract

Organisms continuously modify their environment, often impacting the fitness of future conspecifics due to ecological inheritance. When this inheritance is biased towards kin, selection favours modifications that increase the fitness of downstream individuals. How such selection shapes trait diversity within populations, however, remains poorly understood. Using mathematical modelling, we investigate the coevolution of multiple traits in a group-structured population when these traits affect the group environment, which is then bequeathed to future generations. We examine when such coevolution favours polymorphism as well as the resulting associations among traits. We find in particular that two traits become associated when one trait affects the environment while the other influences the likelihood that future kin experience this environment. To illustrate this, we model the coevolution of (a) the attack rate on a local renewable resource, which deteriorates environmental conditions, with (b) dispersal between groups, which reduces the likelihood that kin suffers from such deterioration. We show this often leads to the emergence of two highly-differentiated morphs: one that readily disperses and depletes local resources; and another that maintains these resources and tends to remain philopatric. More broadly, we suggest that ecological inheritance can contribute to phenotypic diversity and lead to complex polymorphism.

Evolutionary game theory and the adaptive dynamics approach: adaptation where individuals interact

“…when individuals deplete local resources and this disproportionately influences relatives in the future through ecological inheritance [145][146][147]), whose implications are best understood under the light of kin selection (e.g. [145,[148][149][150][151][152][153][154]). With regard to physiological and age-structure, we have not addressed the complications that arise when individuals can be born in different initial internal states (e.g.…”

Evolutionary Game Theory and the Adaptive Dynamics Approach: Adaptation where Individuals Interact

“…when individuals deplete local resources and this disproportionately influences relatives in the future through ecological inheritance [137][138][139]), whose implications are best understood under the light of kin selection (e.g. [137,[140][141][142][143][144][145][146]). With regard to physiological and age-structure, we have not addressed the complications that arise when individuals can be born in different initial internal states (e.g.…”