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The evolution of bequeathal in stable habitats.

ABSTRACT: Adults sometimes disperse, while philopatric offspring inherit the natal site, a pattern known as bequeathal. Despite a decades-old empirical literature, little theoretical work has explored when natural selection may favor bequeathal. We present a simple mathematical model of the evolution of bequeathal in a stable environment, under both global and local dispersal. We find that natural selection favors bequeathal when adults are competitively advantaged over juveniles, baseline mortality is high, the environment is unsaturated, and when juveniles experience high dispersal mortality. However, frequently bequeathal may not evolve, because the fitness cost for the adult is too large relative to inclusive fitness benefits. Additionally, there are many situations for which bequeathal is an ESS, yet cannot invade the population. As bequeathal in real populations appears to be facultative, yet-to-be-modeled factors like timing of birth in the breeding season may strongly influence the patterns seen in natural populations.

SUBMITTER: Clarke PMR

PROVIDER: S-EPMC6238137 | biostudies-literature | 2018 Nov

REPOSITORIES: biostudies-literature

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The evolution of bequeathal in stable habitats.

Clarke Parry M R PMR McElreath Mary Brooke MB Barrett Brendan J BJ Mabry Karen E KE McElreath Richard R

Ecology and evolution 20181016 21

Adults sometimes disperse, while philopatric offspring inherit the natal site, a pattern known as <i>bequeathal</i>. Despite a decades-old empirical literature, little theoretical work has explored when natural selection may favor bequeathal. We present a simple mathematical model of the evolution of bequeathal in a stable environment, under both global and local dispersal. We find that natural selection favors bequeathal when adults are competitively advantaged over juveniles, baseline mortalit ...[more]

PMID: 30464831

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