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Fitness measures in selection analyses: sensitivity to the overall number of offspring produced in a lifetime

journal contribution
posted on 2023-06-09, 14:38 authored by H L Dugdale, Pierre NouvelletPierre Nouvellet, L C Pope, T Burke, D W Macdonald
Age at first (a) and last (?) breeding are important life-history traits; however, the direction and strength of selection detected on traits may vary depending on the fitness measure used. We provide the first estimates of lifetime breeding success (LBS) and ?ind (the population growth rate of an individual) of European badgers Meles meles, by genotyping 915 individuals, sampled over 18 years, for 22 microsatellites. Males are slightly larger than females, and the opportunity for selection was slightly greater for males, as predicted. ?ind and LBS both performed well in predicting the number of grand-offspring, and both detected selection for a late ?, until the age of eight. Differential selection (S'a) for an early a, however, was only detected using LBS, not with ?ind. In declining populations (?ind < 1) selection favours reproduction later in life, whereas early reproduction is selected in increasing populations (?ind > 1). As 41% of badgers were assigned only one offspring (?ind < 1), whereas 40% were assigned more than two (?ind > 1), this cancelled out S'a measured by ?ind.

History

Publication status

  • Published

File Version

  • Published version

Journal

Journal of Evolutionary Biology

ISSN

1010061X

Publisher

Wiley

Issue

2

Volume

23

Page range

282-292

Department affiliated with

  • Evolution, Behaviour and Environment Publications

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2018-08-21

First Compliant Deposit (FCD) Date

2018-08-21

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