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2016 ; 12
(2
): 20150992
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Patterns of philopatry and longevity contribute to the evolution of
post-reproductive lifespan in mammals
#MMPMID26888915
Nichols HJ
; Zecherle L
; Arbuckle K
Biol Lett
2016[Feb]; 12
(2
): 20150992
PMID26888915
show ga
While menopause has long been known as a characteristic trait of human
reproduction, evidence for post-reproductive lifespan (PRLS) has recently been
found in other mammals. Adaptive and non-adaptive hypotheses have been proposed
to explain the evolution of PRLS, but formal tests of these are rare. We use a
phylogenetic approach to evaluate hypotheses for the evolution of PRLS among
mammals. In contrast to theoretical models predicting that PRLS may be promoted
by male philopatry (which increases relatedness between a female and her group in
old age), we find little evidence that male philopatry led to the evolution of a
post-reproductive period. However, the proportion of life spent post-reproductive
was related to lifespan and patterns of philopatry, suggesting that the duration
of PRLS may be impacted by both non-adaptive and adaptive processes. Finally, the
proportion of females experiencing PRLS was higher in species with male philopaty
and larger groups, in accordance with adaptive models of PRLS. We suggest that
the origin of PRLS primarily follows the non-adaptive 'mismatch' scenario, but
that patterns of philopatry may subsequently confer adaptive benefits of
late-life helping.