Comparative life history patterns of female gorillas.
female
fertility
gorilla
intrinsic mortality
life history
phenotypic plasticity
Journal
American journal of biological anthropology
ISSN: 2692-7691
Titre abrégé: Am J Biol Anthropol
Pays: United States
ID NLM: 101770171
Informations de publication
Date de publication:
08 2023
08 2023
Historique:
revised:
16
03
2023
received:
20
10
2022
accepted:
24
05
2023
medline:
23
10
2023
pubmed:
22
6
2023
entrez:
22
6
2023
Statut:
ppublish
Résumé
Several theories have been proposed to explain the impact of ecological conditions on differences in life history variables within and between species. Here we compare female life history parameters of one western lowland gorilla population (Gorilla gorilla gorilla) and two mountain gorilla populations (Gorilla beringei beringei). We compared the age of natal dispersal, age of first birth, interbirth interval, and birth rates using long-term demographic datasets from Mbeli Bai (western gorillas), Bwindi Impenetrable National Park and the Virunga Massif (mountain gorillas). The Mbeli western gorillas had the latest age at first birth, longest interbirth interval, and slowest surviving birth rate compared to the Virunga mountain gorillas. Bwindi mountain gorillas were intermediate in their life history patterns. These patterns are consistent with differences in feeding ecology across sites. However, it is not possible to determine the evolutionary mechanisms responsible for these differences, whether a consequence of genetic adaptation to fluctuating food supplies ("ecological risk aversion hypothesis") or phenotypic plasticity in response to the abundance of food ("energy balance hypothesis"). Our results do not seem consistent with the extrinsic mortality risks at each site, but current conditions for mountain gorillas are unlikely to match their evolutionary history. Not all traits fell along the expected fast-slow continuum, which illustrates that they can vary independently from each other ("modularity model"). Thus, the life history traits of each gorilla population may reflect a complex interplay of multiple ecological influences that are operating through both genetic adaptations and phenotypic plasticity.
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
564-574Subventions
Organisme : Max Planck Society
Organisme : United States Fish and Wildlife Service Great Ape Fund
Organisme : Berggorilla Regenwald Direkthilfe
Organisme : National Science Foundation
ID : BCS 1753651
Informations de copyright
© 2023 The Authors. American Journal of Biological Anthropology published by Wiley Periodicals LLC.
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