No evidence for female kin association, indications for extragroup paternity, and sex‐biased dispersal patterns in wild western gorillas

Autor: Masi, Shelly, Austerlitz, Frédéric, Chabaud, Chloé, Lafosse, Sophie, Marchi, Nina, Georges, Myriam, Dessarps‐Freichey, Françoise, Miglietta, Silvia, Sotto‐Mayor, Andrea, Galli, Aurore San, Meulman, Ellen, Pouydebat, Emmanuelle, Krief, Sabrina, Todd, Angelique, Fuh, Terence, Breuer, Thomas, Ségurel, Laure
Přispěvatelé: Muséum national d'Histoire naturelle (MNHN), Éco-Anthropologie (EAE), Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS), Mécanismes Adaptatifs et Evolution (MECADEV), World Wide Fund (WWF), Wildlife Conservation Society (WCS), Laboratoire de Biométrie et Biologie Evolutive - UMR 5558 (LBBE), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-VetAgro Sup - Institut national d'enseignement supérieur et de recherche en alimentation, santé animale, sciences agronomiques et de l'environnement (VAS)-Centre National de la Recherche Scientifique (CNRS), Éco-Anthropologie (EA)
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Zdroj: Ecology and Evolution
Ecology and Evolution, Wiley Open Access, 2021, 11 (12), pp.7634-7646. ⟨10.1002/ece3.7596⟩
Ecology and Evolution, 2021, 11 (12), pp.7634-7646. ⟨10.1002/ece3.7596⟩
Ecology and Evolution, Vol 11, Iss 12, Pp 7634-7646 (2021)
ISSN: 2045-7758
DOI: 10.1002/ece3.7596⟩
Popis: Characterizing animal dispersal patterns and the rational behind individuals’ transfer choices is a long‐standing question of interest in evolutionary biology. In wild western gorillas (Gorilla gorilla), a one‐male polygynous species, previous genetic findings suggested that, when dispersing, females might favor groups with female kin to promote cooperation, resulting in higher‐than‐expected within‐group female relatedness. The extent of male dispersal remains unclear with studies showing conflicting results. To investigate male and female dispersal patterns and extragroup paternity, we analyzed long‐term field observations, including female spatial proximity data, together with genetic data (10 autosomal microsatellites) on individuals from a unique set of four habituated western gorilla groups, and four additional extragroup males (49 individuals in total). The majority of offspring (25 of 27) were sired by the group male. For two offspring, evidence for extragroup paternity was found. Contrarily to previous findings, adult females were not significantly more related within groups than across groups. Consistently, adult female relatedness within groups did not correlate with their spatial proximity inferred from behavioral data. Adult females were similarly related to adult males from their group than from other groups. Using R ST statistics, we found significant genetic structure and a pattern of isolation by distance, indicating limited dispersal in this species. Comparing relatedness among females and among males revealed that males disperse farer than females, as expected in a polygamous species. Our study on habituated western gorillas shed light on the dispersal dynamics and reproductive behavior of this polygynous species and challenge some of the previous results based on unhabituated groups.
We found evidence for extra‐group paternity for two offspring. Adult females were not significantly more related within groups than between groups and were similarly related to adult males from their group than from other groups. Comparing relatedness among females and among males revealed that males disperse farer than females.
Databáze: OpenAIRE
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