Multifaceted density dependence: Social structure and seasonality effects on Serengeti lion demography.
Bayesian models
demographic rates
density dependence
density–environment interactions
multistate capture–recapture models
sociality
Journal
The Journal of animal ecology
ISSN: 1365-2656
Titre abrégé: J Anim Ecol
Pays: England
ID NLM: 0376574
Informations de publication
Date de publication:
30 Jul 2024
30 Jul 2024
Historique:
received:
30
10
2023
accepted:
27
06
2024
medline:
31
7
2024
pubmed:
31
7
2024
entrez:
31
7
2024
Statut:
aheadofprint
Résumé
Interactions between density and environmental conditions have important effects on vital rates and consequently on population dynamics and can take complex pathways in species whose demography is strongly influenced by social context, such as the African lion, Panthera leo. In populations of such species, the response of vital rates to density can vary depending on the social structure (e.g. effects of group size or composition). However, studies assessing density dependence in populations of lions and other social species have seldom considered the effects of multiple socially explicit measures of density, and-more particularly for lions-of nomadic males. Additionally, vital-rate responses to interactions between the environment and various measures of density remain largely uninvestigated. To fill these knowledge gaps, we aimed to understand how a socially and spatially explicit consideration of density (i.e. at the local scale) and its interaction with environmental seasonality affect vital rates of lions in the Serengeti National Park, Tanzania. We used a Bayesian multistate capture-recapture model and Bayesian generalized linear mixed models to estimate lion stage-specific survival and between-stage transition rates, as well as reproduction probability and recruitment, while testing for season-specific effects of density measures at the group and home-range levels. We found evidence for several such effects. For example, resident-male survival increased more strongly with coalition size in the dry season compared with the wet season, and adult-female abundance affected subadult survival negatively in the wet season, but positively in the dry season. Additionally, while our models showed no effect of nomadic males on adult-female survival, they revealed strong effects of nomads on key processes such as reproduction and takeover dynamics. Therefore, our results highlight the importance of accounting for seasonality and social context when assessing the effects of density on vital rates of Serengeti lions and of social species more generally.
Identifiants
pubmed: 39080877
doi: 10.1111/1365-2656.14158
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Subventions
Organisme : Division of Environmental Biology
ID : BE-0308486
Organisme : Division of Environmental Biology
ID : DEB-0343960
Organisme : Division of Environmental Biology
ID : DEB-0918142
Organisme : Division of Environmental Biology
ID : DEB-1020479
Organisme : Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
ID : 31003A_182286
Informations de copyright
© 2024 The Author(s). Journal of Animal Ecology published by John Wiley & Sons Ltd on behalf of British Ecological Society.
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