Incorporating effects of age on energy dynamics predicts nonlinear maternal allocation patterns in iteroparous animals

Barreaux Antoine, Higginson Andrew D., Bonsall Michael B., English Sinead. 2022. Incorporating effects of age on energy dynamics predicts nonlinear maternal allocation patterns in iteroparous animals. Proceedings of the Royal Society B: Biological Sciences, 289 (1969):20211884, 10 p.

Url - jeu de données - Entrepôt autre : https://doi.org/10.5061/dryad.v41ns1rxr / Url - jeu de données - Entrepôt autre : https://doi.org/10.5281/zenodo.5763522 / Url - jeu de données - Entrepôt autre : https://doi.org/10.5281/zenodo.5763524 / Url - jeu de données - Entrepôt autre : https://doi.org/10.6084/m9.figshare.c.5820931.v1

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie

Résumé : Iteroparous parents face a trade-off between allocating current resources to reproduction versus maximizing survival to produce further offspring. Parental allocation varies across age and follows a hump-shaped pattern across diverse taxa, including mammals, birds and invertebrates. This nonlinear allocation pattern lacks a general theoretical explanation, potentially because most studies focus on offspring number rather than quality and do not incorporate uncertainty or age-dependence in energy intake or costs. Here, we develop a life-history model of maternal allocation in iteroparous animals. We identify the optimal allocation strategy in response to stochasticity when energetic costs, feeding success, energy intake and environmentally driven mortality risk are age-dependent. As a case study, we use tsetse, a viviparous insect that produces one offspring per reproductive attempt and relies on an uncertain food supply of vertebrate blood. Diverse scenarios generate a hump-shaped allocation when energetic costs and energy intake increase with age and also when energy intake decreases and energetic costs increase or decrease. Feeding success and environmentally driven mortality risk have little influence on age-dependence in allocation. We conclude that ubiquitous evidence for age-dependence in these influential traits can explain the prevalence of nonlinear maternal allocation across diverse taxonomic groups.

Mots-clés Agrovoc : dynamique des populations, modèle de simulation, effet maternel, Invertébré, modèle mathématique, prise alimentaire (animaux)

Mots-clés libres : Life-history theory, Tsetse, Ageing, Maternal allocation, Evolution, Energy dynamics

Champ stratégique Cirad : CTS 1 (2019-) - Biodiversité

Auteurs et affiliations

• Barreaux Antoine, CIRAD-BIOS-UMR INTERTRYP (FRA) ORCID: 0000-0001-5822-761X - auteur correspondant
• Higginson Andrew D., University of Exeter (GBR)
• Bonsall Michael B., University of Oxford (GBR)
• English Sinead, University of Bristol (GBR)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/601684/)

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