Divergence of developmental trajectories is triggered interactively by early social and ecological experience in a cooperative breeder



Fischer, Stefan ORCID: 0000-0001-8811-7518, Bohn, Lena, Oberhummer, Evelyne, Nyman, Cecilia and Taborsky, Barbara
(2017) Divergence of developmental trajectories is triggered interactively by early social and ecological experience in a cooperative breeder. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 114 (44). E9300-E9307.

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Abstract

Cooperative breeders feature the highest level of social complexity among vertebrates. Environmental constraints foster the evolution of this form of social organization, selecting for both well-developed social and ecological competences. Cooperative breeders pursue one of two alternative social trajectories: delaying reproduction to care for the offspring of dominant breeders or dispersing early to breed independently. It is yet unclear which ecological and social triggers determine the choice between these alternatives and whether diverging developmental trajectories exist in cooperative vertebrates predisposing them to dispersal or philopatry. Here we experimentally reared juveniles of cooperatively breeding cichlid fish by varying the social environment and simulated predation threat in a two-by-two factorial long-term experiment. First, we show that individuals develop specialized behavioral competences, originating already in the early postnatal phase. Second, these specializations predisposed individuals to pursue different developmental trajectories and either to disperse early or to extend philopatry in adulthood. Thus, our results contrast with the proposition that social specializations in early ontogeny should be restricted to eusocial species. Importantly, social and ecological triggers were both required for the generation of divergent life histories. Our results thus confirm recent predictions from theoretical models that organisms should combine relevant information from different environmental cues to develop integrated phenotypes.

Item Type: Article
Uncontrolled Keywords: developmental plasticity, early-life effects, social competence, antipredator behavior, cooperation
Depositing User: Symplectic Admin
Date Deposited: 10 Oct 2017 07:15
Last Modified: 19 Jan 2023 06:53
DOI: 10.1073/pnas.1705934114
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3009882