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Conflict and the evolution of viviparity in vertebrates

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Abstract

Viviparity has evolved from oviparity approximately 142 times among vertebrates. Different theories have been proposed to explain the evolution of each of its traits in the different taxa. None, however, is applicable to all the viviparous vertebrates, since the derived ecological advantages such as controlling incubating temperature or protecting eggs against predation differ amongst clades. Most theories have been developed under a co-adaptive perspective, whereas less attention has been paid to conflict. We developed a broad panorama of the gradual evolution, from oviparity to advanced forms of viviparity, that includes the different environmental and co-adaptive selective pressures that have been suggested to be at the root of the different instances of viviparity and of the diverse maternal–foetal adaptations for nutrient transfer seen amongst vertebrates. Furthermore, we highlight the importance of conflict as a crucial driver of the evolution of many of those traits, including the evolution of epigenetic control of maternal resources. We suggest that the different types of matrotrophic viviparity, and probably also some reversals to oviparity, have been the result of an antagonistic coevolution between mothers, fathers and offspring, and their genomes. We additionally suggest that the appearance of a trait that allowed or favoured the evolution of internal development and matrotrophy generates a new selective environment that promotes further adaptations or counteradaptations, leading to the observed diversity of forms of embryonic development, nourishment, and transfer of maternal nutrients, and ultimately to the diversity of extant viviparous taxa.

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Acknowledgements

We thank Michael G. Ritchie for providing the parenthetical notation of the phylogeny of goodeids and for his comments on an earlier version of the manuscript, and Marcela Méndez-Janovitz and Nadia Neri-Vera for their guide during the construction of phylogenetic trees. YSL is grateful to the Doctorado en Ciencias Biomédicas (UNAM) and to CONACyT for providing a PhD scholarship (No. 46568). This manuscript was much improved thanks to the comments of two referees.

Funding

CONACyT provided a PhD scholarship (No. 46568) for YS-L.

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Authors contributed equally to this work. YS-L conceived the review, conducted the literature search, and generated a first draft that was subsequently reworked jointly by both YS-L and CMG.

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Correspondence to Constantino Macías Garcia.

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This is not an empirical study, but a review, and no animals or humans were used to gather any data.

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The authors declare that there is no conflict of interest.

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Communicated by F. Trillmich.

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Saldívar-Lemus, Y., Macías Garcia, C. Conflict and the evolution of viviparity in vertebrates. Behav Ecol Sociobiol 76, 68 (2022). https://doi.org/10.1007/s00265-022-03171-z

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  • DOI: https://doi.org/10.1007/s00265-022-03171-z

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  1. Constantino Macías Garcia