RT Journal Article
SR Electronic
T1 Post-mating parental behavior trajectories differ across four species of deer mice
JF bioRxiv
FD Cold Spring Harbor Laboratory
SP 2022.09.18.508265
DO 10.1101/2022.09.18.508265
A1 Mehdi Khadraoui
A1 Jennifer R. Merritt
A1 Hopi E. Hoekstra
A1 Andres Bendesky
YR 2022
UL http://biorxiv.org/content/early/2022/09/19/2022.09.18.508265.abstract
AB Among species, parental behaviors vary in their magnitude, onset relative to reproduction, and sexual dimorphism. In deer mice (genus Peromyscus), while most species are promiscuous with low paternal care, monogamy and biparental care have evolved at least twice under different ecological conditions. Here, in a common laboratory setting, we monitored parental behaviors of males and females of two promiscuous (eastern deer mouse P. maniculatus and white-footed mouse P. leucopus) and two monogamous (oldfield mouse P. polionotus and California mouse P. californicus) species from before mating to after giving birth. In the promiscuous species, females showed parental behaviors largely after parturition, while males showed little parental care. In contrast, both sexes of monogamous species performed parental behaviors. However, while oldfield mice began to display parental behaviors before mating, California mice showed robust parental care behaviors only postpartum. These different parental-care trajectories in the two monogamous species align with their socioecology. Oldfield mice have overlapping home ranges with relatives, so infants they encounter, even if not their own, are likely to be closely related. By contrast, California mice disperse longer distances into exclusive territories with possibly unrelated neighbors, decreasing the inclusive fitness benefits of caring for unfamiliar pups before parenthood. Together, we find that patterns of parental behaviors in Peromyscus are consistent with predictions from inclusive fitness theory.Competing Interest StatementThe authors have declared no competing interest.