Like Father Like Son: Cultural and Genetic Contributions to Song Inheritance in an Estrildid Finch

Social learning of vocalizations is integral to song inheritance in oscine passerines. However, other factors, such as genetic inheritance and the developmental environment, can also influence song phenotype. The relative contributions of these factors can have a strong influence on song evolution and may affect important evolutionary processes such as speciation. However, relative contributions are well-described only for a few species and are likely to vary with taxonomy. Using archived song data, we examined patterns of song inheritance in a domestic population of Java sparrows (Lonchura oryzivora), some of which had been cross-fostered. Six-hundred and seventy-six songs from 73 birds were segmented and classified into notes and note subtypes (N = 22,972), for which a range of acoustic features were measured. Overall, we found strong evidence for cultural inheritance of song structure and of the acoustic characteristics of notes; sons’ song syntax and note composition were similar to that of their social fathers and were not influenced by genetic relatedness. For vocal consistency of note subtypes, a measure of vocal performance, there was no apparent evidence of social or genetic inheritance, but both age and developmental environment influenced consistency. These findings suggest that high learning fidelity of song material, i.e., song structure and note characteristics, could allow novel variants to be preserved and accumulate over generations, with implications for evolution and conservation. However, differences in vocal performance do not show strong links to cultural inheritance, instead potentially serving as condition dependent signals.

Coresidential Father Transitions and Biological Parents’ Coparenting Quality in Early and Middle Childhood

This study examined how the entrances and exits of biological and social fathers into and out of children’s households were associated with biological parents’ coparenting quality. Piecewise growth curve models tested for variation in these associations between child ages 1 and 3, 3 and 5, and 5 and 9. Data came from the Fragile Families and Child Wellbeing Study ( n = 2,394). Results indicated that in all three age intervals, a biological father’s entrance was associated with a contemporaneous increase in coparenting quality, whereas his exit was associated with a contemporaneous decrease. A biological father’s exit between child ages 1 and 3, or 3 and 5, was associated with declining coparenting quality in subsequent intervals. A social father’s entrance was consistently associated with a contemporaneous decrease in the biological parents’ coparenting quality, whereas his exit was associated with a contemporaneous increase between ages 3 and 5, and 5 and 9.

“ . . . I Should Maintain a Healthy Life Now and Not Just Live as I Please . . . ”

This study examines the social context of men’s health and health behaviors in rural KwaZulu-Natal, South Africa, particularly in relationship to fathering and fatherhood. Individual interviews and focus groups were conducted with 51 Zulu-speaking men. Three themes related to men’s health emerged from the analysis of transcripts: (a) the interweaving of health status and health behaviors in descriptions of “good” and “bad” fathers, (b) the dominance of positive accounts of health and health status in men’s own accounts, and (c) fathers’ narratives of transformations and positive reinforcement in health behaviors. The study reveals the pervasiveness of an ideal of healthy fathers, one in which the health of men has practical and symbolic importance not only for men themselves but also for others in the family and community. The study also suggests that men hold in esteem fathers who manage to be involved with their biological children who are not coresident or who are playing a fathering role for nonbiological children (social fathers). In South Africa, men’s health interventions have predominantly focused on issues related to HIV and sexual health. The new insights obtained from the perspective of men indicate that there is likely to be a positive response to health interventions that incorporate acknowledgment of, and support for, men’s aspirations and lived experiences of social and biological fatherhood. Furthermore, the findings indicate the value of data on men’s involvement in families for men’s health research in sub-Saharan Africa.

Sons learn songs from their social fathers in a cooperatively breeding bird

Song learning is hypothesized to allow social adaptation to a local song neighbourhood. Maintaining social associations is particularly important in cooperative breeders, yet vocal learning in such species has only been assessed in systems where social association was correlated with relatedness. Thus, benefits of vocal learning as a means of maintaining social associations could not be disentangled from benefits of kin recognition. We assessed genetic and cultural contributions to song in a species where social association was not strongly correlated with kinship: the cooperatively breeding, reproductively promiscuous splendid fairy-wren ( Malurus splendens ). We found that song characters of socially associated father–son pairs were more strongly correlated (and thus songs were more similar) than songs of father–son pairs with a genetic, but no social, association (i.e. cuckolding fathers). Song transmission was, therefore, vertical and cultural, with minimal signatures of kinship. Additionally, song characters were not correlated with several phenotypic indicators of male quality, supporting the idea that there may be a tradeoff between accurate copying of tutors and quality signalling via maximizing song performance, particularly when social and genetic relationships are decoupled. Our results lend support to the hypothesis that song learning facilitates the maintenance of social associations by permitting unrelated individuals to acquire similar signal phenotypes.