Exposure to novel females increases fecundity in adult male prairie voles DOI Creative Commons

Jessica A. Hurd,

Yurika Watanabe,

Gracie J. Toben

et al.

bioRxiv (Cold Spring Harbor Laboratory), Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 20, 2024

Social circuitry of the mammalian brain can influence male reproductive physiology. This often manifests as plasticity in sperm production or allocation, particularly response to male-male competition. However, socially mediated testicular has not been investigated with respect mating and parental strategy. Testis mass sexually naïve female-exposed adult individuals three rodent species were compared: monogamous paternal prairie vole (Microtus ochrogaster), promiscuous non-paternal meadow pennsylvanicus), house mouse (Mus musculus). Monogamously paired males exhibited significantly larger testes greater than males. Comparatively, there no significant differences between monogamously voles mice. To investigate role olfactory cues for regulating this phenomenon voles, a group exposed soiled bedding from novel females was used. These more similar female odors, demonstrating strong social system. Further, while predictions competition theory (species promiscuity have closely related less promiscuity) are consistent prediction does hold voles. demonstrates complexity internal dynamics pressures which face evolutionary adaptions that may develop response.

Language: Английский

Sperm as a speciation phenotype in promiscuous songbirds DOI Creative Commons
Jan T. Lifjeld, Emily R. A. Cramer, Erica H. Leder

et al.

Evolution, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 1, 2024

Abstract Sperm morphology varies considerably among species. traits may contribute to speciation if they diverge fast in allopatry and cause conspecific sperm precedence upon secondary contact. However, their role driving prezygotic isolation has been poorly investigated. Here we test the hypothesis that, early process, female promiscuity promotes a reduction overlap length distributions songbird populations. We assembled data set of 20 pairs populations with known distributions, published estimate divergence time, an index derived from extrapair paternity rates or relative testis size. found that diverged more rapidly promiscuous Faster between was caused by lower variance trait species, not faster mean lengths. The reduced is presumably due stronger stabilizing selection on mediated competition. If divergent optima causes sympatry, which remains be shown empirically, promote isolation, rapid songbirds.

Language: Английский

Citations

1
Exposure to novel females increases fecundity in adult male prairie voles DOI Creative Commons

Jessica A. Hurd,

Yurika Watanabe,

Gracie J. Toben

et al.

bioRxiv (Cold Spring Harbor Laboratory), Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 20, 2024

Social circuitry of the mammalian brain can influence male reproductive physiology. This often manifests as plasticity in sperm production or allocation, particularly response to male-male competition. However, socially mediated testicular has not been investigated with respect mating and parental strategy. Testis mass sexually naïve female-exposed adult individuals three rodent species were compared: monogamous paternal prairie vole (Microtus ochrogaster), promiscuous non-paternal meadow pennsylvanicus), house mouse (Mus musculus). Monogamously paired males exhibited significantly larger testes greater than males. Comparatively, there no significant differences between monogamously voles mice. To investigate role olfactory cues for regulating this phenomenon voles, a group exposed soiled bedding from novel females was used. These more similar female odors, demonstrating strong social system. Further, while predictions competition theory (species promiscuity have closely related less promiscuity) are consistent prediction does hold voles. demonstrates complexity internal dynamics pressures which face evolutionary adaptions that may develop response.

Language: Английский

Citations

0