Regional variation in multiple paternity in the brown smooth‐hound shark Mustelus henlei from the northeastern Pacific

Abstract

Multiple paternity (MP) in the brown smooth‐hound shark (Mustelus henlei) was assessed in 15 litters (15 mothers and 97 embryos) collected in the northern Gulf of California of which 86.7% were sired by more than one male (i.e., from 2 to 4 sires). When taken together with results from previous studies, this record indicates that there is regional variation in MP in M. henlei in the northeastern Pacific. This pattern is associated with variations in the reproductive traits of each population (e.g., female size and litter size). In the Gulf of California, the results of a generalized linear model (GLZ) indicated that the litters of larger females had a higher probability of MP compared to those of smaller females.

Insights into ontogenetic scaling and morphological variation in sharks from near-term brown smooth-hound (Mustelus henlei) embryos

“…There is a paucity of data regarding reproductive biology in this species (Pérez-Jiménez and Sosa-Nishizaki, 2008). Multiple paternity is known to be present in M. henlei (Chabot and Haggin, 2014;Rendón-Herrera et al, 2022), and basic information exists regarding observations of placental viviparity and variation in litter size (Yudin, 1987;Pérez-Jiménez and Sosa-Nishizaki, 2008), however no data exist regarding the morphogenesis or early ontogeny of M. henlei. A recent study did present ontogenetic growth trajectories for this species, using a large dataset of both adult and juvenile (but not neonate or embryonic) specimens (Gayford et al, 2023a).…”

Evolución de la selección sexual en la naturaleza:

“…Como evidencia de esto, diversos estudios reportan paternidad múltiple en camadas de varias especies de tiburones y rayas, en donde existe un macho que domina la paternidad de los embriones, tal es el caso del tiburón marrón Mustelus henlei (Fig. 3;Rendón-Herrera et al, 2022).…”

“…Durante su viaje notó las diferencias entre machos y hembras de varias especies de aves; principalmente que los machos cortejaban a las hembras con diversos rituales en donde el canto y la coloración del plumaje juegan un papel fundamental, a estos rasgos los Figura 3. Relaciones de hermandad entre embriones del cazón pardo, Mustelus henlei, en el Golfo de California, México (Rendón-Herrera et al 2022). En ambos ejes de la gráfica se muestran las claves de identificación de cada uno de los embriones correspondientes a seis camadas.…”