1. Kinship analysis of an aggregation of the endangered skate Raja undulata reveals high genetic connectivity with implications for its conservation
- Author
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Alonso Fernández, Alexandre, Casas Castaño, Laura, Universidad de Alicante. Departamento de Ciencias del Mar y Biología Aplicada, López Aguilar, Miguel, Alonso Fernández, Alexandre, Casas Castaño, Laura, Universidad de Alicante. Departamento de Ciencias del Mar y Biología Aplicada, and López Aguilar, Miguel
- Abstract
The current state of decline of elasmobranch stocks is fuelled by overfishing and a lack of ecological and biological knowledge on many of the exploited species. Several of these sharks and rays species have shown complex behaviours and sociality that influence their distribution and ecology, both determinant factors for their management. The present work focuses on the undulate ray (Raja undulata), a commercially important skate classified as endangered in 2009 by the IUCN. In NW Spain (Galicia), its population and genetic structure – as well as basic biological and ecological knowledge – remains unknown, while available abundance indexes have revealed a decreasing trend in the last years. We used genetic and acoustic telemetry tools to assess the genetic structure, spatial distribution, and the interaction of both in a dense aggregation of undulate rays located within the Cíes Islands MPA. For this, 108 specimens were characterized using eight microsatellite markers that revealed a highly connected genetic network, with almost all its individuals genetically related through at least one first-order relationship. While previous studies had demonstrated the patchy distribution of the undulate ray, this is the first work addressing the genetic structure of these ‘patches’. The species’ local population aggregates seasonally, and skates were found to have up to 10-11 direct relatives within the aggregation area. Furthermore, telemetry data from the 85 tagged skates revealed that bigger females use less space in common between them than their smaller counterparts, while bigger males were found to do the opposite. Our results demonstrate how kinship is likely to be influencing the distribution of this elasmobranch species, either by means of genetic relatedness or familiarity, and lay the foundation for the long-term monitoring, conservation and future management of the species.
- Published
- 2024