Resumen del producto

The shovelnose guitarfish, Pseudobatos productus (Ayres 1854), is a benthic elasmobranch that lives in shallow waters from Monterey Bay, California to the Gulf of California, Mexico, and is targeted by fisheries throughout Baja California and the Gulf of California. In many cases, localized fishing pressure can lead to a loss of genetic diversity, a reduction in effective population size, and local extinction. The most recent IUCN assessment of P. productus lists the species as Near Threatened with a decreasing population trend and a continuing decline in the number of mature individuals (Farrugia et al. 2016). This study sought to assess the genetic diversity and connectivity of P. productus from San Pedro, CA to Guerrero Negro, Baja California Sur, MX. Genetic diversity and connectivity were assessed using the complete mitochondrial control region as well as genomic SNP data produced by RAD-seq. Both markers show evidence of high levels of connectivity from southern California to northern Baja California Sur, indicating admixture across international boundaries. Mitochondrial DNA evidence supports higher levels of population structure while genomic SNP data supports panmixia between localities. This may be indicative of sex-specific movement patterns, with higher levels of male-mediated geneflow between localities. Based on these data, P. productus should be managed as a bi-national species with sex-based restrictions as males contribute more to genetic admixture than females.

Palabras clave: Pseudobatos productus; Baja California Sur; Genetic diversity; Connectivity

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