Depredación de Ctenosaura pectinata (Squamata: Iguanidae) por Lynx rufus (Carnivora: Felidae) en el Estado de Michoacán de Ocampo, México

El gato montés o lince rojo (Lynx rufus), es un felino de talla mediana con una amplia distribución en México y Norteamérica, para el cual se ha documentado su dieta a lo largo de toda su área de distribución, siendo los lagomorfos y los roedores sus principales presas. Mediante un monitoreo con cámaras trampa, se documenta la primera evidencia de la presencia de la iguana negra (Ctenosaura pectinata) en la dieta del gato montés. Además de la presencia de gato montés se registraron cinco especies de felinos; puma (Puma concolor), jaguarundi (Herpailurus yagouaroundi), tigrillo (Lepoardus wiedii), ocelote (Leopardus pardalis) y jaguar (Panthera onca). Estudios posteriores, deben evaluar el traslape de nicho y preferencia de hábitos alimenticios de los felinos presentes en esta región del pais, donde coexisten las seis especies de felinos que habitan en México.

Introgressive hybridization in a Spiny-Tailed Iguana, Ctenosaura pectinata, and its implications for taxonomy and conservation

Introgression, the transmission of genetic material of one taxon into another through hybridization, can have various evolutionary outcomes. Previous studies have detected signs of introgression between western populations of the Mexican endemic and threatened spiny-tailed iguana, Ctenosaura pectinata. However, the extent of this phenomenon along the geographic distribution of the species is unknown. Here, we use multilocus data together with detailed geographic sampling to (1) define genotypic clusters within C. pectinata; (2) evaluate geographic concordance between maternally and biparentally inherited markers; (3) examine levels of introgression between genotypic clusters, and (4) suggest taxonomic modifications in light of this information. Applying clustering methods to genotypes of 341 individuals from 49 localities of C. pectinata and the closely related C. acanthura, we inferred the existence of five genotypic clusters. Contact zones between genotypic clusters with signatures of interbreeding were detected, showing different levels of geographic discordance with mtDNA lineages. In northern localities, mtDNA and microsatellites exhibit concordant distributions, supporting the resurrection of C. brachylopha. Similar concordance is observed along the distribution of C. acanthura, confirming its unique taxonomic identity. Genetic and geographic concordance is also observed for populations within southwestern Mexico, where the recognition of a new species awaits in depth taxonomic revision. In contrast, in western localities a striking pattern of discordance was detected where up to six mtDNA lineages co-occur with only two genotypic clusters. Given that the type specimen originated from this area, we suggest that individuals from western Mexico keep the name C. pectinata. Our results have profound implications for conservation, management, and forensics of Mexican iguanas.

Canibalismo en ctenosaura pectinata (squamata: iguanidae) en el parque nacional isla Isabel, Nayarit, México

RESUMEN. Ctenosaura pectinata es una iguana endémica de México y está considerada como amenazada de acuerdo con la Norma NOM-059-2010-SEMARNAT. Las evidencias fotográficas muestran el primer registro de canibalismo de C. pectinata en el Parque Nacional Isla Isabel.