Regresar

Resumen del producto

Preciado-González, P., M., Hoyos-Padilla, R., González-Armas, J., Ketchum-Mejia, F., Galván-Magaña, M., Zetina-Rejon, E., Higuera-Rivera, G., Saad-Navarro, A., Ayala-Bocos, D., Ramírez-Macías, P., Ahuja, P., Ruffo-Ruffo, B.I., González-Garza, F., Lara-Lizardi & L., Meza (2020). Movements and residency of giant mantas at an isolated pinnacle in the southern Gulf of California. Northeast Pacific Shark Symposium IV. La Pa, Baja California Sur, México, marzo 5 - 7, 2020, 1.

Movements and residency of giant mantas at an isolated pinnacle in the southern Gulf of California

Paul Preciado-González, Mauricio Hoyos-Padilla, Rogelio González-Armas, James Ketchum-Mejia, Felipe Galván-Magaña, Manuel Zetina-Rejon, E. Higuera-Rivera, G. Saad-Navarro, Arturo Ayala-Bocos, D. Ramírez-Macías, P. Ahuja, P. Ruffo-Ruffo, B.I. González-Garza, Frida Lara-Lizardi y L. Meza

Vulnerable giant manta ray (Mobula birostris) returned to La Reina, an isolated offshore pinnacle in the Gulf of California, in the summer of 2018 after 16 years of absence. The reasons for this long-term disappearance are still unknown. Mantas are commonly found around upwelling areas, seamounts and oceanic islands, where they aggregate at cleaning stations. Due to their slow moving and inquisitive nature they have become an attraction for recreational divers in many places around the world. In the Gulf of California, several sites, including La Reina, were considered important for manta watching in the 1990s and early 2000s, but no mantas were seen after 2002. Juvenile mantas were recorded again in 2018. Therefore, this study analyzes the movements and residency of oceanic manta rays in La Reina, their connectivity to other areas as well as possible reasons of their presence/absence. We used photo ID and passive acoustic telemetry to understand location in time and space, in situ temperature data and satellite imagery, as well as historical records to relate with the presence/absence misery of mantas at this isolated location. Three mantas were tagged with acoustic transmitters in the summer of 2018 and were monitored with an array of acoustic receivers. A total of 3,589 acoustic detections were recorded at La Reina from July 30th to October 22nd, 2018, and no detections at other sites. Mantas displayed high daytime residency and moved away from the receiver during the night. Fifteen mantas were identified: seven males, six females and two undetermined. There were no acoustic detections in 2019 but there were six records of mantas: three 3 new mantas and three recaptures (sighted in 2018). From 1999 to 2002, 52 individuals of oceanic mantarays were identified at La Reina; after that, only three individuals in 2016. Our hypothesis for this includes intensive fishing practices combined with environmental factors in the area and possibly unknown manta ray aggregation patterns.

Palabras clave: acoustic telemetry; photo ID; Temperature

Para obtener una copia del documento contacta la personal de la biblioteca a través del correo bibliocicimar{a}ipn.mx

Regresar