Martínez-Ayala, J.C., A., Tripp-Valdez, F., Galván-Magaña, A., Sánchez González & A.P., Klimley (2025). The trophic response of Mustelus lunulatus to the oceanic process, the Blob, in Bahía Tortugas, Baja California Sur, Mexico. Environmental Biology of Fishes. 1-10. DOI: 10.1007/s10641-025-01709-4.
Julio Cesar Martínez-Ayala 1, Arturo Tripp-Valdez 1, Felipe Galván-Magaña 1, Alberto Sánchez González 1 y A. Peter Klimley 2
Mustelus lunulatus is a species that is part of the artisanal fishery of elasmobranchs in Baja California Sur (B.C.S.), in addition to being a member of the region’s food web. Local fisheries can be affected by various oceanographic phenomena such as the Blob and El Niño events. These oceanographic phenomena can affect species composition along the food web, as well as the availability of food needed for both predators and prey (SENAMHI 2014). In the case of M. lunulatus, these phenomena could also have influenced the availability of its main prey species, since before the Blob event they were Hemisquilla californiensis and Grimothea planipes, while G. planipes and Panulirus interruptus were the main prey after the Blob. A similar trend was observed when examining carbon and nitrogen isotopic compositions, where both isotopic compositions varied slightly before and after the Blob event, indicating that it could have an effect on some of the main prey groups of M. lunulatus. It is worth mentioning that M. lunulatus feeds on prey species with similar trophic levels before and after the Blob, mainly crustaceans, which only varied at the order level before and after the event.
Palabras clave: trophic spectrum; stable isotopes; trophic overlap; Blob phenomenon; Marine heatwave
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