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Stable isotopes (?¹³C, ?¹⁵N) were used to assess differences in the diets of wild adult Haliotis fulgens and Haliotis corrugata. Temporal variations in the diets of these species were compared using specimens collected monthly during one annual cycle in Laguna La Bocana, whereas comparisons were made with samples taken in October 2012 in Bahía Tortugas. The two species of abalone have different feeding habits year round; H. corrugate showed a constant ?¹⁵N pattern (between 9.5‰ and 10.4‰), whereas H. fulgens exhibited a seasonal ?¹⁵Npattern [the lowest frequency (9.5‰) occurred in September and the highest (11.8‰) in December], which might indicate that this species fed on the resources that were available at the time. The ?¹³C pattern showed that Laguna La Bocana had depleted values in relation to Bahia Tortugas, indicating different carbon sources. The fact that the ?¹⁵Npattern of abalone was below the known food sources (macroalgae), suggests the presence of other sources in the diet of adult abalone, such as detritus or epiphytic diatoms.

Palabras clave: Guadalupe fur seal; Haliotis fulgens; feeding; pink abalone; green abalone; Haliotis corrugate

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