Resumen del producto

Rationale: Billfishes, such as marlin, are top pelagic predators that play an important role in maintaining the stability of marine food webs. Notwithstanding the importance of these species, there remain gaps in our knowledge on their movements, foraging, and trophic status in the early stage of life. METHODS: We measured the ?13C and ?15N values in each annual growth band deposited in the dorsal spine from striped marlin caught off Cabo San Lucas, Mexico, to produce retrospective isotopic profiles that would enable us to detect any significant isotopic changes across development. The samples were analyzed using an elemental analyzer coupled to an isotope ratio mass spectrometer. RESULTS: There was no relationship between the size of striped marlin and the ?15N values. Differences in ?15N mean values across different age classes were not significant and the variation in ?15N values through the marlins’ life cycle was less than 2‰. However, the mean ?15N values between individuals varied by up to 6‰. The ?13C values increased as a function of age, and the mean ?13C values varied significantly between age classes. CONCLUSIONS: Fin spines can be used to construct retrospective isotopic histories for the investigation of trophic dynamics and migratory histories in billfishes, for which population dynamics are often poorly known.

Palabras clave: Striped marlin; Guadalupe fur seal; spine

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