Reinero, F.R., E.E., Becerril-García, F.R., Elorriaga-Verplancken, F.N., Melo-Barrera, M.L., Toraldo-Serra, G., Giglio, P., Micarelli, S., Tripepi, F., Galván-Magaña & E., Sperone (2023). Stable isotopes provide evidence of a trophic shift in the lesser spotted dogfish Scyliorhinus canicula from the Central Tyrrhenian Sea. Mediterranean Marine Science. 24(1): 6. DOI: 10.12681/mms.27391.
Francesca Romana Reinero 1, Edgar Eduardo Becerril-García 2, Fernando R. Elorriaga-Verplancken 2, Felipe Neri Melo-Barrera 2, Maria Ludovica Toraldo-Serra 1, Gianni Giglio 1, Primo Micarelli 3, Sandro Tripepi 1, Felipe Galván-Magaña 2 y Emilio Sperone 1
Stable isotopes (d13C and d15N) were analysed in vertebrae of Scyliorhinus canicula (n=40; 13 males, 27females) from the central Tyrrhenian Sea to explore a potential trophic shiftin relation to sex and maturity condition. Isotopic values were obtained fromthe centre and the periphery of the vertebra of each individual to test for theeffect of maturity condition. The values of d13C and d15N showed significant differences between the immatureand mature state of the individuals analysed (U’=1392, P<0.0001 for d13C; U’=1385, P<0.0001 for d15N). Differences in values of d15N demonstrated a trophic shift during maturationprogress of S.canicula. The peripheral vertebral part, corresponding to themature state of each individual, showed higher values of d15N (mean 5.41‰ SD±1.29‰), compared with thelower values of d15N (mean 2.78‰ SD±1.52‰) observed in the centralvertebral part related to the immature state. In contrast, the isotopicsignature of d13C was lower in the vertebral centra, and thus relatedto areas less enriched in C13 (mean -22.56‰ SD±1.26‰) in comparison with thevertebral periphery (mean -20.03‰ SD±1.34‰) linked to more productiveenvironments. No significant differences in d13C or for d15N values were observed between sexes.
Palabras clave: Benthic shark; Mediterranean Sea; Scyliorhinidae; stable isotopes; vertebrae
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