Isotopic (δ15N) relationship of pregnant females and their embryos: Comparing placental and yolk-sac viviparous elasmobranchs

Isis Baró-Camarasa, Ana J. Marmolejo-Rodríguez, Todd M. O'Hara, Fernando R. Elorriaga-Verplancken, Abel Trejo-Ramírez, Raúl O. Martínez-Rincón, Felipe Galván-Magaña

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Resumen

Nitrogen stable isotopes ratios (δ15N) were determined for selected tissues (muscle, liver, blood and yolk) of pregnant females and their embryos of a placental viviparous species, the Pacific sharpnose shark (Rhizoprionodon longurio), and a yolk-sac viviparous species, the speckled guitarfish (Pseudobatos glaucostigmus). The R. longurio embryo tissues were 15N enriched compared to the same tissues in the pregnant female, using the difference in δ15N (Δδ15N) between embryo and adult. Mean Δδ15N was 2.17‰ in muscle, 4.39‰ in liver and 0.80‰ in blood. For P. glaucostigmus, embryo liver tissue was significantly 15N enriched in comparison with liver of the pregnant female (Δδ15N mean = 1.22‰), whereas embryo muscle was 15N depleted relative to the muscle of the pregnant female (Δδ15N mean = −1.22‰). Both species presented a significant positive linear relationship between Δδ15N and embryo total length (LT). The results indicated that embryos have different Δδ15N depending on their reproductive strategy, tissue type analysed and embryo LT.

Idioma originalInglés
Páginas (desde-hasta)784-790
Número de páginas7
PublicaciónJournal of Fish Biology
Volumen98
N.º3
DOI
EstadoPublicada - mar. 2021
Publicado de forma externa

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