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Resumen del producto
Baró-Camarasa, I., A.J., Marmolejo-Rodríguez, T.M., O'Hara, F.R., Elorriaga-Verplancken, A., Trejo-Ramírez, R.O., Martínez-Rincón & F., Galván-Magaña
(2021).
Isotopic (d15N) relationship of pregnant females and their embryos: Comparing placental and yolk-sac viviparous elasmobranchs.
Journal of Fish Biology.
98(3): 784-790.
DOI: 10.1111/jfb.14625.
Isotopic (d15N) relationship of pregnant females and their embryos: Comparing placental and yolk-sac viviparous elasmobranchs
Isis Baró-Camarasa, Ana Judith Marmolejo-Rodríguez, Tood M. O'Hara, Fernando Ricardo Elorriaga-Verplancken, Abel Trejo-Ramírez, Raúl O. Martínez-Rincón y Felipe Galván-Magaña
Nitrogen stable isotopes ratios (d15N) 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 d15N (?d15N) between embryo and adult. Mean ?d15N 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 (?d15N mean = 1.22‰), whereas embryo muscle was 15N depleted relative to the muscle of the pregnant female (?d15N mean = -1.22‰). Both species presented a significant positive linear relationship between ?d15N and embryo total length (LT). The results indicated that embryos have different ?d15N depending on their reproductive strategy, tissue type analysed and embryo LT.
Palabras clave: isotopic variation; nitrogen stable isotope; Pseudobatos glaucostigmus; Rhizoprionodon longurio
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