TY - JOUR
T1 - Isotopic (δ15N) relationship of pregnant females and their embryos
T2 - Comparing placental and yolk-sac viviparous elasmobranchs
AU - Baró-Camarasa, Isis
AU - Marmolejo-Rodríguez, Ana J.
AU - O'Hara, Todd M.
AU - Elorriaga-Verplancken, Fernando R.
AU - Trejo-Ramírez, Abel
AU - Martínez-Rincón, Raúl O.
AU - Galván-Magaña, Felipe
N1 - Publisher Copyright:
© 2020 Fisheries Society of the British Isles
PY - 2021/3
Y1 - 2021/3
N2 - 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.
AB - 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.
KW - Pseudobatos glaucostigmus
KW - Rhizoprionodon longurio
KW - isotopic variation
KW - nitrogen stable isotope
UR - http://www.scopus.com/inward/record.url?scp=85097420308&partnerID=8YFLogxK
U2 - 10.1111/jfb.14625
DO - 10.1111/jfb.14625
M3 - Artículo
C2 - 33230841
AN - SCOPUS:85097420308
SN - 0022-1112
VL - 98
SP - 784
EP - 790
JO - Journal of Fish Biology
JF - Journal of Fish Biology
IS - 3
ER -