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Isotopic ( δ 15 N ) relationship of pregnant females and their embryos: Comparing placental and yolk‐sac viviparous elasmobranchs
Author(s) -
BaróCamarasa Isis,
MarmolejoRodríguez Ana J.,
O'Hara Todd M.,
ElorriagaVerplancken Fernando R.,
TrejoRamírez Abel,
MartínezRincón Raúl O.,
GalvánMagaña Felipe
Publication year - 2021
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/jfb.14625
Subject(s) - biology , embryo , yolk sac , yolk , andrology , anatomy , placenta , pregnancy , fetus , ecology , genetics , medicine
Nitrogen stable isotopes ratios (δ 15 N) 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 15 N enriched compared to the same tissues in the pregnant female, using the difference in δ 15 N (Δδ 15 N) between embryo and adult. Mean Δδ 15 N was 2.17‰ in muscle, 4.39‰ in liver and 0.80‰ in blood. For P. glaucostigmus , embryo liver tissue was significantly 15 N enriched in comparison with liver of the pregnant female (Δδ 15 N mean = 1.22‰), whereas embryo muscle was 15 N depleted relative to the muscle of the pregnant female (Δδ 15 N mean = −1.22‰). Both species presented a significant positive linear relationship between Δδ 15 N and embryo total length ( L T ). The results indicated that embryos have different Δδ 15 N depending on their reproductive strategy, tissue type analysed and embryo L T .