Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas, La Paz, Mexico.
Bilingual Laboratory of Toxicology, Department of Veterinary Integrative Biosciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, Texas, USA.
J Fish Biol. 2021 Mar;98(3):784-790. doi: 10.1111/jfb.14625. Epub 2020 Dec 12.
Nitrogen stable isotopes ratios (δ 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 N enriched compared to the same tissues in the pregnant female, using the difference in δ N (Δδ N) between embryo and adult. Mean Δδ N was 2.17‰ in muscle, 4.39‰ in liver and 0.80‰ in blood. For P. glaucostigmus, embryo liver tissue was significantly N enriched in comparison with liver of the pregnant female (Δδ N mean = 1.22‰), whereas embryo muscle was N depleted relative to the muscle of the pregnant female (Δδ N mean = -1.22‰). Both species presented a significant positive linear relationship between Δδ N and embryo total length (L ). The results indicated that embryos have different Δδ N depending on their reproductive strategy, tissue type analysed and embryo L .
氮稳定同位素比值（δ N）被测定为怀孕雌性及其胚胎的选定组织（肌肉、肝脏、血液和卵黄），来自胎盘胎生物种，即太平洋尖吻鲨（Rhizoprionodon longurio），和卵黄囊胎生物种，斑点吉他鱼（Pseudobatos glaucostigmus）。与怀孕雌性的同一组织相比，R. longurio 胚胎组织中的 N 更为丰富，使用胚胎和成年个体之间的 δ N 差异（Δδ N）。肌肉中的平均 Δδ N 为 2.17‰，肝脏为 4.39‰，血液为 0.80‰。对于 P. glaucostigmus，与怀孕雌性的肝脏相比，胚胎肝脏组织的 N 明显更为丰富（Δδ N 平均值=1.22‰），而胚胎肌肉相对于怀孕雌性的肌肉则呈现出 N 贫化（Δδ N 平均值=-1.22‰）。这两个物种的 Δδ N 与胚胎总长度（L）之间存在显著的正线性关系。结果表明，胚胎的 Δδ N 取决于其生殖策略、分析的组织类型和胚胎 L。
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