Department of Biology, University of Victoria, Victoria, British Columbia, Canada.
Department of Geography, University of Victoria, Victoria, British Columbia, Canada.
J Fish Biol. 2020 Apr;96(4):1060-1064. doi: 10.1111/jfb.14294. Epub 2020 Mar 2.
Stable nitrogen (δ N) and carbon (δ C) isotope ratios from muscle, liver and yolk were analysed from the mother and embryos of an ovoviviparous shark, Hexanchus griseus. Embryonic liver and muscle had similar δ N and δ C ratios or were depleted in heavy isotopes, compared to the same maternal somatic and reproductive yolk tissues, but no relationship existed between δ N or δ C and embryo length, as expected, because a switch to placental nourishment is lacking in this species. This study expands the understanding of maternal nourishment and embryonic stable isotope differences in ovoviviparous sharks.
从胎鲨（Hexanchus griseus）的母体和胚胎中分析了肌肉、肝脏和卵黄中的稳定氮（δ N）和碳（δ C）同位素比值。与母体的体组织和生殖卵黄组织相比，胚胎的肝脏和肌肉具有相似的δ N 和 δ C 比值，或者贫化了重同位素，但正如预期的那样，δ N 或 δ C 与胚胎长度之间没有关系，因为这种物种缺乏向胎盘营养的转变。本研究扩展了对胎鲨母体营养和胚胎稳定同位素差异的认识。
