title: Mother-offspring isotope fractionation in two species of placentatrophic sharks.
abstract: Stable-isotope values of a scalloped hammerhead Sphyrna lewini and blacktip shark Carcharhinus limbatus and their respective embryos were analysed. Embryos of both species were enriched in δ(15) N compared to their mothers (0·82 and 0·88‰, respectively), but fractionation of δ(13) C varied. Embryonic S. lewini were enriched (1·00‰) in δ(13) C while C. limbatus were depleted (0·27‰) relative to their mothers.
authors.affiliation: Marine Science Program, Department of Biological Sciences, Florida International University, North Miami, FL 33181, USA. jeremy.vaudo@fiu.edu
authors.forename: J J
authors.initials: JJ
authors.lastname: Vaudo
authors.forename: P
authors.initials: P
authors.lastname: Matich
authors.forename: M R
authors.initials: MR
authors.lastname: Heithaus
mesh_terms: D000818:Animals; D002247:Carbon Isotopes / Q000032:analysis / Q000378:metabolism*; D004625:Embryo, Nonmammalian / Q000737:chemistry; D005260:Female; D009587:Nitrogen Isotopes / Q000032:analysis / Q000378:metabolism*; D012754:Sharks / Q000378:metabolism / Q000502:physiology*
chemical_list: D002247:Carbon Isotopes; D009587:Nitrogen Isotopes