title: Radioisotopes demonstrate the contrasting bioaccumulation capacities of heavy metals in embryonic stages of cephalopod species.
abstract: Cephalopods play a key role in many marine trophic food webs and also constitute alternative fishery resources in the context of the ongoing decline in finfish stocks. Most coastal cephalopod species of commercial importance migrate into shallow waters during the breeding season to lay their eggs, and are consequently subjected to coastal contamination. Eggs of common cuttlefish Sepia officinalis, European squid Loligo vulgaris, common octopus Octopus vulgaris and the sepiolid Rossia macrosoma were exposed during embryonic development to dissolved (110m)Ag, (109)Cd, (60)Co, (54)Mn and (65)Zn in order to determine their metal accumulation efficiencies and distribution among different egg compartments. Cuttlefish eggs, in which hard shells enclose the embryos, showed the lowest concentration factor (CF) values despite a longer duration of exposure. In contrast, octopus eggs, which are only protected by the chorionic membrane, accumulated the most metal. Uptake appears to be linked to the selective retention properties of the egg envelopes with respect to each element. The study also demonstrated that the octopus embryo accumulated (110m)Ag directly from the dissolved phase and also indirectly through assimilation of the contaminated yolk. These results raise questions regarding the potential contrasting vulnerability of early life stages of cephalopods to the metallic contamination of coastal waters.
authors: International Atomic Energy Agency-Environment Laboratories, Monaco. tlacouel@gmail.com
authors: Thomas
authors: T
authors: Lacoue-Labarthe
authors: Roger
authors: R
authors: Villanueva
authors: Claude
authors: C
authors: Rouleau
authors: François
authors: F
authors: Oberhänsli
authors: Jean-Louis
authors: JL
authors: Teyssié
authors: Ross
authors: R
authors: Jeffree
authors: Paco
authors: P
authors: Bustamante
mesh_terms: D000818:Animals; D001345:Autoradiography; D001682:Biological Availability; D049830:Cephalopoda / Q000196:embryology* / Q000378:metabolism*; D004625:Embryo, Nonmammalian / Q000378:metabolism*; D019216:Metals, Heavy / Q000378:metabolism*; D009928:Organ Specificity; D011868:Radioisotopes / Q000378:metabolism*; D013045:Species Specificity
chemical_list: D019216:Metals, Heavy; D011868:Radioisotopes