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Effects of trophic ecology and habitat use on maternal transfer of contaminants in four species of young of the year lamniform sharks |
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| Institution: | 1. California State University Long Beach, Long Beach, CA, USA;2. Hopkins Marine Station, Stanford University, Pacific Grove, CA, USA;3. National Marine Fisheries Service, Southwest Fisheries Science Center, La Jolla, CA, USA;4. Simon Fraser University, Burnaby, BC, Canada;5. Monterey Bay Aquarium, Monterey, CA, USA;6. Southern California Marine Institute, Terminal Island, CA, USA |
| Abstract: | Organic contaminant and total mercury concentrations were compared in four species of lamniform sharks over several age classes to examine bioaccumulation patterns and gain insights into trophic ecology. Contaminants found in young of the year (YOY) sharks were assumed to be derived from maternal sources and used as a proxy to investigate factors that influence maternal offloading processes. YOY white (Carcharodon carcharias) and mako (Isurus oxyrinchus) sharks had comparable and significantly higher concentrations of PCBs, DDTs, pesticides, and mercury than YOY thresher (Alopias vulpinus) or salmon (Lamna ditropis) sharks. A significant positive relationship was found between YOY contaminant loads and maternal trophic position, suggesting that trophic ecology is one factor that plays an important role in maternal offloading. Differences in organic contaminant signatures and contaminant concentration magnitudes among species corroborated what is known about species habitat use and may be used to provide insights into the feeding ecology of these animals. |
| Keywords: | Maternal offloading Elasmobranch Trophic ecology Bioaccumulation Organochlorine Metals PCBs"} {"#name":"keyword" "$":{"id":"kwrd0045"} "$$":[{"#name":"text" "_":"polychlorinated biphenyls DDT"} {"#name":"keyword" "$":{"id":"kwrd0055"} "$$":[{"#name":"text" "_":"dichlorodiphenyltrichloroethane 4 4′-DDE"} {"#name":"keyword" "$":{"id":"kwrd0065"} "$$":[{"#name":"text" "_":"dichlorodiphenyl dichloroethane ANOSIM"} {"#name":"keyword" "$":{"id":"kwrd0085"} "$$":[{"#name":"text" "_":"analysis of similarity SIMPER"} {"#name":"keyword" "$":{"id":"kwrd0095"} "$$":[{"#name":"text" "_":"similarity percentage analysis |
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