Agricultural Science and Technology

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Browsing Agricultural Science and Technology by Author "Borgå, Katrine"

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    Seasonal Rainfall Affects Occurrence of Organohalogen Contaminants in Tropical Marine Fishes and Prawns from Zanzibar, Tanzania
    (ELSEVIER, 2021) Haarra, Ane; Mwakalapa, Eliezer B.; Mmochi, Aviti J.; Lyche, Jan L; Ruuse, Anders; Othman, Halima; Larsen, Martin M.; Borgå, Katrine
    Seasonal differences in precipitation may affect contaminant dynamics in tropical coastal regions due to terrestrial runoff of contaminants to the marine environment after the rainy seasons. To assess the effect of seasonal rainfall on occurrence of organohalogen contaminants in a coastal ecosystem, marine fishes and prawns were collected off the coast of Zanzibar, Tanzania in January and August 2018, representing pre- and post-rainy season, respectively. Samples were analyzed for organochlorine pesticides (OCPs), polychlorinated biphenyls(PCBs),brominatedflameretardants(BFRs),includingpolybrominateddiphenyl ethers (PBDEs) and emerging BFRs, as well as the dietary descriptors stable isotopes of carbon (δ13C) and nitrogen (δ15N). Across all species and seasons, mean contaminant concentrations ranged frombelowlimitofdetection(LOD)to129ng/glipidweight(lw)ΣPCBs;5.6–336ng/glwΣOCPs;and increaseinlowerhalogenated,moremobilePCBandPBDEcongeners,comparedtohigherhalogenatedcon geners with lower mobility, between January and Augustaligns with a signal and effect of terrestrial runoff followingtherainyseason