Mercury in neonatal and juvenile blacktip sharks (Carcharhinus limbatus). Part I: exposure assessment.
Reistad NA; Florida Gulf Coast University, 10501 FGCU Blvd. South., Fort Myers, FL, 33965, USA. .
Norris SB; Florida Gulf Coast University, 10501 FGCU Blvd. South., Fort Myers, FL, 33965, USA.
Rumbold DG; Florida Gulf Coast University, 10501 FGCU Blvd. South., Fort Myers, FL, 33965, USA.
Ecotoxicology (London, England) [Ecotoxicology] 2021 Mar; Vol. 30 (2), pp. 187-197. Date of Electronic Publication: 2021 Jan 08.
Typ publikacji :
Imprint Name(s) :
Publication: 1999- : Boston : Kluwer Academic Publishers
Original Publication: London : Chapman & Hall,
MeSH Terms :
Animals ; Estuaries ; Florida ; Humans ; Infant, Newborn ; Muscles/chemistry
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Contributed Indexing :
Keywords: Chondrichthyes; Dietary exposure; Elasmobranch; Florida; Maternal offloading; Organs
Substance Nomenclature :
Entry Date(s) :
Date Created: 20210108 Date Completed: 20210427 Latest Revision: 20210427
Update Code :
Elasmobranchs are exposed to mercury (Hg) through a variety of pathways in the environment. This study assessed maternal offloading and diet-based Hg exposure for neonatal and juvenile blacktip sharks (Carcharhinus limbatus) from Charlotte Harbor located along southwest Florida's coast, a recognized Hg hotspot. Neonates (n = 57) had highest total Hg (THg) concentrations in the kidney (0.56 ± 0.26 mg kg -1 ; n = 38) and muscle (0.53 ± 0.17 mg kg -1 ; n = 57), followed by liver (0.31 ± 0.11 mg kg -1 ; n = 38), and blood (0.05 ± 0.033 mg kg -1 ; n = 57). Juveniles (n = 13) exhibited a different distribution with highest THg in the liver (0.868 ± 0.54 mg kg -1 ; n = 6), followed by the muscle (0.84 ± 0.28 mg kg -1 ; n = 13), kidney (0.55 ± 0.22 mg kg -1 ; n = 6), and blood (0.11 ± 0.04 mg kg -1 ; n = 11). The distribution of THg among tissues and liver-to-muscle ratios indicated that Hg originated primarily from maternal offloading in neonates, whereas juveniles continued to accumulate Hg through dietary exposure post-parturition. Additionally, comparisons between results of the present study and previous Florida blacktip shark surveys suggested that Hg levels have not declined in southwest Florida estuaries for over two decades.