title: Bioaccumulation and toxic potencies of polychlorinated biphenyls and polycyclic aromatic hydrocarbons in tidal flat and coastal ecosystems of the Ariake Sea, Japan.
abstract: Sediment and marine biota comprising several species of tidal flat and coastal organisms were analyzed for polychlorinated biphenyls (PCBs) including non- and mono-ortho coplanar congeners and polycyclic aromatic hydrocarbons (PAHs) to examine bioaccumulation profiles and toxic potencies of these contaminants. Concentrations of PCBs in tidal flat organisms ranged from 3.6 ng/g (wet wt) in clams to 68 ng/g (wet wt) in omnivore tidal flatfishes, a discernible trend reflecting concentrations and trophic levels. In contrast, PAHs concentrations were the highest in lower trophic organisms, such as crabs and lugworms from tidal flat, whereas those in coastal fishes, squid, and finless porpoises were less than detection limit. Greater bioaccumulation of PAHs was found in lugworms and crabs, which might be due to their direct ingestion of sediment particulates absorbed with PAHs. TCDD toxic equivalents (TEQs) were calculated for PCBs and PAHs in sediments and biota. PCBs accounted for a greater proportion of total TEQs (sum(TEQs): sum of TEQ(PCB) and TEQ(PAH)) in coastal and tidal flatfishes (>95%), while PAHs occupied a considerable portion of sum(TEQs) in sediment (>97%). Interestingly, TEQ(PAH) accounted for 37% and 81% of the sum(TEQs) in crabs and clams, respectively. Benzo[b]fluoranthene was the dominant contributor to TEQ(PAH) in both the species. Considering these observations, the environmental risks of PAHs may not be ignored in benthic tidal flat organisms due to their greater bioaccumulation through sediments.
authors.affiliation: Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan. nakata@sci.kumamoto-u.ac.jp
authors.forename: Haruhiko
authors.initials: H
authors.lastname: Nakata
authors.forename: Yasufumi
authors.initials: Y
authors.lastname: Sakai
authors.forename: Takashi
authors.initials: T
authors.lastname: Miyawaki
authors.forename: Akira
authors.initials: A
authors.lastname: Takemura
mesh_terms: D000818:Animals; D049872:Bivalvia / Q000737:chemistry; D003386:Brachyura; D049832:Decapodiformes; D004784:Environmental Monitoring; D004785:Environmental Pollutants / Q000032:analysis / Q000493:pharmacokinetics* / Q000633:toxicity*; D005399:Fishes; D020387:Food Chain; D019015:Geologic Sediments / Q000737:chemistry*; D007564:Japan; D009835:Oligochaeta; D011078:Polychlorinated Biphenyls / Q000032:analysis / Q000493:pharmacokinetics* / Q000633:toxicity*; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis / Q000493:pharmacokinetics* / Q000633:toxicity*; D019576:Porpoises; D018570:Risk Assessment; D014018:Tissue Distribution
chemical_list: D004785:Environmental Pollutants; D011084:Polycyclic Aromatic Hydrocarbons; D011078:Polychlorinated Biphenyls