The level and bioaccumulation of Cd, Cu, Cr and Zn in benthopelagic species from the Bering Sea
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The level and bioaccumulation of Cd, Cu, Cr and Zn in benthopelagic species from the Bering Sea SHI Ronggui1, 2, LIN Jing1, 3, YE Yi1, MA Yifan1, CAI Minggang1, 4* 1 College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China 2 South China Sea Environmental Monitor Center, State Ocean Administration, Guangzhou 501300, China 3 Third Institution of Oceanography, State Oceanic Administration, Xiamen 361005, China 4 State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China
Received 30 May 2014; accepted 11 September 2014 ©The Chinese Society of Oceanography and Springer-Verlag Berlin Heidelberg 2015
Abstract
The Bering Sea is an area of high biological productivity, with large populations of sea-birds, demersal and pelagic fishes, so it seemed desirable to assess the bioaccumulation of trace metals in the marine organisms from this area. However, few data on trace metal concentrations are available for the benthopelagic organisms from the Bering Sea till now. Ten specimens of benthos (including 120 biological samples) were collected in the western Bering Sea in August 2008 during the 3rd Chinese National Arctic Research Expeditions, and the concentration of Cd, Cu, Cr and Zn determined using atomic absorption spectrometry. Zn, Cr and Cd concentrations in muscle tissues of the crab species were much higher than those from fish and cephalopod species, and the highest concentration of Cu was observed in the muscle tissues of Cylichna nucleoli. The results showed a similar hierarchy for Zn, Cr, Cd and Cu concentrations among different tissues as follows: hepatopancreas>muscle tissue>gonad. Bioconcentration factors indicated that benthic organisms had high accumulation abilities for Zn and Cu. Key words: trace metal, benthopelagic species, bioconcentration, Bering Sea, Arctic Citation: Shi Ronggui, Lin Jing, Ye Yi, Ma Yifan, Cai Minggang. 2015. The level and bioaccumulation of Cd, Cu, Cr and Zn in benthopelagic species from the Bering. Acta Oceanologica Sinica, 34(6): 21–25, doi: 10.1007/s13131-015-0683-y
1 Introduction Because of their toxicity, nonbiodegradability and bioaccumulation capacity in the marine environment, heavy metals are always regarded as one of the most severe pollutants (Sinex and Wright, 1988; Dragun et al., 2010). Some metals, such as copper, zinc, iron, and manganese, are essential metals for aquatic organisms at a low concentration, while if their concentrations are increased above the natural baseline level, they may become toxic for marine organisms (Sandor et al., 2001; Tüzen, 2003; Busuioc et al., 2011). On the other hand, some other metals, such as cadmium, lead and mercury, which are not essential for organisms, have toxic effects (Lai et al., 2008; Anim et al., 2011). Because of their obvious bioaccumulation, once discharged into the marine environment, these metals tend to be accumulated in sediments and marine organisms and subsequently transferred along the food chain, which may finally influence the local marine ecosystem and the heal
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