Faculty of Science, University of Technology Sydney, Ultimo, NSW, Australia; School of Chemistry, University of Wollongong, Wollongong, NSW, Australia; CSIRO Land and Water, Lucas Heights, NSW, Australia.
CSIRO Land and Water, Lucas Heights, NSW, Australia.
Environ Pollut. 2019 Sep;252(Pt B):1582-1592. doi: 10.1016/j.envpol.2019.06.003. Epub 2019 Jun 6.
Localised sites in Antarctica are contaminated with mixtures of metals, yet the risk this contamination poses to the marine ecosystem is not well characterised. Recent research showed that two Antarctic marine microalgae have antagonistic responses to a mixture of five common metals (Koppel et al., 2018a). However, the metal accumulating potential and risk to secondary consumers through dietary exposure are still unknown. This study investigates cellular accumulation following exposure to a mixture of cadmium, copper, nickel, lead, and zinc for the Antarctic marine microalgae, Phaeocystis antarctica and Cryothecomonas armigera. In both microalgae, cellular cadmium, copper, and lead concentrations increased with increasing exposures while cellular nickel and zinc did not. For both microalgae, copper in the metal mixture drives inhibition of growth rate with R values > -0.84 for all cellular fractions in both species and the observed antagonism was likely caused by zinc competition, having significantly positive partial regressions. Metal accumulation to P. antarctica and C. armigera is likely to be toxic to consumer organisms, with low exposure concentrations resulting in cellular concentrations of 500 and 1400 × 10 mol Zn cell and 160 and 320 × 10 mol Cu cell, respectively.
南极洲的局部地区受到金属混合物的污染，但这种污染对海洋生态系统构成的风险尚未得到充分描述。最近的研究表明，两种南极海洋微藻对五种常见金属的混合物表现出拮抗反应（Koppel 等人，2018a）。然而，通过饮食暴露，金属积累的潜力以及对二次消费者的风险仍然未知。本研究调查了在镉、铜、镍、铅和锌混合物暴露后，南极海洋微藻 P.antarctica 和 Cryothecomonas armigera 的细胞积累情况。在这两种微藻中，细胞内镉、铜和铅浓度随着暴露量的增加而增加，而镍和锌则没有。对于这两种微藻，金属混合物中的铜会抑制生长速率，所有细胞组分的 R 值均大于-0.84，并且观察到的拮抗作用可能是由于锌的竞争，具有显著的正偏回归。P.antarctica 和 C.armigera 对金属的积累可能对消费者生物有毒，低浓度的暴露会导致细胞内浓度分别达到 500 和 1400×10mol Zn 细胞和 160 和 320×10mol Cu 细胞。
