Factors affecting annual occurrence, bioaccumulation, and biomagnification of polycyclic aromatic hydrocarbons in plankton food webs of subtropical eutrophic lakes.
Factors affecting annual occurrence, bioaccumulation, and biomagnification of polycyclic aromatic hydrocarbons in plankton food webs of subtropical eutrophic lakes.
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DOI：
10.1016/j.watres.2017.12.053
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发表时间：
2018-04
期刊：
影响因子：
12.8
通讯作者：
Yuqiang Tao;Jing Yu;Xing-qiang Liu;B. Xue;Su-min Wang
中科院分区：
文献类型：
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作者：
Yuqiang Tao;Jing Yu;Xing-qiang Liu;B. Xue;Su-min Wang
生物泵在温、寒贫营养沃茨中疏水性有机污染物的发生和归宿中起着至关重要的作用。然而，在亚热带富营养化沃茨中，HOCs长期发生和归宿的因素仍然很大程度上是未知的。本研究通过对中国亚热带富营养化湖泊浮游生物食物网中16种多环芳烃（PAHs）的5个分室进行为期1年的同步现场观测，揭示了影响PAHs在浮游生物食物网中的年发生率、生物累积和生物放大作用的生态地球化学和物理因素。结果表明，各湖泊水体中PAHs 16的年平均浓度范围为359.69 ± 31.52 ng L− 1 ~ 682.69 ± 65.41 ng L−1，随湖泊营养状态指数和浮游植物生物量的增加而增加，但与湖泊与城市的距离无关。浮游植物和浮游动物体内多环芳烃的分布受生物溶解作用的影响。与以往的研究相比，在贫营养沃茨中，不仅生物泵，但也平衡分配和富营养化的间接影响（高pH值诱导的浮游植物，浮游植物的生命周期）调制这些富营养化湖泊水体中的多环芳烃的年发生率。浮游生物对多环芳烃的生物富集因子与温度呈双相相关（n = 97-136，R2= 0.06- 0.24，p ≤ 0.008），并与浮游生物的物候有关。浮游生物对PAHs的生物富集系数取决于PAHs的疏水性（n = 16，R2= 0.27- 0.31，p ≤ .023），并随浮游生物量的增加而减小（n = 94-103，R2= 0.09- 0.27，p ≤ .010）。多环芳烃从浮游植物向浮游动物的营养转移随浮游植物生物量（n = 26，R2= 0.27，p = 0.004）和温度（n = 102-135，R2= 0.06- 0.13，p ≤ 0.004）的增加而增加，但随湖泊营养状态指数的增加而减少。生物放大作用只发生在浮游植物水华期间。
The biological pump plays a critical role in the occurrence and fate of hydrophobic organic contaminants (HOCs) mostly in temperate and frigid oligotrophic waters. However, the factors for the long-term occurrence and fate of HOCs in subtropical eutrophic waters remain largely unknown. This study provides novel insights into biogeochemical and physical factors on the annual occurrence, bioaccumulation, and biomagnification of 16 polycyclic aromatic hydrocarbons (PAHs) in the plankton food webs of four Chinese subtropical eutrophic lakes by one-year simultaneous field observations for five compartments. The annual mean ΣPAH16in the water columns ranged from 359.69 ± 31.52 ng L−1to 682.69 ± 65.41 ng L−1, and increased with the annual mean trophic state index, and phytoplankton biomass of these lakes, but was independent on the proximity of the lakes to urban areas. Biodilution effect played an important role in the occurrence of the PAHs in both phytoplankton and zooplankton. In contrast to previous studies in oligotrophic waters, not only the biological pump but also the equilibrium partitioning and the indirect influence of eutrophication (high pH induced by phytoplankton, and phytoplankton life cycling) modulated the annual occurrence of the PAHs in the water columns of these eutrophic lakes. Biphasic correlations were found between the bioaccumulation factors of the PAHs by plankton and the temperature (n = 97–136, R2= 0.06–0.24,p≤ .008), and were related to plankton phenology. Bioaccumulation factors by plankton were dependent on the hydrophobicity of the PAHs (n = 16, R2= 0.27–0.31,p≤ .023), and decreased with plankton biomass (n = 94–103, R2= 0.09–0.27,p≤ .010). Trophic transfer of the PAHs from phytoplankton to zooplankton increased with phytoplankton biomass (n = 26, R2= 0.27,p= .004), and the temperature (n = 102–135, R2= 0.06–0.13,p≤ .004), but decreased with lake trophic state index. Biomagnification only occurred during phytoplankton bloom periods.