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首页> 外文期刊>Environmental toxicology and chemistry >COPPER-INDUCED MODIFICATIONS OF THE TROPHIC RELATIONS IN RIVERINE ALGAL-BACTERIAL BIOFILMS
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COPPER-INDUCED MODIFICATIONS OF THE TROPHIC RELATIONS IN RIVERINE ALGAL-BACTERIAL BIOFILMS

机译：铜诱导的河藻藻类细菌生物膜营养关系的铜修饰

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摘要

The effects of copper (Cu) on photosynthetic riverine biofilms were studied in artificial stream channels. Direct effects on the composition and functioning of the biofilms were investigated using plant pigments, community-level physiological profiles (CLPP), and pulse-amplitude-modulated (PAM) fluorescence. Copper caused a significant reduction of microalgal biomass and induced a shift in the population from diatoms to cyanobacteria. However, a decrease in biomass indicated that the replacement of species was not totally effective to counteract the toxic effects of Cu. A direct effect of Cu could also be shown in the bacterial community, and, furthermore, changes in the CLPP could be related to the Cu treatment. Copper-exposed biofilms lost the capacity to use between 11 and 15% of the substrates, but many of the remaining capacities became more robust, indicating an increased Cu tolerance due to the exposure. The change in the biofilm microbial composition points to the indirect effects of Cu on biofilms due to the close interdependence between biofilm autotrophic and heterotrophic compartments. Grazing by snails, which appeared to be an important factor structuring biofilms without any Cu addition, had a very minor effect on Cu-exposed biofilms. Although grazing changed the bacterial composition, its effects were not detected either on the algal community or on the biofilm community tolerance to Cu.
机译：在人工河道中研究了铜（Cu）对光合作用河生物膜的影响。使用植物色素，群落水平的生理概况（CLPP）和脉冲幅度调制（PAM）荧光研究了对生物膜组成和功能的直接影响。铜引起微藻生物量的显着减少，并导致种群从硅藻转移到蓝细菌。然而，生物量的减少表明物种的替代并不能完全有效地抵消铜的毒性作用。铜的直接作用也可能在细菌群落中显示出来，此外，CLPP的变化可能与铜的处理有关。暴露于铜的生物膜失去了在11％至15％的底物之间使用的能力，但是许多剩余的能力变得更加坚固，这表明由于暴露而导致的Cu耐受性提高。生物膜微生物组成的变化表明，由于生物膜自养区室和异养室之间的紧密相互依存关系，Cu对生物膜的间接作用。蜗牛吃草似乎是构成不添加任何铜的生物膜的重要因素，但对暴露于铜的生物膜的影响很小。尽管放牧改变了细菌的组成，但在藻类群落或生物膜群落对铜的耐受性上均未发现其作用。

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