Pb2+对衣藻和微囊藻种间竞争的影响

以衣藻和微囊藻的混合培养来模拟水体生态系统的浮游植物群落,研究了pb2 不同质量浓度对水体生态系统中衣藻和微囊藻种间竞争的影响.结果显示,其优势种随pb2 质量浓度的变化而变化,在乙酸铅低质量浓度下铜绿微囊藻为优势种,而在乙酸铅高质量浓度下衣藻变为优势种.测定了pb2 不同质量浓度对衣藻和微囊藻的生长、叶绿素a含量以及蛋白质的影响,结果表明:微囊藻在乙酸铅低质量浓度污染下生长速度较快,而衣藻对Pb2 高质量浓度污染的耐受能力较微囊藻高,这可能是导致衣藻和微囊藻混合培养的培养体系结构随环境Pb2 污染强度而变化的重要原因.

Effects of Pb2+on inter-specific competition of Microcystis aeruginosa and Chlamydomonas reinhaidtii

The interspecific competition between Microcystis aeruginosa and Chlamydomonas reinhaidtii under conditions of different Pb2+concentrations were studied to evaluate the effects of Pb2+ pollution on the phytoplanktonic community of fresh water ecosystem. The results showed that the dominant species altered in respond to different Pb2+ concentrations. The dominant species of the simulated community is Microcystis aeruginosa when the concentrations of Pb2+ are lower. But when the concentrations of Pb2+ are relatively high, Chlamydomonas reinhaidtii became the dominant species. The influence of different Pb2+ concentrations on the growth curve, chlorophyll a and proteins were also measured to reveal the mechanisms underlying this change. The results showed that the alternation of dominant species of the simulated ecosystem may be due to faster growth rate of Microcystis aeruginosa under lower Pb2+ concentrations and more resistant capacity of Chlamydomonas reinhaidtii to higher Pb2+ concentrations.