有毒铜绿微囊藻胁迫下三角帆蚌消化系统的扫描电镜观察

Scanning electron microscopy observation of Hyriopsis cumingii digestive system under toxic Microcystis aeruginosa exposure

通过观察暴露于不同浓度有毒铜绿微囊藻(Microcystis aeruginosa)下的三角帆蚌(Hyriopsis cumingii)的胃、前肠、中肠以及晶杆体等消化系统的扫描电镜切片,了解有毒铜绿微囊藻对三角帆蚌消化系统超显微结构的影响。结果显示,当三角帆蚌在浓度为1×107cell/L的有毒铜绿微囊藻环境下,其晶杆体随时间推移而逐渐溶解。在低浓度的铜绿微囊藻环境下,尽管其会继续滤食,但有毒铜绿微囊藻会对其消化系统造成破坏,随着接触时间的增长,造成其肠道内绒毛、纤毛数量减少,长度降低,从而降低其消化效率,对其生长造成影响。

The ultrastructural changes in the digestive system such as stomach,foregut,midgut,and crystalline style of the Hyriopsis cumingii cultured in different concentrations of toxic Microcystis aeruginosa were observed during the whole experimental period. The results revealed that H. cumingii＇s crystal rod was dissolved due to starvation,when the concentration of microcystis was more than 1× 107 cell / L. Toxic M. eruginosa showed negative effects on the fluff and cilia of the intestine. The figures illustrated that fluff and cilia became fewer and less. Hereby,toxic M. eruginosa might decrease the digestive efficiency of H. cumingii＇ s and have negative effects on its growth.