Effects of photosynthetic bacteria strengthen on phyplankton community structure in intensive fish ponds
Effects of beneficial microorganism strengthen on phytoplankton community structure in intensive fish ponds were studied through adding photosynthetic bacteria into the fish ponds regularly. The results showed that main species were Chlorophyta and Bacillariophyta in the PSB strengthened (experimental) ponds, Synedra. sp, Melosira. sp were dominant species in early stages of aquaculture(May and early June), while Chlorococcus. sp, Scenedesmus. sp, Pediastrum. sp, Cyclotalia sp, Nietzsche sp were dominant species at middle and later culture stages( July to September). Water color was in good condition such as light green, brown. There were no significant difference on the phytoplankton community structure of both system in early period, However, significant changes appeared at middle and later culture stage in the control pond, Microcystis. sp, Oscillatoria. sp, Anabaena.sp, Phormidium. sp of Cyanophyta were dominant species. The biomass of algae in the experimental ponds was significantly lower than that in the control pond( P < 0. 05) and algae varied greatly in control pond. The proportion of the Cyanophyta increased to 77.6% , which was much higher than those in experimental ponds(less than 25.0% ). Besides, the Shannon-Wiener index and the Pielou evenness index of algae in the control pond were lower than those in experimental pond. It was concluded that photosynthetic bacteria maintained phytonplankton diversity in the ponds by effectively restricting the growth of Cyanophyta. It is promising to use photosynthetic bacteria to keep a stable phytonplankton in fish ponds.
photosynthetic bacteriaphytoplanktoncommunity structureintensive fish ponds
NETL
NSTL
万方数据
维普
