鲍苗硅藻饵料培养池中的危害性纤毛虫及其优势种群研究

HARMFUL CILIATES AND DOMINANT POPULATION IN CULTURED PONDS OF ALGAE

应用纤毛虫的定性和定量方法 ,研究了规模化鲍苗硅藻饵料培养池中危害性纤毛虫的种类组成和各种类的种群变化过程。共观察到纤毛虫 33种 ,斯坦盾纤虫Aspidiscasteini和三齿盾纤虫Aspidiscatridentata为优势种。在藻类培养过程中 ,危害性纤毛虫种类数量呈先增加后减少 ,最多时有 2 5种。随着培养的藻类数量增加 ,纤毛虫数量也有所增加 ,在培养的第 1 3天达到数量的最大值。其最大总密度可达 2 1 2 8和 2 1 55个·cm- 2 。优势种斯坦盾纤虫和三齿盾纤虫最大密度达到 5 3— 7 2个·cm- 2 。此外 ,大突口虫Condylostomamagnum ,扇形游仆虫Euplotesvannus,具棘旋毛虫Dysteriaspinifera和双眉虫属Diophrys在数量上具有较高的比例。与藻类不同的是 。

With the methods of qualitative and quantitative analysis,the species composition and dominant population of harmful ciliates in algae cultured ponds were studied.Totally 33 species of ciliates,belonging to 3 classes,9 orders and 27 genus,were found.The dominant ciliate species were Aspidisca steini and Aspidisca tridentata. During the algal cultivation, the number of harmful ciliate species had shown a trend from fewer to more and then to fewer,the most were 25.The change trend of harmful ciliate densities in the ponds was similar to that of algae,and increased with the increase of algal density. The highest densities of ciliates were 21 28 and 21 55 cell·cm -2 respectively in two ponds,and then the densities decreased slowly. A.steini and A. tridentata had their densities of 5 3—7 2 cell·cm -2 at most.