Four Chara lakes, differing in their morphological features, physico-chemical water properties, catchment area characteristics and human pressure, were studied in order to recognize the influence of the charophyte PVI, proportion in the phytolittoral zone and species composition on phytoflagellate community. In one lake, the proportion of vegetation was lower than 50 % of the lake’s area while in the other lakes it was higher, in one of them reaching almost 70 %. Phytoflagellate diversity, biomass and relative biomass (proportion in total phytoplankton biomass) were studied monthly during the growing season. Both small and shallow as well as large and deep Chara lakes supported high proportion of phytoflagellates exceeding even 90 % of the total phytoplankton biomass, but our results suggest lake-specificity in the composition of phytoflagellates. Phytoflagellate species appeared among the phytoplankton dominants in each month and in each lake. Out of four phytoflagellate groups examined, the biomass of cryptophytes and relative biomass of haptophytes differed significantly in the Chara lakes studied. Cryptophytes were related to the human pressure on one hand and to the cover of charophyte vegetation on the other hand. The use and type of catchment area seem to be the main factors influencing the biomass and the structure of phytoflagellate assemblage.

研究了四个Chara湖泊，这些湖泊的形态特征，理化水特性，集水区特征和人类压力各不相同，以便认识到Charophyte PVI，在植物沿海区域的比例和物种组成对植物鞭毛虫群落的影响。在一个湖泊中，植被比例低于湖泊面积的50％，而在其他湖泊中，植被比例更高，其中一个湖泊的比例几乎达到70％。在生长季节每月对植物鞭毛藻的多样性，生物量和相对生物量（在浮游植物总生物量中的比例）进行研究。小号和浅号以及大号和深号Chara湖泊支持的鞭毛藻比例很高，甚至超过浮游植物总生物量的90％，但是我们的结果表明，在鞭毛藻的组成中湖泊具有特异性。在每个月和每个湖泊的浮游植物优势物种中都出现了鞭毛藻物种。在所研究的四个鞭毛藻类群中，在所研究的Chara湖泊中，隐生植物的生物量和触手植物的相对生物量显着不同。隐生植物一方面与人类的压力有关，另一方面与纸藻植物的植被有关。集水区的用途和类型似乎是影响植物鞭毛组合生物量和结构的主要因素。