ABSTRACT

Information on the distribution and species composition of charophytes in Myanmar is scarce. Only a few studies on charophytes in ponds were conducted in Myanmar at the end of the nineteenth and first half of the twentieth century and lake habitats were not included in these studies. To increase the knowledge, we investigated Chara spp. from seven Myanmar lakes and reservoirs. In a polyphasic approach using morphological traits and DNA barcoding the specimens found were classified as Chara zeylanica and Chara fibrosa. Chara zeylanica is the most common of the two species found in Myanmar and was observed in five lakes, while Chara fibrosa was only found in three lakes. Chara zeylanica seems to prefer calcareous lakes while C. fibrosa was found in both highly and moderate alkaline lakes. Both species were recorded in low-impacted lakes only, with total phosphorous (TP) concentrations below 20 µg L⁻¹. Increased human impact on freshwater habitats must therefore be considered as a factor reducing Chara biodiversity in Myanmar.

抽象的

缅甸缺乏关于佛手藻的分布和种类组成的信息。在20世纪19年代末和上半叶，缅甸仅对池塘中的佛手藻进行了少量研究，这些研究未包括湖泊栖息地。为了增加知识，我们调查了Chara spp。来自七个缅甸湖泊和水库。在使用形态特征和DNA条形码的多相方法中，发现的标本被分类为Chara zeylanica和Chara fibrosa。Zea zeylanica是在缅甸发现的两个物种中最常见的物种，在五个湖泊中被观察到，而Chara fibrosa仅在三个湖泊中被发现。玉米似乎更喜欢钙质湖泊，而在高度和中度碱性湖泊中都发现了纤毛梭菌。两种物种仅在低影响的湖泊中记录，总磷（TP）浓度低于20 µg L ^-1。因此，必须考虑增加人类对淡水生境的影响，这是减少缅甸Chara生物多样性的一个因素。