Species diversity of rotifers (Rotifera: Eurotatoria) of Phu Ninh Lake with five new records from Vietnam

A total of sixty-one taxa of rotifer, belonging to 15 families, 3 orders were identified from the Phu Ninh Lake, Vietnam. Of these, five species were recorded new to Vietnam Rotifera fauna, including Lecane acanthinula (Hauer, 1938), L. sola (Hauer, 1936), L. thailandensis Segers & Sanoamuang, 1994, L. pyriformis (Daday, 1905), and Mytilina bisulcata (Lucks, 1912). The result raised the total number of rotifers known from Vietnam to 227 species. Moreover, the results showed that the number of species recorded increased with the increase of sample size, which followed the equation y=12.85+14.12log(x) (R2 = 0.99). Based on the estimators, the α-diversity of rotifers in Phu Ninh Lake might be up to 67±4 taxa (according to the Bootstrap index), 71±8 taxa (according to the Chao index), or even up to 79 taxa (according to Jacknife 2 index)

Isolation of Some Microalgae Strains Belonging to the Family Scenedesmaceas (Chlorophyta) in Freshwater Bodies in Central Vietnam and Investigation Into Their Biological Characteristics

Seven microalgae strains from samples collected from freshwater lakes in Central Vietnam were isolated and cultivated in BBM medium for investigating their biological characteristics and their applicability. These strains were identified belonging to 6 species, 3 genera of the family Scenedesmaceae, division Chlorophyta. Their average growth rate was from 0.081 - 0.160 d-1, and the highest cell density of each strain reached from 2.6 x 106 - 60 x 106 cells/ml. The total content of pigments (including chlorophyll-a, chlorophyll-b, and carotenoid) of all strains was not too high (4.10 - 11.3 μg/mL), but the total lipid content exhibiting noticeably high levels, accounted for 16.6% - 74.1% of dry cell weight. Among isolated strains, Desmodesmusabundans and D.costato-granulatus were the most prominent with the highest growth rate and density in combination with remarkably high contents of lipids and pigments, and thus were identified as two potentially great candidates for biofuel production and chlorophyll and carotenoid extraction