Our results of estimated extracellular enzymatic
activities showed that the hydrolysis activity increased
in June as well as in October in the following order: β-
D-glucosidase < alkaline phosphatase < acetat
esterase, which complies with the results of Mudryk
and Skórczewski (Mudryk and Skórczewski, 2004)
regarding lake water ecosystems. According to
Münster et al. (Münster and de Haan, 1998), among
the most important microbial extracellular enzymes in
surface waters are glucosidases and phosphatases,