摘要：Planktic diatom ecology in the mountain lakes of the northern European Alps has only been studied
sparsely so far. To fill this knowledge gap, the driving parameters of planktic diatom assemblage
composition in the euphotic zones of twenty lakes located between 955 and 2,060 m a.s.l. were
assessed. The mean August water temperature, concentration of major ions, total phosphorous, and
lake physical parameters explained significant amounts of variation within the diatom assemblages, as
identified by redundancy analysis and consecutive backward selection. Cyclotella comensis was the most
abundant taxon in these oligotrophic (<17 total phosphorus µg/L), phosphorous (P) limited, stratified
study lakes, particularly when the calcium concentration was high (>35 mg/L). The results of generalized
linear models and generalized additive models further revealed that August surface temperature,
thermocline depth, and nitrate-N positively and significantly influenced C. comensis growth. These
results shed light on the interplay between physical and chemical parameters as important drivers of
C. comensis abundance in temperate mountain lakes. They may aid in the interpretation of past and the
prediction of future climate-driven changes in planktic diatom composition in these lakes.
关键词：Cyclotella comensis;
mountain lakes; lake water
temperature; phytoplankton
