Seasonal dynamics of plankton in a mountain lake in the southern Alps (Laghetto Inferiore, Switzerland)
AbstractThe pelagic populations in Laghetto Inferiore (southern Swiss Alps) were studied between 1996 and 1998 during the ice-free period. Investigations revealed a considerable number of phytoplankton species but few zooplankton species. The vertical distribution of the main species of algae shows a marked vertical stratification, with higher biomass concentrations in the deep zone. Along this profile, species in the same taxonomic class tend to be distributed at different depths, according to their specific light requirements. During the study period no clear seasonal succession of populations was observed, also because of the influence of precipitation on the biological cycles. On the whole there was a good correspondence between the biomass values of phytoplankton and those of chlorophyll-a, both in integral samples of the whole water column and in the vertical profile.
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Copyright (c) 1999 Marco SIMONA, Alberto BARBIERI, Mauro VERONESI, Stefano MALUSARDI, Viera STRAŠKRABOVÁ
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