Abstract
A study of diversity and compositional stability of phytoplankton communities during one vegetation period was carried out in small lakes in upper Bavaria. Shannon-Weaver diversity index was calculated on the base of number of individuals and on the base of biomass. On average, the diversity (annual mean) was highest in mesotrophic lakes. A comparison of three morphologically different (esp. exposure to wind, surface area and mean depth) lakes (Pelhamer See, Thalersee and Kautsee) sought to find out how the phytoplankton community structure reacts to events of intermediate disturbance, in terms of diversity-or biomass changes. Principal Component Analysis was used to measure the persistence of the phytoplankton association. The examples given in this paper led to these conclusions: High diversity or increase in diversity occur in compositionally instable communities, in high wind-stress events, with small algae and with high grazing. Low diversity or decrease in diversity occur in compositionally stable periods, when conditions select few species, as large forms dominate and as grazing by zooplankton takes effect. Gradual seasonal changes are observed in structurally stable lakes. In lakes exposed to frequent disturbances, seasonal changes may be dominated by intermediate responses.
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Holzmann, R. (1993). Seasonal fluctuations in the diversity and compositional stability of phytoplankton communities in small lakes in upper Bavaria. In: Padisák, J., Reynolds, C.S., Sommer, U. (eds) Intermediate Disturbance Hypothesis in Phytoplankton Ecology. Developments in Hydrobiology, vol 81. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-1919-3_10
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DOI: https://doi.org/10.1007/978-94-017-1919-3_10
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