Abstract
The present paper reports the results on the occurrence and composition of steady state phytoplankton assemblages in the shallow water bodies of 18 Bulgarian natural wetlands. They all differ in their morphometry, hydrology and trophic state. Steady states were identified according to Sommer & Padisák (1993) when (i) 1, 2 or 3 species of algae contribute more than 80% of total biomass, (ii) their existence or coexistence persists for long enough (more than 1–2 weeks) and (iii) during that period the total biomass does not increase significantly. These situations were rare and were dominated by 7 stress-tolerant, colony-forming and ruderal disturbance-tolerant cyanoprokaryotes (Microcystis aeruginosa, Microcystis wesenbergii, Anabaena spiroides,Anabaenopsis arnoldii, Aphanizomenon flos-aquae, Aphanizomenon gracile and Cylindrospermopsis raciborskii). The equilibrium states had been registered only during hypertrophic conditions in three stressed and frequently disturbed shallow water bodies and were related to the summer — late summer season.
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Stoyneva, M.P. (2003). Steady-state phytoplankton assemblages in shallow Bulgarian wetlands. In: Naselli-Flores, L., Padisák, J., Dokulil, M.T. (eds) Phytoplankton and Equilibrium Concept: The Ecology of Steady-State Assemblages. Developments in Hydrobiology, vol 172. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-2666-5_15
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