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Exuviaella cordata red tide in Bulgarian coastal waters (May to June 1986)

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Abstract

The structure and some functional characteristics of the plankton community at the time of aExuviaella cordata red tide were investigated in Burgas Bay, Bulgaria, in May and June 1986. Characteristics of main plankton components (phyto-, bacterio-, nanoheterotrophic plankton, ciliates and mesoplankton) in the bloom area are presented. Development of theE. cordata bloom was determined by abiotic conditions among which eutrophication and salinity decrease caused the patchy character of its rapid development. Attainment of maximum red tide (ca. 1x109 cells l-1; 1x103 g m-3) from background (500 to 800x103 cells l-1; 600 mg m-3) took 3 to 7d. Growth rate (μ) during that period was 1.2 to 2.2 doublings per day. A sharp bloom decline (3 to 4d) was caused by parasitic flagellates destroying the alga's chloroplast. Diel biomass losses due to grazing remained below 5%. Metabolites and degradation products ofE. cordata revealed no pronounced toxic effects on the other components of the planktonic community. The rapid bloom degradation due to the effects of parasitic flagellates indicates the high potential of ecosystem “self-regulation”.

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Communicated by M. E. Vinogradov, Moscow

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Sukhanova, I.N., Flint, M.V., Hibaum, G. et al. Exuviaella cordata red tide in Bulgarian coastal waters (May to June 1986). Mar. Biol. 99, 1–8 (1988). https://doi.org/10.1007/BF00644971

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Keywords

  • Biomass
  • Growth Rate
  • Toxic Effect
  • Degradation Product
  • Coastal Water