Trophic relations in two lakes from the Bulgarian Black Sea coast and possibilities for their restoration

Kalchev, Roumen; Pehlivanov, Luchezar; Beshkova, Michaela

doi:10.2166/wst.2002.0132

Cited by 2 publications

(1 citation statement)

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“…Many studies dealt with the survival and intensive development of filamentous and other types of large algal colonies (e.g. blue-green algae) and related them to their resistance to grazing (Benndorff et al 1988;Havens 1998;Kalchev et al 2002).…”

Section: Discussionmentioning

confidence: 99%

Ecological relations and temporal changes in the pelagial of the high mountain lakes in the Rila Mountains (Bulgaria)

Kalchev¹,

Botev²,

Hristozova³

et al. 2004

J Limnol

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The high mountain lakes in the Rila Mountains (Bulgaria) were studied in the years 2000 and 2001 considering the following groups of variables: geography, geology, morphology, hydrology, water chemistry of the pelagial, biomass and size structure of bacterio- phyto- and zooplankton, and occurrence of three fish species. Multivariate analysis (RDA) revealed that the nutrient concentrations in the lakes were significantly influenced by the soil percentage coverage of the catchment area. The explained variation in plankton components (bacterio-, phyto- and zooplankton) and plankton size structure was determined by biological as well as morphometrical and geographical variables. Changes in the Mg2+ and NO3-N concentrations were traced over the period 1993- 2001; the Ca2+ concentration, pH, nutrients, bacterio-, phyto- and zooplankton were monitored in the period 1995-2001. A nutrient decrease accompanied by an increase in size of zooplankton organisms in the period 1995-2001 led to a considerable increase of water transparency in the lakes

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Section: Discussionmentioning

confidence: 99%

Ecological relations and temporal changes in the pelagial of the high mountain lakes in the Rila Mountains (Bulgaria)

Kalchev¹,

Botev²,

Hristozova³

et al. 2004

J Limnol

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Phytoplankton Based Assessment of the Ecological Status and Ecological Potential of Lake Types in Bulgaria

Cheshmedjiev

Belkinova

Mladenov

et al. 2010

Biotechnology & Biotechnological Equipment

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Research has been carried out of the main characteristics of phytoplankton communities in order to assess the ecological status and ecological potential of the types of lakes in Bulgaria, according to the requirements of WFD 2000/60/EC. Eighty lakes/reservoirs have been researched on the territory of the Republic of Bulgaria. The assessment was made on the basis of four main metrics (phytoplankton biovolume; Algae Groups Index; transparency, chlorophyll a) and three additional metrics (% Cyanobacteria; intensity of algal "bloom" and presence of toxic species). More than half of the researched lakes in Bulgaria are in compliance with the WFD requirements for good ecological state (high and good ecological status, maximum and good potential ). A classification system for assessment of ecological status or potential has been developed using abovementioned phytoplankton metrics. The existing 17 types of lake in Bulgaria are classified in two main groups: oligotrophic lake types and mesotrophic lake types.

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Trophic relations in two lakes from the Bulgarian Black Sea coast and possibilities for their restoration

Cited by 2 publications

References 0 publications

Ecological relations and temporal changes in the pelagial of the high mountain lakes in the Rila Mountains (Bulgaria)

Ecological relations and temporal changes in the pelagial of the high mountain lakes in the Rila Mountains (Bulgaria)

Phytoplankton Based Assessment of the Ecological Status and Ecological Potential of Lake Types in Bulgaria

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