title: Ecological status assessment of Skalenski Lakes (Bulgaria).
abstract: Over the past decade new ecological indices based on phytoplankton and macrophytes were developed as part of the tools for assessment of the ecological status of water bodies. This study demonstrates the applicability of two of them (Assemblage index /Q/ and Algae Group Index /AGI/) for evaluation of water bodies from a lake type L4 as well as their comparability. Assessment of the ecological status of two lake ecosystems was performed in order to ensure successful protection, enhancement and management of lowland and semi-mountain lakes in Bulgaria. Data on the aquatic flora from Golyamo Skalensko Lake and Malko Skalensko Lake over a period of two years were used to assess their ecological status. In addition, the toxic potential of the established dominant cyanoprokaryotic species was also evaluated. Phytoplankton- and macrophyte-based metrics resulted in complementary evaluation of temporary and long-term environmental conditions. Despite the hydraulic connection and proximity between the two lakes, Golyamo Skalensko Lake and Malko Skalensko Lake appear as completely different ecosystems, according to the phytoplankton structure (species composition, number of species, abundance, seasonal succession), macrophytes and ecological status.
authors.affiliation: Department of Botany, Faculty of Biology, Plovdiv University "P. Hilendarski" , Plovdiv , Bulgaria.
authors.forename: Ivanka
authors.initials: I
authors.lastname: Teneva
authors.affiliation: Department of Botany, Faculty of Biology, Plovdiv University "P. Hilendarski" , Plovdiv , Bulgaria.
authors.forename: Gana
authors.initials: G
authors.lastname: Gecheva
authors.affiliation: Department of Botany, Faculty of Biology, Plovdiv University "P. Hilendarski" , Plovdiv , Bulgaria.
authors.forename: Svetoslav
authors.initials: S
authors.lastname: Cheshmedjiev
authors.affiliation: Department of Botany, Faculty of Biology, Plovdiv University "P. Hilendarski" , Plovdiv , Bulgaria.
authors.forename: Plamen
authors.initials: P
authors.lastname: Stoyanov
authors.affiliation: Department of Botany, Faculty of Biology, Plovdiv University "P. Hilendarski" , Plovdiv , Bulgaria.
authors.forename: Rumen
authors.initials: R
authors.lastname: Mladenov
authors.affiliation: Department of Botany, Faculty of Biology, Plovdiv University "P. Hilendarski" , Plovdiv , Bulgaria.
authors.forename: Detelina
authors.initials: D
authors.lastname: Belkinova
keywords: WFD; cyanotoxins; ecological assessment; functional groups; lakes; macrophytes; phytoplankton