OHRİD GÖLÜNDEKİ SU KALİTESİNİN DEĞERLENDİRMESİNDE DİATOME VE MAKROFİT ENDEKSLERİNİN KULLANILMASI.

Ecological evaluation of Ohrid Lake is based in biomonitoring, especially in epileptic diatoms and aquatic macrophytes correlated with organic pollution and nutrient enrichment. Ten sampling sites were selected in the Ohrid Lake of Albanian side. This study aimed comparing diatoms and macrophytes indexes as bioindicators of Lake water quality. All two organisms groups showed significant response to eutrophication organic or inorganic pollution gradients. Submerged macrophytes respond to changes in the nutrient concentrations in their environment. In contrast to diatoms e.g., submerged macrophytes are capable of taking up nutrients from sediment and overlying water. Individual species of diatoms have specific preference to habitat and requirement for water chemistry. In this study, more epiphytic and oligotrophic species (such as Cymbella spp., Gomphonema clevei, G. gracile etc.) were appeared while more euplanktonic meso and/or eutrophic species toward sediment surface. Diatoms and macrophytes therefore function as integrators of environmental conditions to which they are subjected and thus can be used as long-term indicators with high spatial resolution. The Shannon Index gave evidence of biodiversity variations over the seasons and some differences between sampling sites. The Saprobic Index oscillated within a small band, indicative for oligo-β-mesosaprob to β-mesosaprob conditions. The Trophic Diatom Index TIDIA, Macrophyte Index (MI) and the Saprobic Index (SI) follow similar trends. This indicates that the structures of the communities reflect real environmental changes. [ABSTRACT FROM AUTHOR]