ABSTRACT1. The limnological characteristics of Salda Lake, a deep, soda and highly alkaline lake in the Lake District of southwestern Turkey, are presented.2. Physical and chemical variables indicate that the lake is composed of hydrochemically different water layers formed by groundwater sources located on the floor of the lake.3. Phytoplankton and zooplankton are characterized by a limited number of species and low dominance reflecting the extreme conditions of the lake.4. Hydromagnesite stromatolites occur all around the lake margins. 5. The lake is threatened by falling water levels and organic pollution. Recommendations for the conservation of the lake are presented.
Limnological characteristics of Lake Burdur in Lake District in south‐western Turkey are presented. It is a deep, tectonic (estimated max. depth 100 m), athalassic, highly alkaline, and saline lake. A set of physical and chemical variables was monitored, phyto‐ and zooplankton was sampled from surface layer of the lake during 1997. Physico‐chemical variables indicated that the lake is hyposaline and composed of some hydrochemically different water layers formed by groundwater sources located on the bottom of the lake. The phytoplankton composition of Lake Burdur consisted of Cyanophyta, Chlorophyta, Bacillariophyta, Dinophyta, and Chrysophyta. The abundance and number of species of Chlorophyta and Cyanophyta were higher than the other taxa. The zooplankton composition of the Lake consisted of Rhizopoda, Rotifera, and Crustacea. Number of species of Rotifera was higher than the other taxa. The diversities of the phyto‐ and zooplankton were calculated according to the Shannon‐Weaver diversity index. The diversity of each group was found to be low in the lake.
The Hirudinea species were collected from various running waters and lakes in Turkey. The sampling sites were located on Yeşilırmak River, streams in Yedigöller National Park, Büyük Menderes River, Lake Beyşehir, Lake Işıklı, Karamuk Marsh and Karadut Spring of Acıgöl Lake. Recorded species were evaluated with physicochemical variables such as temperature, pH, dissolved oxygen, conductivity, nitrite nitrogen, nitrate nitrogen, ammonium nitrogen, orthophosphate phosphorus and substratum structure. In this study, eight Hirudinea species were determined. These are Helobdella stagnalis, Erpobdella octoculata, Erpobdella testacea, Erpobdella vilnensis, Dina stschegolewi, Hirudo verbana, Limnatis nilotica, Haemopis sanguisuga. The relationships between leech species and water quality variables were assessed with canonical correspondence analysis. The results show that leech species which are found in the present study are able to live in different saprobic levels in streams and trophic levels in lakes, but they usually prefer polluted environments. Knowledge of ecological characteristics of leech species must be improved to use them in water quality assessment much more effectively.
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