MELEK ZEYBEK, Hasan KALYONCU, Ömer Osman ERTAN

Species composition and distribution of mollusca in relation to water quality

Uluslararası kriterlere göre A sınıfı sulak alan olarak kabul edilen Eğirdir Gölü, bir regülatör ve kanal sistemi ile Kovada Gölüne bağlanır. Kovada Gölü, Türkiyenin önemli doğa koruma alanlarından biridir. Temmuz 2010-Haziran 2011 tarihleri arasında gerçekleştirilen bu çalışmada, Eğirdir ve Kovada Gölleri ile Kovada kanalının su kalitesi fizikokimyasal parametreler kullanılarak belirlenmiş, su kalitesini belirlemede Molluskların kullanılabilirliği araştırılmıştır. Ayrıca bu canlıların ekolojik özellikleri, dağılım ve çeşitlilikleri incelenmiştir. Çalışma sonunda 11i Gastropoda ve 2si Bivalvia sınıflarına ait olmak üzere 11 takson tespit edilmiştir. Radix auricularia E1 istasyonunda; Theodoxus heldreichi heldreichi, Falsipyrgula pfeiferi, Radix labiata, Planorbis planorbis ve Hippeutis complanatus E2 istasyonunda; Gyraulus albus K1 istasyonunda; Physella acuta K2 istasyonunda; Bithynia pseudemmericia ve Graecoanatolica lacustristurca E3 istasyonunda; Borysthenia naticina C3, Pisidium casertanum ise C2 istasyonunda en yüksek baskınlığına ulaşmıştır. Fizikokimyasal parametrelere göre 3 farklı su kalitesi sınıfı belirlenmiş, Eğirdir Gölü (E1, E2, E3) kirlenmemiş, Kovada kanalı (C1, C2, C3) orta derecede kirlenmiş, Kovada Gölü (K1, K2, K3) ise az kirlenmiş olarak tespit edilmiştir. Çevresel faktörler ile canlılar arasındaki ilişki Pearson korelasyon indeksi kullanılarak belirlenmiştir. Analiz sonuçları, bireylerin toplam sayısı ile bazı çevresel faktörler (çözünmüş oksijen, pH, toplam sertlik, anyonlar ve katyonlar gibi) arasında önemli korelasyon olduğunu göstermiştir. Ayrıca çalışmada tespit edilen Hippeutis complanatus Eğirdir Gölü için yeni kayıt niteliğindedir.

Mollusca türlerinin su kalitesine bağlı olarak dağılımı ve kompozisyonu

Lake Eğirdir is an A class wetland according to international criteria and in terms of the protection of biological diversity. The lake connects to Lake Kovada via a regulator and channel system. Lake Kovada is one of the important Nature Conservation Areas in Turkey. In this study, the possibility of using Mollusca for assessment of water quality in lakes Eğirdir and Kovada, study-area water quality according to physico-chemical parameters, variety and distribution of Mollusca, and ecological aspects were investigated from July 2010 to June 2011. Mollusk fauna in the working field was represented by 11 taxa of Gastropoda and 2 taxa of Bivalvia. Radix auricularia at E1 station; Theodoxus heldreichi heldreichi, Falsipyrgula pfeiferi, Radix labiata, Planorbis planorbis and Hippeutis complanatus at E2 station; Gyraulus albus at K1 station; Physella acuta at K2 station; Bithynia pseudemmericia and Graecoanatolica lacustristurca at E3 station; Borysthenia naticina at C3 station and Pisidium casertanum at C2 station reached to the highest dominance. Water quality was determined using by physicochemical parameters. Three different classes of water quality were determined. Based on the assessments, the stations on Lake Eğirdir (E1, E2, E3) were unpolluted, those on Kovada channel (C1, C2, C3) moderately polluted, while those on Lake Kovada (K1, K2, K3) slightly polluted. The relationships between the total number of individuals and environmental measurements were determined by Pearson correlation index. The results of analysis suggest a significant correlation between the total number of individuals and some environmental measurements such as dissolved oxygen, pH, total hardness, anions and cations. Additionally, Hippeutis complanatus was firstly recorded from the Lake Eğirdir.

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