egejfas Ege Journal of Fisheries and Aquatic Sciences 2148-3140 Ege University 10.12714/egejfas.41.1.01 Hydrobiology Freshwater Ecology Conservation and Biodiversity Limnology Hidrobiyoloji Tatlı Su Ekolojisi Koruma ve Biyolojik Çeşitlilik Limnoloji Investigations on the zooplankton distribution and composition of Işıklı Lake (Çivril-Denizli/Türkiye), with a trophic status assessment Işıklı Gölü (Çivril-Denizli/Türkiye) zooplankton dağılımı ve kompozisyonunun trofik durum değerlendirmesi ile araştırılması https://orcid.org/0000-0002-2108-1853 Apaydın Yağcı Meral Bandırma Koyunculuk Araştırma Enstitüsü Müdürlüğü, Bandırma, Balıkesir https://orcid.org/0000-0002-7342-9380 Uysal Rahmi Tarım ve Orman Bakanlığı , Eğirdir İlçe Tarım Müdürlüğü. Eğirdir, Isparta https://orcid.org/0000-0002-7897-1734 Yağcı Abdulkadir Tarım ve Orman Bakanlığı Bandırma Koyunculuk Araştırma Enstitüsü Müdürlüğü https://orcid.org/0000-0001-5349-1497 Yegen Vedat Tarım ve Orman Bakanlığı Eğirdir Su Ürünleri Araştırma Enstitüsü Müdürlüğü. Eğirdir-Isparta 03 15 2024 41 1 1 7 09 15 2023 11 22 2023 Copyright © 1984, Ege Journal of Fisheries and Aquatic Sciences 1984 Ege Journal of Fisheries and Aquatic Sciences

In this study, the zooplankton distribution and composition of Işıklı Lake, located in the Inner West Anatolia region of Türkiye, were examined monthly between 2003-2005. Zooplankton samples were collected with Hydro-Bios plankton net (55 µm) at the surface and fixed in formaldehyde (4%). Physiological parameters such as surface water temperature, pH, dissolved oxygen, and conductivity were also measured. Also, the frequency index (F %) and the Brachionus / Trichocerca (QB/T) were determined to assess the trophic composition of Lake Işıklı. A total of 49 species have been identified. Rotifera (55%), Cladocera (27%) and Copepoda (18%) were represented by the species. The maximum species was found in May 2004 (21 species), while the minimum was found in October 2003 (5 species). Asplanchna priodonta, Keratella cochlearis, Keratella tecta, Polyarthra dolichoptera, Synchaeta pectinata, Bosmina longirostris and Chydorus sphaericus are common species in the lake. The water temperature varied between 3.9-24.6 °C; pH ranged from 8.1 to 8.8; the electrical conductivity ranged from 341 µS/cm to 434 µS/cm; the dissolved oxygen values changed from 5.8 mg/L to 11.1 mg/L. According to the frequency index (F %), the most dominant species are B. longirostris (74 %), K. cochlearis (62 %), A. priodonta (54 %), and C. sphaericus (51 %). A total of 20 species are reported for the first time from the region. Newly reported species from the lake were: the rotifers, A. priodonta, Brachionus angularis, Brachionus calyciflorus, Colurella colurus, Keratella quadrata, Lecane clostrocerca, Lecane ludwigi, Lecane luna, Lecane lunaris, Lecane ohioensis, Lecane quadridentata, Lecane sp., Mytilina mucronata, Notholca acuminata, Notholca squamula, Trichotria tetractis, the cladocerans Acroperus harpae, Daphnia cucullata, and the copepods Eucyclops macrurus and Megacyclops gigas. Considering the Brachionus / Trichocerca (QB/T) ratio according to the Sládeček (1983) index, the lake showed mesotrophic features.

Bu çalışmada Türkiye'nin İç Batı Anadolu bölgesinde yer alan Işıklı Gölü'nün zooplankton dağılımı ve kompozisyonu 2003-2005 yılları arasında aylık olarak incelenmiştir. Zooplankton örnekleri yüzeyden Hydro-Bios plankton ağı (55 µm) ile toplanmıştır ve formaldehit (% 4) içerisine sabitlenmiştir. Yüzey suyu sıcaklığı, pH, çözünmüş oksijen ve elektriksel iletkenlik gibi bazı fizikokimyasal parametreler de ölçülmüştür. Ayrıca Işıklı Gölü'nün trofik kompozisyonunu değerlendirmek amacıyla frekans indeksi (% F) ve Brachionus / Trichocerca (QB/T) belirlenmiştir. Toplam 49 tür tespit edilmiştir. Rotifera (%55), Cladocera (%27) ve Copepoda (%18) türleri tarafından temsil edilmiştir. Maksimum tür Mayıs 2004'te (21 tür), minimum tür ise Ekim 2003'te (5 tür) bulunmuştur. Asplanchna priodonta, Keratella cochlearis, Keratella tecta, Polyarthra dolichoptera, Synchaeta pectinata, Bosmina longirostris ve Chydorus sphaericus gölde yaygın olarak görülen türlerdir. Su sıcaklığı 3,9-24,6 °C arasında; pH 8,1 ila 8,8 arasında; elektriksel iletkenlik 341 µS/cm ile 434 µS/cm arasında; çözünmüş oksijen değerleri 5,8 mg/L'den 11,1 mg/L'ye kadar değişmiştir. Sıklık indeksine (% F) göre en baskın türler B.longirostris (%74), K. cochlearis (%62), A. priodonta (%54) ve C. sphaericus (%51)'dur. Bölgeden ilk kez toplam 20 tür rapor edilmiştir. Gölde yeni bildirilen türler: rotifera, A. priodonta, Brachionus angularis, Brachionus calyciflorus, Colurella colurus, Keratella quadrata, Lecane clostrocerca, Lecane ludwigi, Lecane luna, Lecane lunaris, Lecane ohioensis, Lecane quadridentata, Lecane sp., Mytilina mucronata, Notholca acuminata, Notholca squamula, Trichotria tetractis, cladocera Acroperus harpae, Daphnia cucullata ve copepoda Eucyclops macrurus ve Megacyclops gigas. Sládeček (1983) indeksine göre Brachionus / Trichocerca (QB/T) oranı dikkate alındığında; göl mezotrofik özellik göstermiştir.

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