Phytoplankton Composition of Ürkmez Dam Lake (İzmir-Türkiye)

Öz

Ürkmez Dam Lake is located within the borders of the Seferihisar district of İzmir province and was built between 1985 and 1989 years to meet the water needs for drinking and usage purposes. The dam has a body fill type of soil, a height of 45 m from the thalweg, a body volume of 991 dam³, a lake area of 1 km² at normal water level and a lake volume of 7 hm³. The water resources of this dam lake, which is approximately 35 m above sea level, are rainwater and the Ürkmez stream, which gives its name to the dam. The aim of this study was to determine the phytoplankton composition of Ürkmez Dam Lake (İzmir-Türkiye) and to carried out the seasonal changes in phytoplankton. For this study, phytoplankton samples were taken from a selected sampling point at monthly intervals between March 2014 and February 2015 and some physical parameters were measured in situ. Temperature measurements in the surface, middle and bottom waters of Ürkmez Dam Lake showed changes between 9.0-28.3 oC at the surface, 8.8-27.4 oC at the middle depth and 8.6-16.6 oC at the bottom. Depth varied between 10-23 m and Secchi depth varied between 0.6-3.6 m. A total of 28 taxa belonging to the divisions Cyanobacteria (5 taxa), Chlorophyta (7 taxa), Myzozoa (3 taxa), Euglenozoa (4 taxa), Ochrophyta-Bacillariophyceae (6 taxa), Ochrophyta-Chrysophyceae (2 taxa) and Cryptophyta (1 taxa) were identified in Ürkmez Dam Lake during the study period. These findings have contributed to the literature revealing the freshwater algal flora and distribution of Türkiye. It was evaluated that these taxa are commonly observed in Turkish dam lakes and are mostly compatible with aquatic ecosystems with mesotrophic and unstable water column.

Anahtar Kelimeler

• Ürkmez Reservoir
• phytoplankton
• succession
• mesotrophic

Ürkmez Baraj Gölü (İzmir-Türkiye)’nün Fitoplankton Kompozisyonu

Öz

Ürkmez Baraj Gölü İzmir ilinin Seferihisar ilçesi sınırları içerisinde yer almakta olup, 1985 ve1989 yılları arasında, içme ve kullanım amaçlı su ihtiyacını karşılamak üzere inşa edilmiştir. Barajın, gövde dolgu tipi toprak, talvegden yüksekliği 45 m, gövde hacmi 991 dam3, normal su kotunda göl alanı 1 km2 ve göl hacmi 7 hm3dir. Deniz seviyesinden yüksekliği yaklaşık 35 m olan, bu baraj gölü’nün su kaynaklarını yağmur suları ve baraja adını veren Ürkmez deresi oluşturmaktadır. Bu çalışmada, Ürkmez Baraj Gölü’nün fitoplankton kompozisyonunun belirlenmesi ve fitoplanktonun mevsimsel değişimlerinin ortaya konması amaçlanmıştır. Bu çalışma için, Mart 2014 ve Şubat 2015 ayları arasında ve belirlenen bir örnekleme noktasından aylık periyotlarla fitoplankton örnekleri alınmış ve yerinde bazı fiziksel parametreler ölçülmüştür. Ürkmez Baraj Gölü’nde yüzey, orta ve dip suyunda yapılan sıcaklık ölçümleri, yüzeyde 9,0-28,3 oC arasında, orta derinlikte 8,8-27,4 oC arasında, dipte 8,6-16,6 oC arasında değişimler göstermiştir. Derinlik 10-23 m arasında, Secchi derinliği ise 0,6-3,6 m arasında değişmiştir. Ürkmez Baraj Gölü’nde Cyanobacteria (5 takson), Chlorophyta (7 takson), Myzozoa (3 takson), Euglenozoa (4 takson), Ochrophyta-Bacillariophyceae (6 takson), Ochrophyta- Chrysophyceae (2 takson) ve Cryptophyta (1 takson) bölümlerine ait olmak üzere, toplam 28 takson çalışma süresi boyunca tespit edilmiştir. Bu bulgular ile Türkiye tatlısu alg florasının ve dağılımlarının ortaya koyan literatüre katkılar sağlanmıştır. Bu fitoplankton taksonlarının, Türkiye baraj göllerinde yaygın olarak gözlendiği ve çoğunlukla mezotrofik ve kararsız su kolonuna sahip sucul ekosistemlere uyumlu oldukları değerlendirilmiştir.

Anahtar Kelimeler

• Ürkmez Dam Lake
• Biodiversity
• Algal Flora
• Succession
• Mesotrophic

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