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In order to determine the relationships between the dynamics of benthic macroinvertebrates (both species number and individual number) and environmental variables, sampling was made at four different stations at monthly intervals during a year between March 2004 and January 2005 of Lake Gala which is a part of an important wetland and a national park in European part of Turkey (Enez/Edirne). Altogether, a total of 49 zoobenthic taxa which were grouped as "Oligochaeta", "Chironomidae", and "Varia", comprised of 1,628 individuals in per m 2 at average were recognised in the sampling stations of the Lake. The present study showed that larval chironomids comprising 57% abundance of the total specimens are the biggest part of benthic macroinvertebrates. It is followed by oligochaetes and the group varia comprising 34% and 9% abundance, respectively. Also, it was seen changing that the composition of zoobenthic group dominancy in the Lake as time passes.Furthermore, according to Shannon-Weaner index, species diversity for zoobenthic macroinvertebrate fauna of the lake was found as H'=1.21 at average. Also, similarities of the sampling stations and months, both the dynamics of benthic macroinvertebrates and physicochemical features were evaluated by using Bray-Curtis similarity index.According to Spearman correlation index, relationship between the number of individuals and some physicochemical variables such as temperature, turbidity (light permeability), and depth of the lake was determined statistically significant.

Öz: Ege Denizi'nin önemli adalarından olan Gökçeada iç sularında dağılım gösteren Amphipod türlerinin tespit edilmesi amacıyla, farklı tarihlerde adadaki 17 lokaliteden toplanmış olan örnekler incelenmiştir. Örnekler 500 µm göz açıklığındaki el kepçeleri ile toplanmış olup, sahada %4'lük formaldehit solüsyonu içinde fikse edilmişlerdir. Çalışma sonucunda, örnekleme yapılan istasyonlarda Gammaridae ve Talitridae familyalarına ait toplam 3 türün [Gammarus komareki Schäferna 1922, Gammarus aequicauda (Martynov, 1931 ve Orchestia mediterranea Costa, 1853] dağılım gösterdiği tespit edilmiştir. Tespit edilen türler Gökçeada'dan ilk defa kayıt edilmektedir. Anahtar kelimeler: Amphipoda, Gammarus, Orchestia, Gökçeada, TürkiyeAbstract: In order to determine the Amphipod species inhabited the inland waters of the Gökçeada Island, which is the biggest island of Turkey in the Aegean Sea, samples were sampled from 17 localities in different dates, were carried out. Samples were collected with 500 µm mesh-sized hand nets and were fixed in 4% formalin solution in field. As a result, three species [Gammarus komareki Schäferna 1922, Gammarus aequicauda (Martynov, 1931 and Orchestia mediterranea Costa, 1853] belonging to Gammaridae and Talitridae families were determined. All of the three species are newly recorded from Gökçeada Island.

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In the present study, chironomid larvae were sampled periodically between the years 1995-96 during the one year at eight different localities of Ergene River Basin. A total of 60 chironomid taxa (325 individuals/m 2 ) were recorded in the River and its tributaries (Ergene River Basin) during the sampling period. Also, it evaulated the larval chironomid assemblages in Meriç-Ergene River Basin which is amongst the most important wetland area in European part of Turkey. Furthermore, it determined the physicochemical properties of the water to analyse the relationships between species composition of chironomid communities and environmental parameters.Structure of sediment at each sampling station of Ergene River Basin was revealed to determine the substratum preference of the larvae. It was that found sediment nutrient enrichment strongly influenced chironomid assemblage structure. Furthermore, main results due to species diversity, density of populations, similarities for the sampling stations and the substratum types were discussed.According to Shannon index, species diversity of the Basin was found as H'=1.41 at average. Also, Spearman index has indicated that significant correlations were found between chironomid larval densities and some environmental variables such as conductivity (r=-0.708), dissolved oxygen (r=+0.810), biological oxygen demand (r=+0.822), and chemical oxygen demand (r=+0.805) for P<0.05.Keywords: chironomidae, biodiversity, substratum, Ergene River, Turkey. Ergene Nehir Havzası'ndaki (Trakya) Chironomid Larvalarının (Diptera, Chironomidae) Ekolojik Analizi ÖzetBu çalışmada, Ergene Nehir Havzası'ndaki 8 farklı lokaliteden, 1995-96 yılları arasında bir yıl boyunca periyodik olarak chironomid larvası örneklemesi yapıldı. Örnekleme periyodu boyunca, Ergene nehri ve kollarında (Ergene Nehir Havzası), toplamda 60 larval chironomid taksonu (325 birey/m 2 ) kaydedildi. Chironomid kommunitelerinin tür kompozisyonuyla çevresel parametreler arasındaki ilişkiyi saptamak amacıyla, suyun fizikokimyasal özellikleri de belirlendi. Ayrıca, Türkiye'nin Avrupa parçasındaki en önemli sulak alanları arasında bulunan Meriç-Ergene Nehir Havzası'nın larval chironomid içeriği de değerlendirildi.Ergene Nehir Havzası'ndaki örnekleme istasyonlarının her birinin sediment yapısı, larvaların substrat tercihini belirlemek amacıyla kaydedildi. Sedimentin besin zenginliğinin, chironomid topluluğunun yapısı üzerinde güçlü bir etkisi olduğu saptandı. Ayrıca, örnekleme istasyonlarının ve substrat tiplerinin benzerlikleri, tür çeşitliliği ve populasyon yoğunluğu açısından da değerlendirildi.Shannon indeksine göre, havzanın larval tür çeşitliliği ortalaması H'=1,41 olarak belirlendi. Ayrıca, Spearman indeksine göre chironomid larvalarının yoğunluğuyla, bazı çevresel değişkenler (iletkenlik (r=-0,708), çözünmüş oksijen (r=+0,810), biyolojik oksijen ihtiyacı (r=+0,822), ve kimyasal oksijen ihtiyacı (r=+0,805) arasındaki ilişkiler istatistiksel açıdan önemli bulundu (P<0,05).