The study was conducted in Nif Stream (İzmir) and the aims of the study are (a) to determine the benthic macro-invertebrate composition of the stream, (b) to determine environmental features of the stream, (c) to investigate the relations between the determined species and the environmental variables and (d) to assess the trophic level of the stream which was under the pressure of industry, agriculture and settlement. Samplings of macrobenthic invertebrates were performed seasonally at eight stations between October 2013 and September 2014 in addition to measuring environmental variables of the localities. 11571 specimens were investigated and totally 77 taxa were determined. Chironomidae and Oligochaeta were the higher groups in terms of species richness with 25 and 17 species, respectively. Multivariate analyses indicate that pH, Ca 2+ and NO 3 -N were the most effective variables and explained 48.6% of the variance in the distribution and abundance of benthic macroinvertebrates in Nif Stream. Along the measured physicochemical characteristics and scores of biological indices, the upper branches of the stream have good quality water while the middle and lower parts are heavily polluted.

Sonuç olarak, göllerin fitoplankton kompozisyonu ve diğer bazı ekolojik değerleri, inceleme yapılan göllerin verimlilik durumunun oligotrofik olduğunu göstermektedir. Bu çalışmada, Türkiye'nin dağ göllerinin fitoplankton kompozisyonu ve limnolojisi hakkındaki bilgilere katkılar sağlanması amaçlamıştır.

Turkish lakes which have different morphometry and hydrology, have a great potential that supports distinct algal diversity as a result of different climate types and geographical variation (latitudinal, longitudinal, and altitudinal gradients). However, the algal flora of Turkey has not been completed, and the number of new taxa has increased due to new studies in Turkey. This study aims to describe new planktonic algal taxa for the Turkish freshwater algal flora. A total of 330 Chlorophyta, 164 Cyanobacteria and 187 Euglenozoa taxa were determined in a study conducted from 2017 to 2019 in 275 lakes of 25 river basins of Turkey. During this study, 116 Chlorophyta, 41 Cyanobacteria, and 81 Euglenozoa were found new records for the freshwater algal flora of Turkey.

The present study aimed to contribute to the algal flora of Turkey by Bacillariophyta (diatom) as new records for the Turkish freshwater algal flora. Phytobenthos and phytoplankton were sampled three times (spring, summer, and autumn) a year between 2017 and 2019. Samples of the phytoplankton were collected with a water sampler from three depths, and samples of diatoms were obtained as epiphytic in the littoral zone of the lakes. However, if macrophytes were absent, epilithic or epipelic diatoms were sampled in lakes. Also, samples of phytobenthos were preferred as epilithic in rivers. However, if stones were absent, epiphytic or epipelic diatoms were sampled. During the studied period, a total of 895 diatom taxa were determined as planktonic (378 taxa) and benthic (860 taxa) in lakes and rivers of 25 river basins of Turkey, and a total of 44 new records were identified. The highest diatom taxa were determined in the Fırat-Dicle, Konya, Antalya, and Büyük Menderes basins with 13, 12, 10, and 7 taxa, respectively. On the other hand, new records were not detected in 10 basins.

Although planktonic algae are a basic component of freshwater ecosystems, studies on their diversity and species distribution are still not in satisfactory numbers. This study aims to contribute to Turkish freshwater algal flora particularly with the new records reported. A total of 158 Charophyta taxa were determined in the study conducted from 2017 to 2019 in 25 river basins of Turkey. In this study, while the highest Charophyta taxon was found in Sakarya and Batı Akdeniz basins with 50 and 42 taxa, respectively, Burdur basin was the only basin where we did not find the Charophyta species. The highest Charophyta diversity was observed in Girdev Lake (Batı Akdeniz basin) and Işık Dağı Karagöl Lake (Sakarya basin) among the lakes of Turkey's 25 river basins. Thirty-one of these Charophyta taxa represent new records for the freshwater algal flora of Turkey. Of these, 13 species are commonly distributed, while 18 species have rare distribution areas. Morphology, ecology, and distribution of each taxon were also discussed in details.Özet: Planktonik algler tatlı su ekosistemlerinin temel bir bileşeni olmasına rağmen, onların çeşitliliği ve tür dağılımları konusundaki çalışmalar hala tatmin edici sayılarda değildir. Bu çalışma, özellikle raporlanan yeni kayıtlarla Türkiye tatlı su alg florasına katkıda bulunmayı amaçlamaktadır. 2017-2019 yılları arasında Türkiye'nin 25 nehir havzasında yapılan bu çalışmada toplam 158 Charophyta taksonu tespit edilmiştir. Bu çalışmada, en yüksek Charophyta taksonuna sırasıyla 50 ve 42 takson sayısıyla Sakarya ve Batı Akdeniz havzalarında rastlanırken, Charophyta türüne rastlamadığımız tek havza Burdur olmuştur. Türkiye'nin 25 akarsu havzasındaki göller arasında en fazla Charophyta çeşitliliği Girdev Gölü (Batı Akdeniz havzası) ve Işık Dağı Karagöl (Sakarya havzası)'de görülmüştür. Tespit edilen bu Charophyta taksonlarının 31'i Türkiye'deki tatlısu alg florası için yeni kayıt niteliğindedir. Bunlardan 13 tür yayılış alanı olarak yaygın iken, 18 tür nadir yayılış alanına sahiptir. Her bir taksonun morfolojisi, ekolojisi ve dağılımı da ayrıntılı olarak verilmiştir.(1) Akşehir Lake, (2) Eber Lake, (3) Akdeğirmen Reservoir, (4) 26 Ağustos TP Lake, (5) Karamık Reeds, (6) Ağzıkara Pond, (7) Tınaztepe Pond, (8) Gezler Pond, (9) Şehit Uz. Çvş. Nurullah Oymak Pond, (10) Tazlar Satı Gelin Pond 2 Antalya 9(11) Eğirdir Lake, (12) Kovada Lake, (13) Gölcük Lake, (14) Cemalalanı Lake, (15) Duruca Lake, (16) Eğri Lake, (17) Küllü Lake, (18) Titreyen Lake, (19) Düden Lake 3 Aras 3 (20) Aktaş Lake, (21) Çıldır Lake, (22) Aygır Lake 4 Asi 8 (23) Reyhanlı (Yenihisar) Lake, (24) Yayladağ Reservoir, (25) Tahtaköprü Reservoir, (26) Karagöl Lake, (27) Adsız Lake, (28) Yarseli Reservoir, (29) Üçpınar Pond, (30) Sapkanlı Pond 5 Batı Akdeniz 13(31) Gölhisar Lake, (32) Girdev Lake, (33) Avlan Lake, (34) Dalaman Wetlands, (35) Denizcik Lake, (36) Kocagöl Lake, (37) Kusuru Lake, (38) Köycegiz Lake, (39) Küçükdalyan Lake, (40) Yeşilgöl Lake, (41) Yazır Lake, (42) Baranda Lake, (43) Pozan Lake 6 Batı Karadeniz 14(44)...