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  • Küçük Resim
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    Spatio-temporal distributions of zoobenthos in soft substratum of Izmir Bay (Aegean Sea, eastern Mediterranean), with special emphasis on alien species and ecological quality status
    (Cambridge Univ Press, 2012) Çınar, Melih Ertan; Katagan, Tuncer; Öztürk, Bilal; Bakır, Kerem; Dağlı, Ertan; Açık, Şermin; Doğan, Alper; Bitlis, Banu
    The soft-bottom zoobenthic community structure of Izmir Bay was examined seasonally at eight stations (depth-range: 19-67 m) in 2009. A total of 427 species were found. Polychaeta had the highest number of species (50% of total species) and individuals (7596), whereas Echinodermata possessed the highest biomass (47%). The number of species varied from 3 to 79 (0.1 m(-2)), the density from 60 to 5360 ind.m(-2), and the biomass from 1 to 530 g.m(-2). The most numerically dominant species were the polychaetes Aricidea claudiae, Streblospio gynobranchiata, Levinsenia demiri and Sternaspis scutata. The distribution of zoobenthos was strongly related to spatial differences in total organic carbon, sediment texture and depth among different regions of the bay rather than temporal differences among seasons. However, significant seasonal variability in community structure (mainly differences in the relative abundance of species) was present. The inner region of the bay can be classified as 'poor' or 'bad' based on the results of biotic indices (H', AMBI, m-AMBI and BENTIX). Among biotic indices, only H' and m-AMBI appeared to be capable of explaining the bay's benthic quality status. Thirteen alien species were also found. Streblospio gynobranchiata, Prionospio pulchra, Pseudopolydora paucibranchiata and Polydora cornuta formed dense populations in the inner most polluted part of the bay and are considered to be new pollution indicator species in the eastern Mediterranean Sea.
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    Temporal and spatial effects of environmental variables on crustacean communities in Çardak Lagoon (Turkish Straits System) under the influence of domestic pollution
    (Springer Science and Business Media Deutschland GmbH, 2023) Ateş, Abdullah Suat; Mülayim, Ayşegül; Bakır, Ahmet Kerem; Acar, Seçil; Büyükateş, Yeşim; Dağlı, Ertan; Doğan, Alper; Uzundumlu, Sinan; Kedioğlu, Çetin
    This study presents the temporal and spatial effects of domestic pollution on crustacean assemblages in a protected area, Çardak Lagoon (Turkish Straits System). The samplings were performed from sandy and mud (silt + clay) bottoms between 1 and 1.8 m depths in October 2018, February, April, and June 2019. A total of 6920 specimens and 26 species (1 Isopoda, 1 Tanaidacea, 2 Mysidacea, 3 Cumacea, 5 Decapoda, 14 Amphipoda) belonging to crustaceans was found. Highest crustacea abundances were in autumn and winter. Considering the environmental variables, NO2 + NO3 (mg L− 1) and COD (mg L− 1) levels in the water had the highest correlations with abundance for the sampling periods. According to sampling points, the highest correlation value was found between anionic detergent content in the water and the abundance. Crustacean community structure was modified by environmental variables of anthropogenic origin at a higher level. Oxygen, oxygen reduction potential, NO2 + NO3, total nitrogen, chemical oxygen demand and anionic surfactant levels in water and sediment sand content % were major environmental variables affecting the crustacean abundance in the study area temporally.