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    An updated review of alien species on the coasts of Turkey
    (Natl Centre Marine Research, 2011) Cinar, M. E.; Bilecenoglu, M.; Ozturk, B.; Katagan, T.; Yokes, M. B.; Aysel, V.; Dagli, E.
    This 2010 review of alien species along the coasts of Turkey represents a total of 400 alien species belonging to 14 systematic groups. The present paper also reports the first findings of Vanderhorstia mertensi in the Aegean Sea (Gokova Bay), Chama adspersa in the Sea of Marmara and Mya arenaria in the Aegean Sea. A total of 124 new alien species was determined within the last 5 years. Mollusca had the highest number of species (105 species), followed by Polychaeta (75 species), Crustacea (64 species) and Pisces (58 species). The highest number of alien species (330 species) were encountered on the Levantine coast of Turkey, followed by the Aegean Sea (165 species), Sea of Marmara (69 species) and Black Sea (20 species). The Suez Canal (66% of the total number of alien species) is the main vector for species introductions to the coasts of Turkey, followed by the shipmediated transport (30%). The majority of species (306 species, 76% of total number of species) have become established in the area, while 59 species are classified as casual (15%), 23 species as questionable (6%) and 13 species as cryptogenic (3%). One new alien species was introduced to the coasts of Turkey every 4 weeks between 199:1 and 2010. The majority of aliens were found on soft substratum (198 species) in shallow waters (0-10 m) (319 species). Some species such as Caulerpa racemosa, Amphistegina lobifera, Amphisorus hemprichii, Rhopilema nomadica, Mnemiopsis leidyi, Hydroides spp., Ficopomatus enigmaticus, Charybdis longicollis, Rapana venosa, Asterias rubens, Siganus spp. and Lagocephalus sceleratus show a highly invasive character, and have great impacts both on the prevailing ecosystems and humans.
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    Seasonal Effects of Environmental Variables on Molluscan Communities in cardak Lagoon (Turkish Straits)
    (Maik Nauka/Interperiodica/Springer, 2023) Ates, A. S.; Dogan, A.; Acar, S.; Buyukates, Y.; Dagli, E.; Bakir, A. K.; Mulayim, A.
    In the present study, the effects of environmental variables on the community of molluscans found in a protected lagoon system (cardak Lagoon, Dardanelles) polluted by domestic waste were investigated. Samplings were performed from sandy and silty bottoms of the study area between the depths of 1 and 1.8 m in October 2018, February, April, and June 2019. A total of 14954 specimens and 59 molluscan species (2 Polyplacophora, 30 bivalves, and 27 gastropods) were found, with two exotic species, Arcuatula senhousia and Ruditape sphilippinarum. Highest gastropod abundance was observed in autumn 2018, while the highest bivalves abundance was in spring 2019. Considering environmental variables, gravel content had highest correlation with Shannon-Weaver and Turkish Biotic Index values. In addition, anionic detergent derived from domestic pollution affected diversity. Environmental variables of anthropogenic origin were found to modify the community structure at high level. Dissolved oxygen, oxygen reduction potential, nitrite + nitrate, and chemical oxygen demand concentrations in water, and sand content in sediment were important variables affecting the distribution of molluscan species in the study area.