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    Benthic invertebrate fauna of Urla Harbour (Izmir Bay, Aegean Sea) and its vicinity
    (Ege Univ, 2007) Aydin, Ozden; Onen, Mesut; Dogan, Alper; Dagli, Ertan; Sezgin, Murat; Katagan, Tuncer; Ozturk, Bilal
    In order to determine benthic invertebrate fauna of Urla Harbour and its vicinity, four samplings were performed at 8 stations between February 2001 and December 2001. As a result, 283 species and 14492 individuals belonging to 8 systematic groups were determined. Seasonal fluctuations at the stations were examined and conspicuous seasonal changes at the stations 2 and 3, because of pollution in the harbor, were observed.
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    Macro-benthic invertebrates associated with the black sponge Sarcotragus foetidus (Porifera) in the Levantine and Aegean Seas, with special emphasis on alien species
    (Academic Press Ltd- Elsevier Science Ltd, 2019) Cinar, Melih Ertan; Bakir, Kerem; Dogan, Alper; Acik, Sermin; Kurt, Guley; Katagan, Tuncer; Ozturk, Bilal
    The fauna associated to the sponge Sarcotragus foetidus was studied in two eco-regions of the Mediterranean Sea, the Aegean and Levantine Seas. A total of 134 species belonging to 8 taxonomic groups were determined. Different species assemblages were encountered in the eco-regions, mainly due to the importance of some alien species (Red Sea invaders) on sponge communities. Among community parameters, only the number of species differed significantly among the sub-regions. The number of species and the number of individuals were significantly and positively correlated with the sponge volume. The species assemblage patterns determined were significant correlated with a set of environmental variables such as nitrogen, phosphate and dissolved oxygen. Some alien species such as the ophiuroid Ophiactis savignyi and the polychaete Leonnates indicus densely invaded porous systems of sponges in the Levantine Sea, indicating the magnitude of impacts of alien species on the eastern Mediterranean ecosystem. In the Levantine Sea, the alien species accounted for 34% of total number of individuals of macro-invertebrates associated with sponges, but the percentage rose up to 64% in Iskenderun Bay (eastern-most point of studied area). The biotic index ALEX detected a moderate ecological status in the area in terms of the impacts of alien species on native biodiversity.
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    Macrobenthic fauna associated with the invasive alien species Brachidontes pharaonis (Mollusca: Bivalvia) in the Levantine Sea (Turkey)
    (Cambridge Univ Press, 2017) Cinar, Melih Ertan; Bakir, Kerem; Ozturk, Bilal; Katagan, Tuncer; Dogan, Alper; Acik, Sermin; Kurt-Sahin, Guley
    The invasive alien mytilid species, Brachidontes pharaonis, forms a biogenic habitat in the mediolittoral and upper-infralittoral zones of the Levantine Sea, hosting a number of alien and native species. Examinations of samples taken from dense, continuous mussel beds at seven stations along the coast of northern Levantine Sea yielded 187 macro-benthic invertebrate species belonging to 11 taxonomic groups. Polychaeta accounted for 46% and 37% of the total number of species and individuals, respectively. The top three dominant species in the mussel beds were Stenothoe gallensis, Spirobranchus kraussi and Mytilaster minimus. The species with the highest frequency values on the mussel beds were Pseudonereis anomala, Phascolosoma stephensoni and Elasmopus pocillimanus. The highest density and biomass of the associated fauna were estimated as 42,550 ind m(-2) and 1503 wwt g m(-2), respectively. The species number in samples varied between 14 and 47 species. The environmental variables best explaining variations in zoobenthic community structures were salinity, dissolved oxygen and total inorganic nitrogen in the water column. The biotic indices, TUBI and ALEX, classified the ecological status of one or two stations as moderate or poor, based on the relative abundances of ecological and zoogeographic groups, respectively. A total of 21 alien species were found to be associated with the mussel bed, of which Syllis ergeni is being newly considered as a new established alien species for the Mediterranean Sea. The maximum density of associated alien species was calculated as 30,300 ind m(-2). The alien species assemblages were greatly affected by salinity and total inorganic nitrogen.
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    Macrozoobenthic community structure of Igneada region in Turkey (the southwestern Black Sea)
    (Walter De Gruyter Gmbh, 2017) Kurt-Sahin, Guley; Sezgin, Murat; Unluer, Fikriye; Ozturk, Bilal; Cavdar, Ertan; Dagli, Ertan
    The present study deals with macrozoobenthic species on soft substrates in Igneada (Turkish coast of the Black Sea). Benthic samples were collected seasonally at three stations between 2012 and 2013. A total of 155 species belonging to seven taxa (Turbellaria, Nemertea, Nematoda, Oligochaeta, Polychaeta, Crustacea, Phoronida, Mollusca, Hemichordata) were identified. Of these, four species are new records for the Black Sea fauna, 15 species are new to the Turkish coast of the Black Sea; and two species are new to the Turkish Seas. Polychaeta was the most representative taxon in the study area - it was represented by 58 species (39% of the total number of species). In terms of the number of individuals, Mollusca were the dominant taxon in all seasons (82% of the total number of individuals). The most dominant species were Bittium reticulatum and Caecum trachea and the most frequent species were Micronephtys stammeri, B. reticulatum and Chamelea gallina.
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    Spatial distribution pattern of macroinvertebrates associated with the black mussel Mytilus galloprovincialis (Mollusca: Bivalvia) in the Sea of Marmara
    (Elsevier, 2020) Cinar, Melih Ertan; Bakir, Kerem; Ozturk, Bilal; Dogan, Alper; Acik, Sermin; Kirkim, Fevzi; Dagli, Ertan
    The present study deals with benthic community structures of mussel beds (Mytilus galloprovincialis) in the Sea of Marmara, including the canakkale and Istanbul Straits. The Sea of Marmara's mussel beds were mainly formed by small-sized mussel individuals (shell length < 4 cm). Macrobenthic species associated with the mussels support high diversity in the region, comprising 184 species belonging to 11 taxonomic groups. The annelids (38% of total number of species) were the most diverse group and arthropods (48% of total number of individuals) the most abundant. Motile species numerically dominated mussel beds at stations, while epibiont fauna were relatively low in terms of number of species and abundance. Five different species assemblages were identified in the region, which appeared to be mainly influenced by some biotic (e.g. mussel biomass, alien species) and abiotic (e.g. salinity) factors. The assemblages were mainly characterized by having high abundances of three crustacean (Jassa marmorata, Hyale schmidti and Melita palmata) and one polychaete (Platynereis dumerilii) species. Seven alien species were found at stations, of which the small-sized anthozoon Diadumene cincta accounted for 86% of total number of individuals of alien species.