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Öğe 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, BilalIn 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.Öğe 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, BilalThe 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.Öğe 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, GuleyThe 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.Öğe Parhyale explorator Arresti, 1989 (Amphipoda, Talitroidea)(Brill Academic Publishers, 2008) Bakir, Kerem; Katagan, Tuncer; Sezgin, MuratThe known geographical distribution of the amphipod, Parhyale explorator Arresti, 1989 has been extended with a new record from the Mediterranean Sea. This amphipod was found in September 2005 at the coast of Iskenderun Bay (Levantine Sea, Turkey). The new record reported here is the first confirmation of P. explorator currently living in the Mediterranean Sea.Öğe Peracarid crustacea fauna of rocky communities in Turkish Aegean Sea coasts(Ege Univ, 2005) Kirkim, Fevzi; Sezgin, Murat; Katagan, Tuncer; Kocatas, Ahmet; Ates, A. SuatThis study focused on Crustacea fauna of rocky communities of Turkish Aegean Sea coasts. Samplings were carried out a total of 20 stations was chosen from the upperinfralittoral zone located between the northern toward southern in July and June 1995-1996. A total of 119 species and 3785 specimens belonging to crustacea were recorded. In the study area, Sphaeroma serratum was the highest dominance value with up to 400 specimens (% 10.57), followed by Pisidia bluteli with 319 specimens (% 8.43), Ampithoe ramondi with 279 specimens (% 7.29) and Maera hamigera with 158 specimens. Among the species identified, Maera hamigera ve Stenothoe gallensis are lessepsian species.Öğe Relationships of benthic amphipod communities with environmental variables in the shallow waters of the Dardanelles(Walter De Gruyter Gmbh, 2012) Ates, A. Suat; Sezgin, Murat; Katagan, Tuncer; Ozdilek, H. Goksel; Berber, Selcuk; Kolsal, Secil; Bircan, CuneytThe structure of the benthic amphipod assemblage and its relationship with soft-bottom characteristics (particle size, organic matter, etc.) of the coastal waters at the depths of 0-5 m at the Dardanelles, including the Turkish Straits System, was studied. A SCUBA diver took benthos and sediment samples seasonally using a quadrate system of 30x30 cm as three transects from the 8 different stations between July 2008 and April 2009. A total of 3007 individuals belonging to 50 species was reported. Among these, Corophium acutum Chevreux, 1908 had the highest dominance value (Di%=22.18) and the lowest dominance value belonged to Dexamine thea Boeck, 1861 (Di%=0.03). The highest positive correlation (r(s)=0.57, p < 0.05) was observed between the gravel content (%) and the abundance (ind. m(-2)). The highest sand rate (99.59%) in the sediment was found at the Eceabat site. The lowest rate was at the Kepez Harbour station with a value of 73.01%. The highest H' value (1.53) was recorded at the Eceabat site, and the lowest H' value (H'=0.95) was recorded at the Gallipoli sampling station.Öğe Seasonal trends of soft bottom Crustaceans of Izmir Bay (Aegean Sea)(Brill, 2008) Dogan, Alper; Sezgin, Murat; Katagan, Tuncer; Onen, MesutThis study deals with the structure of populations of Crustacea in Izmir Bay, Aegean Sea, Turkey. Sampling was performed seasonally at 100 stations in three subsections of Izmir Bay in 1995 and 1996, in order to determine the distribution of benthic crustaceans. A total of 160 species, represented by 3818 individuals, and belonging to 8 taxonomic groups was identified, of which amphipods accounted for almost 58% of the total number of species.Öğe The amphipods (Arthropoda: Crustacea) in the Turkish straits with new records(Cahiers De Biologie Marine, 2016) Bakir, Kerem; Sezgin, Murat; Katagan, TuncerThis study, conducted in the Turkish Straits, has revealed 21 new records of amphipods for the Straits and two new records for the Turkish coasts, Iphimedia gibbula and Rhinolabia parthenopeia. Informations about distinctive taxonomic characters, geographical distribution of the species are given and hypotheses are discussed.Öğe THE EXISTENCE OF PARHYALE EXPLORATOR ARRESTI, 1989 (AMPHIPODA, TALITROIDEA) IN THE MEDITERRANEAN SEA (vol 81, pg 557, 2008)(Brill Academic Publishers, 2013) Bakir, Kerem; Katagan, Tuncer; Sezgin, Murat[No abstract available]Öğe Within-year spatio-temporal variation in meiofaunal abundance and community structure, Sinop Bay, the Southern Black Sea(Walter De Gruyter Gmbh, 2016) Urkmez, Derya; Sezgin, Murat; Karacuha, Melek Ersoy; Oksuz, Ibrahim; Katagan, Tuncer; Bat, Levent; Dagli, ErtanThe first comprehensive meiobenthos study was carried out in Turkey, the Southern Black Sea (Sinop) from August 2009 to July 2010. Sediment samples were collected monthly at eight stations at 3 m and 10 m water depths located on four transects. A metal push core sampler (surface area 12.56 cm(2) and length 10 cm) was used to obtain the material. Meiofaunal abundance and composition were examined. The results revealed that the meiofaunal community consists of twenty five higher taxonomic groups. Four groups dominated the community: Nematoda, Harpacticoida, Foraminifera and Polychaeta. Spatial and temporal meiofaunal abundance fluctuated among stations and over time.
