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Öğe A brief look at the free-living Nematoda of the oxic/anoxic interface with a new genus record (Trefusia) for the Black Sea(Walter De Gruyter Gmbh, 2015) Urkmez, Derya; Brennan, Michael L.; Sezgin, Murat; Bat, LeventIn order to provide the first comparative source of nematofaunal data at the oxic/anoxic interface off the Sinop Peninsula, the southern Black Sea, a survey of meiofauna and nematode fauna was conducted in August 2011 aboard the exploration vessel (E/V) Nautilus with ROV during the Black Sea Expedition NA012. Higher meiofaunal taxa and nematode composition were investigated. Free-living marine nematodes were the most abundant group at each site. A total of 84 species were found, belonging to 23 families. The suboxic zone was dominated by the nematode Trefusia aff. longicauda (42%). This is the first record of the genus Trefusia De Man, 1893 for the Black Sea. Although many factors are likely to influence the changes in the meiofaunal abundance and the composition of nematode assemblages, we suggest that oxygen reduction indeed affected the meiofaunal abundance and the nematode composition, however, a particular preference of several taxa for extreme conditions may be suggested.Öğe A new species of Halaphanolaimus (Nematoda: Leptolaimidae) from the southern Black Sea (Turkey) with a modified key for species identification(Magnolia Press, 2013) Urkmez, Derya; Brennan, Michael L.Halaphanolaimus sergeevae n. sp. is described and illustrated from the Sinop coasts (southern Black Sea, Turkey). The new species morphologically resembles H. pellucidus Southern, 1914, but differs from it by having a higher number of tubular supplements (12-14 vs 6-7), longer spicules (68-70 mu m vs 47-52 mu m), smaller tail/spicule ratio (1.6 vs 2.7), smaller body size (926-1273 vs 1500 mu m), and smaller De Man indices of a, b and c'. An updated identification key to the species of Halaphanolaimus is proposed.Öğe Description of Megastygarctides sezginii sp nov (Tardigrada: Arthrotardigrada: Stygarctidae) from the Turkish Black Sea coast and a key to the genus Megastygarctides(Taylor & Francis As, 2018) Urkmez, Derya; Ostrowska, Marta; Roszkowska, Milena; Gawlak, Magdalena; Zawierucha, Krzysztof; Kristensen, Reinhardt Mobjerg; Kaczmarek, LukaszIn this paper, Megastygarctides sezginii sp. nov., a new marine species fromthe Black Sea (Turkey), is described. Morphological and morphometric studies have revealed that M. sezginii sp. nov. is most similar to M. setoloso Morgan & O'Reilly, 1988, but differs from it through the presence of two types of fibrils, a lack of cuticle granulation, the presence of three lateral projections with fibrils, leg fibrils arranged in transverse stripes and the presence of clumps of fibrils near the clavae. In the studied environment, the new species is frequently found in summer and almost absent in winter. Additionally, a taxonomic key for all Megastygarctides species is presented.Öğe Diversity of Platyhelminthes, Xenacoelomorpha, Nematoda, Acanthocephala, Brachiopoda, Kinorhyncha, Nemertea, Chaetognatha, Tardigrada, Gastrotricha, Rotifera, Phoronida, Echinodermata, and Chordata (Tunicata, Cephalochordata, and Hemichordata) from the coasts of Turkiye(Tubitak Scientific & Technological Research Council Turkey, 2024) Cinar, Melih Ertan; Urkmez, Derya; Yokes, BakiThe current biodiversity of 14 phyla, namely Platyhelminthes, Xenacoelomorpha, Nematoda, Acanthocephala, Brachiopoda, Kinorhyncha, Nemertea, Chaetognatha, Tardigrada, Gastrotricha, Rotifera, Phoronida, Echinodermata, and Chordata (invertebrates only, including the subphyla Tunicata, Cephalochordata, and Hemichordata) from the coasts of T & uuml;rkiye is revisited. It was found that a total number of 695 species occur along all the coastlines of T & uuml;rkiye, with the Black Sea being represented by 297 species, the Sea of Marmara by 305 species, the Aegean Sea by 308 species, and the Levantine Sea by 204 species. The most species-rich phyla in these regions were Platyhelminthes (249 species), Nematoda (131), Echinodermata (98), and Chordata (85). A total of 26 alien species have been reported from the regions to date, of which one species belongs to Chaetognatha, 8 species to Echinodermata, and 17 species to Tunicata. The highest number of alien species (17) was encountered in the Levantine Sea and the lowest (2) was in the Black Sea.Öğe Ecological Status of the Sevastopol and Sinop Bays(Mediterranean Coastal Foundation-Medcoast Foundation, 2015) Osadchaya, Tatyana; Alyomov, Sergey; Sezgin, Murat; Bat, Levent; Urkmez, DeryaPresent review is devoted to comparison of the information-ecological portraits of two coastal areas located in the northern (Sevastopol region) and southern (Sinop area) parts of the Black Sea and is based on the results of monitoring studies of the Department of Marine Sanitary Hydrobiology (of a former IBSS and the Institute of Marine Biological Research at present) and the Marine Biology Department of Sinop University Fisheries Faculty. The regions under consideration are an ideal ground for a comparison between coastal ecosystems having the similar ecological risks.Öğe Exploration of the Anaximander Mountains: Mud Volcanoes, Cold-Seep Communities, and Cold Water Corals(Oceanography Soc, 2013) Raineault, Nicole A.; Ramey-Balci, Patricia A.; Shank, Timothy M.; Bors, Eleanor; Duman, Muhammet; Urkmez, Derya; Tuzun, Suna[No abstract available]Öğe Meiobenthic Assemblages from the Southwestern Coast of the Black Sea, Igneada (Turkey)(Springer, 2016) Urkmez, Derya; Sezgin, Murat; Karacuha, Melek Ersoy; Oksuz, IbrahimMeiobenthic organisms were sampled for the first time from. Igneada coasts, Turkey (Western Black Sea) in order to provide a base-line study on the meiobenthic community structure of the sampling area. Meiobenthos was found to be composed of 12 higher taxonomical groups: Nematoda, Harpacticoida, Polychaeta, recent hard-shelled Foraminifera, soft-shelled Foraminifera, Bivalvia, Gastropoda, Ostracoda, Turbellaria, Oligochaeta, Nemertea and Acari. Meiobenthic community was dominated by nematodes, harpacticoid copepods and hard-shelled foraminifera in the study area. Fifty two species of Nematoda, fifteen species of Harpacticoida and twelve species of living hard-shelled Foraminifera were identified. Six nematode species (Bathylaimus australis, Bolbolaimus murinae, Neochromadora poecilosomoides, Neochromadora sabulicola, Oncholaimellus mediterraneus and Onyx perfectus) are reported for the first time from Turkey although they are known to occur at the central Turkish Black Sea. Total density of the meiobenthos ranged between 67-757 ind. 10 cm(-2) at stations. Nematodes showed densities ranging from 61 to 350 ind. 10 cm(-2) which represented 25-92% of the total meiobenthos. Since the terrestrial part of the region is protected as a National Park and the coastal part has been proposed as a marine protected area, research should be intensified on the fauna of. Igneada coastal waters to clarify the biodiversity of the area.Öğe Meiobenthic nematodes at the deep oxic/anoxic boundary of the Black Sea (Istanbul Strait Outlet Area) with new records for Turkey(Elsevier, 2021) Sergeeva, Nelli G.; Urkmez, Derya; Revkova, TatianaInvestigations were conducted at nine stations along the oxic/anoxic interface in the Istanbul Strait's (Bosphorus) outlet area of the Black Sea (ISBS). Present work stands as the first study on the distribution patterns of nematodes along water depths between 75 m and 300 m at the ISBS and gives information on the variability of the trophic relationships of nematodes with oxygen depletion and the presence of toxic hydrogen sulfide in the environment. Nematodes were represented by 137 species from 63 genera and 30 families at the studied depths. 34 species were reported for the first time from Turkey. The presented results showed that most of the nematode species in this region were identified only to the genus and even only to the family or order level. This suggested that the fauna of free-living nematodes of the Black Sea as a whole is much more diverse than is currently known, and requires further taxonomic studies. (c) 2021 Elsevier B.V. All rights reserved.Öğe MEIOBENTHIC RESEARCH ON THE BLACK SEA SHELF OF TURKEY: A REVIEW(Turkish Marine Research Foundation-Tudav, 2017) Urkmez, Derya; Sezgin, Murat; Sergeeva, Nelli G.[No abstract available]Öğe Micoletzkyia longispicula Huang & Cheng, 2011 (Nematoda: Phanodermatidae) in Turkey: First record outside the type locality(Centre for Biodiversity of Montenegro, 2016) Urkmez, Derya; Sezgin, Murat[No abstract available]Öğe Ocean dynamics and anthropogenic impacts along the southern Black Sea shelf examined through the preservation of pre-modern shipwrecks(Pergamon-Elsevier Science Ltd, 2013) Brennan, Michael L.; Davis, Dan; Roman, Chris; Buynevich, Ilya; Catsambis, Alexis; Kofahl, Meko; Urkmez, DeryaContinued exploration of the coastal area of the southern Black Sea off Sinop and Eregli, Turkey in 2011 expanded our current understanding of the transition zone along the oxic/anoxic interface. Push cores collected with an ROV in sediments underlying the oxic, suboxic, and anoxic waters were analyzed for geochemistry, meiofauna, and microbiology to help characterize this transition zone. During the course of side-scan sonar surveys, nine shipwrecks were located in various states of preservation, all within 100-115 m depth and ranging from the 4th century B.C. to the early 20th century. Many of these wrecks have wooden components well preserved due to the influences of anoxic waters being washed up along the shelf by internal waves. However, a number of these sites have been heavily damaged by bottom trawling along the seabed up to the shelf break, highlighting the persistent threat such activities pose to submerged archaeological sites. (C) 2012 Elsevier Ltd. All rights reserved.Öğe The genus Setaphyes (Kinorhyncha, Pycnophyidae) in European waters: Redescription of Setaphyes dentatus (Reinhard, 1881) and Setaphyes kielensis (Zelinka, 1928), including notes on morphometrics, sexually dimorphic features and reproduction of the genus(Elsevier Gmbh, 2023) Gonzalez-Casarrubios, Alberto; Cepeda, Diego; Neuhaus, Birger; Garcia-Cobo, Marta; Pardos, Fernando; Urkmez, Derya; Sanchez, NuriaSix of the eight species of the genus Setaphyes have been described from Europe. In the present contribution, the European Setaphyes species are revised and two of them, S. dentatus (Reinhard, 1881) and S. kielensis (Zelinka, 1928), are redescribed following the current approaches of Kinorhyncha taxonomy. For this purpose, material from 17 localities throughout the Atlantic Ocean and the Mediterranean and Black Seas was investigated. The redescriptions of two of the most common pycnophyid species in Europe include detailed information on intraspecific variation among populations. Setaphyes dentatus is characterized by the presence of middorsal el-evations on segments 2-6, and middorsal processes on segments 1, 7-9, unpaired paradorsal setae on segments 2-9; laterodorsal setae on segments 3, 5 and 7; ventromedial setae on segments 4-5, 7-8 in males and 3-5, 7-9 in females; anterior cuticular, reticulate ridges on the tergal plate of segment 1 and conspicuous patch of later-odorsal and ventrolateral longitudinal, cuticular ridges on segment 10. Setaphyes kielensis is characterized by middorsal elevations on segments 1-9; paired paradorsal setae on segments 2-9 (unpaired on segment 8); lat-erodorsal setae on segments 2-9; ventromedial setae on segments 3-9. Furthermore, morphometric features of the European Setaphyes are analysed. Specifically, the morphometric analyses revealed sex-specific variability in the LTS/TL proportion, with females of all the European species of Setaphyes showing smaller LTS/TL. Thus, the LTS/TL ratio unveils a conspicuous sexual dimorphism in the genus.Öğe Toxicity of synthetic Endocrine Disrupting Compounds on meiofauna: Estradiol benzoate as a case study(Elsevier Sci Ltd, 2021) Essid, Naceur; Faiza, Manel; Hedfi, Amor; Almalki, Mohammed; Urkmez, Derya; Boufahja, FehmiAn experimental study was carried out to determine the effects of the enrichment of sediments by endocrine perturbators on free-living nematodes from the Ghar El Melh lagoon, Tunisia. For 30 days, four concentrations of Estradiol Benzoate (hereafter EB) (0.43, 4.3, 8.6 and 12.9 ng l(-1)). The average nematode abundances showed a significant increase after the introduction of EB in their close environment. In contrast, the taxonomic examination has shown a decrease in species diversity of nematodes. The ordination of treatments according to the nMDS showed a clear structural separation of the enriched replicates with EB from controls based on species lists, in particular for concentrations EB3 and EB4. Indeed, under such conditions, the nematofauna exhibited a more remarkable presence of a new record for Science Theristus n. sp. and a decrease in relative abundances of Paracomesoma dubium. On feeding level, a predominance of non-selective deposit-feeders and a decline in proportions of epistrate feeders and carnivorous omnivores was observed with increasing concentrations of EB. Furthermore, in treated replicates with EB, females discernibly showed an increase compared to controls. Overall, EB affect significantly features of meiobenthic nematodes starting from the concentration of 4.3 ng l(-1).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.
