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Öğe A Contribution on the Diet of the Warty Crab, Eriphia verrucosa (Forskal, 1775) by Informative Bayesian Stable Isotope Mixing Models(Maik Nauka/Interperiodica/Springer, 2022) Acar, Secil; Gurkan, Selin Erturk; Ates, A. Suat; Yalçın Özdilek, ŞükranThe present study aims to determine the diet composition of Eriphia verrucosa using an informative and uninformative approach in which the stomach content results were assigned as prior based on this model. A stable isotope mixing model and stomach content analysis were used together to determine the diet and prey-predator relationships of E. verrucosa. A total of 24 crabs and benthic material were collected from depths between 1.5 and 2 m in the Strait of canakkale in July, 2020. The contribution of two different diets was assessed both by prior assignment (informative) and uninformative. According to the stomach content analyses, among the prey, Echinodermata contributed 37% to the diet, followed by Mollusca, especially Gastropoda (18%). In the uninformative model without prior assignment and in the informative model (prior assignment), Gastropoda contributed the most to the diet (57, 66%, respectively).Öğe Assessment of physical carrying capacity of a mariculture zone designated in the Aegean Sea(Springer, 2024) Yigit, Murat; Ergün, Sebahattin; Buyukates, Yesim; Ates, A. Suat; Ozdilek, H. Goksel; Acar, SecilThe present study was conducted to evaluate the physical carrying capacity in a mariculture zone designated for cage aquaculture in the Aegean Sea (Mersin Bay, Izmir, Turkiye). Rapid assessment of carrying capacity for the approval of new investments or capacity increase requests environment-regulated timely management procedures for the sustainable development of the drastically growing cage aquaculture industry in the Mediterranean. Hence, the mathematical estimations earlier developed for the Mediterranean area have been applied for the carrying capacity assessment using the data gathered from eight fish farms operating in the area. The data collected from the farms comprised the information such as current granted production level, surface area, location depth, current speed, shore distance, and coordinates of the farm sites. The results obtained showed an estimated carrying capacity for the investigated mariculture zone as 252,852 tons which is about 18 times the current production level of 13,500 tons that was granted in total for the sum of eight cage farms in the region with a total of 50.89-ha surface area. It can be concluded that, with the condition of periodic environmental monitoring to keep the marine ecosystem below eutrophication risk, the production capacity of farms in the designated mariculture zone, comprising a surface area of 50.89 ha, could be increased by 18-fold over the present production level, which is far below the risk threshold. The findings of this study provide important support for decision-makers in the management of intensive cage aquaculture operations in the Mediterranean region.Öğe Epibionts of mediterranean green crab, Carcinus aestuarii Nardo, 1847 in Canakkale Strait: Based on seasonal, sexual and color variation(Springer, 2024) Acar, SecilCarcinus aestuarii is representative of lagoons and is currently defined as a cosmopolitan species across different geographical regions. The objective of this study was to ascertain the species composition, prevalence, density, sex, and seasonal distribution of epibionts hosted by C. aestuarii in the Canakkale Strait. Samples of C. aestuarii were collected seasonally in Cardak Lagoon (Canakkale Strait) summer, autumn, winter, and spring using a static traditional eel trap. It was observed that the crabs were extensively colonized with bivalves, barnacles, polychaetes, and amphipods, and carried epibionts in the carapace and abdominal region. Additionally, it was observed that males exhibited a greater prevalence of epibionts than females, and that the epibiont load on the crab increased during the winter season. This study reports the first recorded instance of Anomia sp. and Sacculina carcini on C. aestuarii. The study on the invasion of the green crab is of significant importance to gain insight into the behavior, dispersal patterns, and impacts of the species. The knowledge presented here may then be utilized in the development of strategies for the management and control of invasive species, thereby contributing to the conservation of ecosystems and the maintenance of biodiversity.Öğe Evaluation of the health of Mediterranean mussels ( Mytilus galloprovincialis Lamarck, 1819) distributed in the Çanakkale strait, Turkey(Elsevier Sci Ltd, 2024) Gurkan, Mert; Gurkan, Selin Erturk; Kunili, Ibrahim Ender; Acar, Secil; Ozel, Osman Tolga; Duzgunes, Zehra Duygu; Ture, MustafaThe observation of mortality in Mediterranean mussels ( Mytilus galloprovincialis ) distributed in the & Ccedil;anakkale Strait in recent years was influential in developing the research question for this study. In this study, the presence of bacteria ( Vibrio spp.) and parasites ( Marteilia spp. and Haplosporidium spp.) in mussels collected from Kumkale, Kepez, and Umurbey stations in the & Ccedil;anakkale Strait was investigated seasonally. Microbiological findings, histopathology, oxidative stress enzymes and their gene expressions, lipid peroxidation, lysosomal membrane stability, and changes in haemolymph were examined. In summer samples, both the defence system and the extent of damage were higher in gill tissue. In winter samples, enzyme activities and lipid peroxidation were found to be predominantly higher in digestive gland tissues. Histological examinations and Hemacolor staining revealed the presence of protozoan cysts, and for bacterial examination, molecular analysis performed after culturing revealed the presence of 7 Vibrio species. While the total numbers of heterotrophic bacteria detected in all samples were at acceptable levels, the predominance of Vibrio spp. numbers among the total heterotrophic bacteria detected in almost all samples were noteworthy. The total hemocyte count was calculated as 5.810(4) +/- 0.58 (cells/mm 3 ) in winter and 7.210(4) +/- 1.03 (cells/mm 3 ) in summer. These factors are considered to be possible causes of mussel mortality.Öğe First observation of the zebra mussel (Dreissena polymorpha (Pallas, 1771)) on the narrow-clawed crayfish inhabiting in some water sources of Turkey(Ege Univ, Fac Fisheries, 2018) Berber, Selcuk; Ates, A. Suat; Acar, SecilThe zebra mussel, Dreissena polymorpha (Pallas, 1771) is considered as a harmful invasive epibiont species for hydroelectric and nuclear power plants as it reduces or blocks water flow in the plant systems. Although D. polymorpha is reported that it cleans the water, increases water visibility, and filters out pollutants, it has likewise negative impacts on the population and size of some fish and aquatic species. In the present study, zebra mussels were observed for the first time. On the narrow-clawed crayfish living in some water sources in Turkey. Specimens were collected from two natural lakes (Cildir Lake, Egirdir Lake) and five ponds (Altinyazi Dam Lake, Keban Dam Lake, Kucukcekmece Lake, Karpuzlu Dam Lake, Kadikoy Dam Lake) in Turkey. Attachments of the zebra mussel to the different body parts of the narrow-clawed crayfish were documented in the present study. Cochran's Q test results showed that the numbers of mussels clinging to the different parts of the crayfish varied (P=0.000) (P < 0.001). The difference between the holding regions of zebra mussels on crayfish specimens may cause some adverse effects on the host. Particularly the intensive grip on the carapace partially obstruct the movement, feeding, mating, avoiding predators, and shelter. mussel individuals in the pleopodal region may have difficulty holding and transporting eggs. This study is the first report about the occurrence of D. polymorpha on Astacus leptodactylus in Turkish waters.Öğe New species of freshwater molluscs from Gokceada (northeastern Aegean Sea), Turkey (Gastropoda: Hydrobiidae, Bythinellidae)(E Schweizerbartsche Verlagsbuchhandlung, 2019) Odabasi, Serpil; Odabasi, Deniz Anil; Acar, SecilFor centuries, scientists have been inspired by island ecosystems in terms of their biodiversity and physical environment. Because freshwater and terrestrial ecosystems of the Aegean Islands have undergone processes of formation and geographical isolation differentiating them from the adjacent mainland, they have attracted many scientists. Although several papers describing the freshwater molluscs of these islands have been published, there is no such study about the Turkish islands of Gokceada and Bozcaada located in the northern Aegean Sea. This study describes the diversity of the freshwater mollusc fauna of Gokceada. Sampling of freshwater snails by kick-net and hand-collection was carried out throughout the island, covering diverse habitats including fountains, streams, and artificial ponds. The findings include the first records of Dreissena polymorpha and Pisidium subtruncatum from Gokceada and the invasive gastropod Physella acuta. Furthermore, we present descriptions of the anatomy and shells of four new species of freshwater snails: Pseudamnicola cirikorum sp. n., Pseudamnicola radeae sp. n., Grossuana kayrae sp. n., and Bythinella gokceadaensis sp. n. We compare these new species (except G. kayrae sp. n.) with previously described congeners from the Sporades, mainland Greece, and western Turkey. Because Grossuana had previously not been recorded from Turkey, G. kayrae is compared with Greek and Balkan (southwestern Thrace) Grossuana species.Öğe Occurrence of the Scavenger Crustaceans Natatolana neglecta (Hansen, 1890) (Isopoda: Cirolanidae) and Scopelocheirus hopei (Costa in Hope, 1851) (Amphipoda: Scopelocheiridae) on Bento-pelagic Fish Species in the Turkish Straits System(Inst Zoology, Bas, 2022) Mulayim, Aysegul; Ates, A. Suat; Sen, Yusuf; Ozekinci, Ugur; Acar, SecilThe scavenger crustaceans Natatolana neglecta (Hansen, 1890) (Isopoda: Cirolanidae) and Scopelocheirus hopei (Costa in Hope, 1851) (Amphipoda: Scopelocheiridae), along with several other peracarid crustaceans, were recorded on demersal fish species in the Turkish Straits System. Samples were collected on (in) Raja clavata, Chelidonichthys lucerna, Trachurus sp., Scorpaena scrofa, Merluccius sp., Solea solea and Squalus acanthias captured by trammel nets at depth of 50 m on 26(th) January 2021. Natatolana neglecta, Scopelocheirus hopei and Nebalia abyssicola Ledoyer, 1997 are new for the fauna of the Turkish Straits System.Öğe POPULATION STRUCTURE, GROWTH AND REPRODUCTION CHARACTERISTICS OF THE PORTUNID CRAB, CARCINUS AESTUARII NARDO, 1847 (DECAPODA, CARCINIDAE) IN CARDAK LAGOON, TURKISH STRAITS SYSTEM(Brill, 2020) Acar, Secil; Ates, A. SuatThe aim of the present study was to determine the population structure and bioecological characteristics of the portunid crab, Carcinus aestuarii in Cardak Lagoon. In this study, the crabs were sampled by means of fyke-nets at 6 different stations between April 2015 and March 2016. A total of 2458 individuals (686 females, 1755 males, and 17 juveniles) were captured. The average carapace length was measured as 38.85 +/- 0.17 mm in females, and 47.65 +/- 0.16 mm in males. The highest number of specimens was observed in November with 239 individuals, while the lowest number (125 specimens) was observed in February. The reproductive period in both sexes was between November and February and females with eggs were found in November, February and March. An average number of eggs in a female was 61 390 +/- 8.48 and the egg diameter was 345 mu m. The female : male ratio was 0.39 : 1. This paper includes the first published data on population structure, growth, and reproduction characteristics of C. aestuarii in a protected lagoon in the Turkish Straits System.Öğe Presence of microplastics in the stomachs of Carcinus aestuarii Nardo, 1857 in Cardak Lagoon, Canakkale Strait, Turkey(Cahiers De Biologie Marine, 2018) Acar, Secil; Ates, A. SuatThis paper reports the presence of microplastic in the stomachs of the Mediterranean green crab, Carcinus aestuarii Nardo, 1857. The crabs were collected from six sites chosen in the Cardak Lagoon (Canakkale Strait). Plastic fibers were observed in the stomach contents of three male individuals. Since C. aestuarii is an important food for fish and birds in estuarine and lagoon areas, microplastics can go up to the trophic levels by entering the food chain.Öğe Presence of the Mesopodopsis slabberi (Van Beneden, 1861) (Crustacea: Mysida) from the Mediterranean Sea coast of Turkey(Ege Univ, Fac Fisheries, 2019) Ozcan, Tahir; Ates, A. Suat; Acar, SecilMysid, Mesopodopsis slabberi (Van Beneden, 1861) was for the first time recorded in Iskenderun Bay (eastern Mediterranean). A total of 10 specimens belong to M. slabberi was collected at the depths between 0 and 2 m. This paper is on the first record of M. slabberi from the Levantine coast of Turkey.Öğe Relationships between environmental variables and abundance of Cnidaria and Echinodermata in Cardak Lagoon, Canakkale Strait(Ege Univ, Fac Fisheries, 2023) Acar, Secil; Ates, Abdullah Suat; Dagli, Ertan; Dogan, AlperThis study is on the relationships between the abundances, of cnidarians and echinoderms found in Cardak Lagoon and environmental variables. The benthos samples were collected in three replicates in October 2018, February, April, and June 2019, using a metal framed quadrat system of 100 x 100 cm and 393 cm(3) sediment core by a SCUBA diver. Sediment material was collected at 7 sampling points of Cardak Lagoon in Canakkale Strait. A total of 259 individuals belonging to phylum, Cnidaria and Echinodermata were found in the study area. Cnidarian, Actinia sp. and echinoderm, Asterina gibbosa were the most dominant species. The highest positive correlation value was between Cnidaria species number and organic matter (OM%) content in the sediment. The highest negative correlation value was between Echinodermata species number and NO2+NO3 in lagoon system.Öğe The first record of Mytilus galloprovincialis (Lamarck, 1819) on Carcinus aestuarii Nardo, 1847 in the Cardak Lagoon, Turkey(Walter De Gruyter Gmbh, 2016) Acar, Secil; Ates, A. SuatThis study deals with the presence of Mytilus galloprovincialis on the Mediterranean green crab, Carcinus aestuarii Nardo, 1847 as an epibiont. Crab samples were collected by means of single-entry fyke nets at 6 different locations selected in the Cardak Lagoon. A total of 22 specimens of M. galloprovincialis (1-9 ind. per crab) on different body parts of 4 crabs were recorded. This is the first report about the occurrence of M. galloprovincialis on C. aestuarii.Öğe The Response of Apseudopsis latreillii (Milne-Edwards, 1828) (Crustacea, Tanaidacea) to Environmental Variables in the Dardanelles(Central Fisheries Research Inst, 2014) Ates, A. Suat; Katagan, Tuncer; Sezgin, Murat; Acar, SecilThe tanaid, Apseudopsis latreilli (Milne-Edwards, 1828) is a common crustacean species on the soft bottoms of the Mediterranean ecosystems and occurs in both clean and polluted environments. This study was aimed to determine the sensitive state of tanaid, A. latreillii to the environmental variables observed on the soft bottoms of the Dardanelles. A. latreillei abundance at the sites was analysed in comparision with the organic matter content in sediment and the environmental variables in the study area. A total of 1406 specimens of A. latreillii was recorded during the study. The highest dominance value (Di=30.37%) was for Kepez Harbour where the amount of organic matter was 25.50 +/- 12.09% in the sediment. The highest value of dominance according to the sampling seasons was 56.75% for Autumn 2008 (organic matter=21.7 +/- 7.99%). The highest sand rate (99.59%) in the sediment was found at the Eceabat sampling point. The highest positive correlation (r=0.349, P<0.05) was observed between gravel content (%) measured at the sites and total abundance (ind. 0.09 m-2).
