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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, Seçil; Ertürk Gürkan, Selin; Ateş, 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) Yiğit, Murat; Ergün, Sebahattin; Büyükateş, Yeşim; Ateş, A. Suat; Özdilek, H. Göksel; Acar, SeçilThe 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 Çardak Lagünü (Çanakkale)'nde bulunan yeşil yengeç, Carcinus aestuarii Nardo, 1847'nin populasyon yapısı ve bazı biyo-ekolojik özellikleri(Çanakkale Onsekiz Mart Üniversitesi, Lisansüstü Eğitim Enstitüsü, 2018) Acar, Seçil; Ateş, SuatÇardak Lagünü'nde (Çanakkale Boğazı) yapılan mevcut çalışmanın amacı lagün alanında dağılım gösteren portunid yengeç, Carcinus aestuarii'nin populasyon yapısı ve biyo-ekolojik özelliklerini belirlemektir. Çalışmada yengeç bireyleri Nisan 2015-Mart 2016 arasında pinter avcılığıyla 6 farklı istasyondan örneklenmiştir. Toplamda 2458 birey (686 dişi, 1755 erkek ve 17 juvenil) toplanmıştır. Ortalama karapas boyu dişilerde 38,85±0,17 mm, erkeklerde 47,65±0,16 mm olarak ölçülmüştür. En fazla bireye Kasım ayı'nda (239 birey) ve en az bireye (125 birey) ise Şubat ayı'nda rastlanmıştır. Yakalanan bireylerde üreme dönemi Kasım-Şubat arasında olup, yumurtalı dişiler Kasım, Şubat ve Mart ayları'nda bulunmuştur. Dişilerde ortalama yumurta sayısı 61390±8,48 ve yumurta çapı 345µm olarak hesaplanmıştır. Dişi: erkek oranı ise 0,39:1'dir. C. aestuarii bireylerine ait toplam 533 mide incelenmiş ve 240 mide (%45) en az bir besin maddesi içerirken, 293 mide (%55) boş olarak bulunmuştur. Mide içeriklerinde en fazla yer alan besin grupları balık omuru, balık pulu, fotofil alg, yengeç (keliped, ekstremite ve yumurta), midye parçaları ve detritus'tur.Öğe Çardak Lagünü’nde pinter ile avlanan yeşil yengeç, Carcinus aestuarii’nin Nardo, 1847 birim çabadaki av miktarı(2020) Acar, Seçil; Ateş, A. SuatÇardak Lagünü’nde (Çanakkale Boğazı) yapılan bu çalışmanın amacı pinterle avlanan Yeşil Yengeç, Carcinus aestuarii ’in aylık birim çabadaki av miktarını (BÇAM) belirlemektir. Bu çalışmadayengeç örnekleri Nisan 2015-Mart 2016 arasında pinter aracılığı ile aylık olarak 6 farklı istasyondan toplanmıştır. Çalışma sonucunda toplam 686 dişi, 1755 erkek ve 17 immature birey toplamda2458 yengeç bireyi örneklenmiştir. En yüksek av verimi Ekim ayında (12.74 birey/gün), en düşükav verimi ise Şubat ayında (2.43 birey/gün) elde edilmiştir. En yüksek BÇAM değeri (10.02 birey/gün) 1. Istasyon için, en düşük (7.02 birey/gün) 6. istasyon için hesaplanmıştır.Öğe Composition of Bivalve Community in the Coastal Waters (0–4 m) of the Çanakkale Strait Along With Various Environmental Variables(2024) Yazıcı, Hazal; Ateş, A. Suat; Acar, SeçilThe present study focused on the soft bottom of the coastal waters (0-4 m) in the Çanakkale Strait. The objective was to determine the composition of bivalve species in the area. Sediment samples were collected using a 30×30 cm quadrat system by a SCUBA diver at eight sites between July 2008 and April 2009. The study recorded a total of 2299 individuals belonging to 55 species. The most abundant species in the study area was Lucinoma borealis. A significant positive correlation was found between seawater salinity and species diversity (rs = 0.59; p<0.05). The highest similarity in species diversity between seasons occurred between autumn and summer.Öğe Evaluation of isotopic signature of mucilage in the benthic food web in the Çanakkale Strait(Universitatea din Oradea, 2022) Gürkan, Selin Ertürk; Acar, Seçil; Gürkan, Mert; Özdilek, Şükran YalçinThe mucilage formation, which emerged in the Marmara Sea in November 2020, was soon seen in the Çanakkale Strait and became effective in different locations of the strait in a short time. In this study, the place of mucilage in the food web as a food source and the percentage of mucilage in the food web of warty crab (Eriphia verrucosa), which is a benthic species, was determined by the stable isotope method. For this purpose, E. verrucosa was sampled from a mucilage-affected area of the Çanakkale Strait in July 2021. In addition, sediment samples were collected to sort out macrophyte samples and macroinvertebrate samples, which could be possible food sources of the species. Finally, the pelagic and benthic mucilage samples were also taken and brought to the laboratory in the cold chain. The stable isotope analyses of all samples were made and evaluated. The results showed that mucilage from both layers joined the food web and that benthic mucilage, in particular, contributed to the diet of a benthic species, E. verrucosa. The possible contribution of mucilage, which has been determined to be included in the diet of benthic organisms with its high bacterial density, is also a concern for the diet of fish species that are consumed more frequently by humans. © 2022 Universitatea din Oradea. All rights reserved.Öğe Exotic Polychaetes of a Sewage Pollution Influenced Lagoon (cardak Lagoon, Turkish Straits)(MDPI, 2023) Dağlı, Ertan; Ateş, Abdullah Suat; Acar, Seçil; Büyükateş, Yeşim; Dogan, Alper; Bakır, Ahmet KeremThis paper includes three exotic polychaeta species, Hydroides dianthus (Verrill, 1873), Polydora cornuta Bosc, 1802, and Pseudopolydora paucibranchiata (Okuda, 1937), found during benthic samplings in Çardak Lagoon (Turkish Straits). The sampling was collected from the sandy and silty bottoms known to be polluted by sewage discharges. A total of 45 specimens of exotic polychaetes (H. dianthus: 1; P. cornuta: 4; P. paucibranchiata: 40) were found. The correlation values between the annual average values of the nutrients and the polychaeta abundance showed that the highest positive relationships with the abundance were between sand content, total phosphate, and pH. P. cornuta was the most observed species with a frequency index value of 75%, while H. dianthus was represented with a single species in the study area. Albeit the previous studies, P. paucibranchiata was observed most abundantly in the sampling station having low organic matter amounts. The study showed that opportunistic polychaetes observed in Çardak Lagoon mostly preferred organically poor sediments.Öğe Feeding ecology of portunid crab, Carcinus aestuarii Nardo, 1847 in Cardak Lagoon (The Turkish Straits System)(Ege University Faculty of Fisheries, 2021) Acar, Seçil; Ateş, A. SuatThe aim of the present study was to determine the feeding ecology of portunid crab, Carcinus aestuarii in Çardak Lagoon. For this purpose, a total of 533 crab stomachs were analyzed. Stomach contents were examined under a binocular stereomicroscope and 240 (45%) of the stomach samples were recorded as full (containing at least one food item) and 293 (55%) were recorded as empty. The occupancy rates were 25% in 127 stomachs, 50% in 69, and 100% of 44. The main diet of crab individuals was composed of fragments of fish species. Diatoms were the least consumed food by crabs. A total of 8494 diet fragments were found in the stomachs. Total stomach content was 26.39 g of fish vertebrates having the highest weight (3.58 g).Öğe First Record of the Epizoic Octolasmis angulata (Cirripedia) on Maja squinado (Herbst, 1788) (Majoidea, Crustacea) from Çanakkale, Türkiye(Çanakkale Onsekiz Mart Üniversitesi, 2022) Acar, Seçil; Şen, YusufSome morphometric and biological characteristics of a European spider crab, Maja squinado (Herbst, 1788) caught off Aksaz region, (Biga, Çanakkale, Türkiye) were investigated. In addition, an epizoic species infesting this M. squinado specimen has been identified. The crab specimen was caught by a commercial fisherman using trammel nets. Carapace length, carapace width and weight of the crab were 15.9 cm, 14.5 cm, and 1109 g respectively. The specimen was an ovigerous female with a calculated fecundity of 3.48x104 eggs. Eggs were in stage 4th of development and covered the whole carapace region. Additionaly, it was observed that the specimen was infested with the epixoic barnacle Octolasmis angulata (Aurivillius, 1894). A total of 46 O. angulata individuals were observed; 32 from the gill lamellae, and 14 from the carapace. This study reports the existence of the epizoic O. angulata on Maja squinado for the first time in Türkiye.Öğe Temporal and spatial effects of environmental variables on crustacean communities in Çardak Lagoon (Turkish Straits System) under the influence of domestic pollution(Springer Science and Business Media Deutschland GmbH, 2023) Ateş, Abdullah Suat; Mülayim, Ayşegül; Bakır, Ahmet Kerem; Acar, Seçil; Büyükateş, Yeşim; Dağlı, Ertan; Doğan, Alper; Uzundumlu, Sinan; Kedioğlu, ÇetinThis study presents the temporal and spatial effects of domestic pollution on crustacean assemblages in a protected area, Çardak Lagoon (Turkish Straits System). The samplings were performed from sandy and mud (silt + clay) bottoms between 1 and 1.8 m depths in October 2018, February, April, and June 2019. A total of 6920 specimens and 26 species (1 Isopoda, 1 Tanaidacea, 2 Mysidacea, 3 Cumacea, 5 Decapoda, 14 Amphipoda) belonging to crustaceans was found. Highest crustacea abundances were in autumn and winter. Considering the environmental variables, NO2 + NO3 (mg L− 1) and COD (mg L− 1) levels in the water had the highest correlations with abundance for the sampling periods. According to sampling points, the highest correlation value was found between anionic detergent content in the water and the abundance. Crustacean community structure was modified by environmental variables of anthropogenic origin at a higher level. Oxygen, oxygen reduction potential, NO2 + NO3, total nitrogen, chemical oxygen demand and anionic surfactant levels in water and sediment sand content % were major environmental variables affecting the crustacean abundance in the study area temporally.Öğe The community structure of Prosobranchia (Mollusca: Gastropoda) on shallow soft bottoms of the Çanakkale Strait(2017) Acar, Seçil; Ateş, A. SuatÇalışmanın amacı Çanakkale Boğazı kıyısal sularının (0-5 m) yumuşak zeminlerindeki Prosobranş kommunite yapısını belirlemekti. Bentoz örnekleri Temmuz 2008 ve Nisan 2009 tarihleri arasında bir Scuba dalıcı tarafından 30x30 cm'lik kuadrat kullanılarak mevsimsel olarak toplanmıştır. Örneklemeler Çanakkale Boğazı'nın 8 farklı istasyonun 3 transekt derinliğinde yürütülmüştür. Prosobranşlardan toplam 4472 birey kaydedilmiştir. Rissoa splendida Eichwald, 1830 sayısal olarak en baskın türdü (Di % = 20.57). Lapseki istasyonu en düşük birey sayısına (157) sahipken, Kilitbahir en yüksek (1069) birey sayısına sahipti. Spearman korelasyonuna göre en yüksek pozitif ilişki (rs = 0.75) tuzluluk ile tür sayısı arasındadır. Aksine en düşük (rs = 0.51) ilişki ise pH ile tür sayısı arasındadır. BrayCurtis benzerlik analizi yaz ve kış aylarının (88.65%) çok benzer olduğunu göstermektedir. Çanakkale ve Kilya koyu istasyonları yüksek (70.87 %) benzerliğe sahipti.Öğe The Effects of Environmental Variables and Morphometry on Hemocyte Structure in the Hemolymph of Portunid Crab, Carcinus aestuarii Nardo, 1847 in Çardak Lagoon (Çanakkale Strait)(2022) Acar, Seçil; Ateş, A. SuatThis study aims to determine the relationship between hemocyte count and hemocyte types with environmental variables and morphometric measurements in Carcinus aestuarii. A total of 240 crabs were seasonally collected in Çardak Lagoon June 2018, October 2018, February 2019, and May 2019. The average carapace length (CL) was 44.66±0.44 mm, the mean carapace width (CW) was 37.71±0.38 mm and the mean weight was 28.49±0.88 g. Crab specimens were anesthetized on ice for 10 min, and 500 µL of hemolymph was collected from the legs of each crab using a 1-mL plastic syringe. After sampling, hemolymph samples were mixed with the anticoagulant, which was applied to a Thoma slide and examined under a microscope at X40 magnification. The total hemocyte count (THC) was calculated as 13.91±8.08x106 (cells/mm3). Differential hemocyte count (DHC) 53.25±0.6% for hyalinocyte, 26.15±0.23% for semi-granulocyte, and 20.6±0.06% for granulocyte and 3 different cell types were observed. The most dominant cell type is hyalinocyte cells.Öğe The Relationship of Bristle Worm, Protodorvillea kefersteini (McIntosh, 1869) (Eunicida, Dorvilleidae) Abundance with Environmental Variables in Çardak Lagoon (Turkish Straits) Exposed to domestic Discharge(Istanbul University Faculty of Aquatic Sciences, 2024) Dağlı, Ertan; Ateş, A. Suat; Acar, Seçil; Büyükateş, YeşimThis study presents the correlations between opportunistic polychatea, Protodorvillea kefersteini (McIntosh, 1869) abundance, and environmental variables in cardak Lagoon. Samplings were carried out on the bottoms using a 30x30 cm quadrate seasonally between 1 and 1.8 m depths of seven sampling points in October 2018, February, April, and June 2019. A total of 1094 specimens belonging to P. kefersteini were collected. Environmental variables such as gravel content in sediment, pH, and salinity levels in the water had the highest correlations with the abundance through the sampling periods. Considering the sampling points, the highest correlation value was between water salinity and the abundance. Sediment gravel content, pH, salinity, temperature, anionic surfactant levels, and NO2+NO3 were major environmental variables affecting P. kefersteini abundance in the study area spatially and temporally.Öğe Zebra midyesinin (Dreissena polymorpha'nın (Pallas, 1771)) Türkiye'nin bazı su kaynaklarında yaşayan dar kıskaçlı kerevitler üzerinde ilk olarak gözlenmesi(2018) Berber, Selçuk; Ateş, A. Suat; Acar, SeçilZebra midyeleri, Dreissena polymorpha (Pallas, 1771) hidroelektrik ve nükleer güç sistemlerinde su akışını engellediğinden zararlı bir istilacı epibiont türü olarak kabul edilir. D. polymorpha suyun temizlenmesi, su görünürlüğünün arttırılması ve kirleticilerin filtrelenmesi olarak rapor edilmesine rağmen, bazı balıkların ve sucul türlerin popülasyonu ve büyüklüğü üzerinde olumsuz etkilere sahiptir. Bu çalışmada, zebra midyesi Türkiye'deki bazı su kaynaklarındaki tatlısu ıstakozu üzerinde ilk defa gözlemlenmiştir. Bireyler Türkiye'deki iki doğal göl (Çıldır Gölü, Eğirdir Gölü) ve beş göletten (Altınyazı Baraj Gölü, Keban Baraj Gölü, Küçükçekmece Gölü, Karpuzlu Baraj Gölü, Kadıköy Baraj Gölü) toplanmıştır. Bu çalışmada, kerevitlerin farklı vücut bölümlerine zebra midyesinin tutunması belgelenmiştir. Cochran's Q test sonuçları; kerevitin değişik bölümlerine tutunan midye sayılarının farklılık gösterdiğini ortaya koydu (P=0.000) (P <0.001). Zebra midyelerin tatlısu ıstakozlarının üzerinde tutunma bölgeleri arasında farklılığın tespit edilmesinin konakçı açısından bazı olumsuzluklara neden olabileceği düşünülmektedir. Özellikle carapax bölgesinde yoğun tutunmaların; hareket (beslenme, çiftleşme, predatörlerden kaçınma ve barınma). Pleopodal bölgedeki midye bireyleri ise yumurta tutunumu ve taşınımını zorlaştırabilir. Bu çalışma Türkiye sularındaki Astacus leptodactylus üzerinde Dreissena polymorpha'nın varlığı ile ilgili ilk rapordur
