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Öğe Annual Change of Marine Litter in a Rocky Area on the Coast of the Çanakkale Strait(Çanakkale Onsekiz Mart Üniversitesi, 2022) Yenici, Elif; Aslan, Herdem; Tekeli, Zeynep; Uludağ, AhmetÇanakkale Boğazı işlek bir su yolu olmasının yanında bölge insanı ve turuistlerin ziyaret ettiği önemli bir rekreasyon alanıdır. Bu çalışma, 2021 ve 2022 yıllarında Çanakkale Boğazı’nın Çanakkale şehir merkezindeki denizden doldurularak kazanılmış kayalık bir kesiminde, çöp birikiminin boyutu, çöplerin tipleri, malzeme olarak çöpün türü ve kullanım amaçlarını belirlemek için yürütülmüştür. 2021 yılında 3528 adet, 2022 yılında ise 1777 adet çöp toplanmıştır. Çöp yoğunluğu, Türkiye kıyılarında gerçekleştirilen önceki çalışmaların çoğundan çok daha yüksek bulunmuştur. En yaygın deniz çöpünü 2021'de %80,24 ve 2022'de %59,65 ile plastikler oluşturmuştur. En fazla karışık ambalaj malzemelerinin toplanması, gıda ve içecek sektöründe plastik malzemelerin çok yaygın kullanıldığını göstermiştir. Uygun çöp imha yöntemleri, biyolojik olarak parçalanabilen ambalaj malzemelerinin kullanımı, sahil temizliği ve atık yönetimi konusunda halkın bilinçlendirilmesi, özellikle kıyı bölgelerinde başarılı çöp yönetimi için kritik öneme sahiptir.Öğe Ascidianlar ve Akdeniz Havzasındaki dağılımları(2006) Aslan, HerdemBu çalışma Ege Denizi'nin kuzeydoğusunda bulunan Bozcaada kıyılarının Ascidian faunası ve bazı ekolojik özelliklerini ortaya çıkarmak için yapılmıştır. Dünya denizlerinde 2500'den fazla tür ile temsil edilen Ascidian türleri infralittoral zondan hadal zona kadar geniş bir alanda sessil olarak yaşarlar. Ülkemiz sularında dağılımları hakkında çok az bilgiye sahip olduğumuz Ascidianların Doğu Akdeniz'den 86, Batı Akdeniz'den 165 türü bilinmektedir. Bu çalışmada ise 2000-2001 yıllarında Bozcaada'nın ifralittoralinde beam trol, drej ve spatula kullanılarak altı Ascidian türü (Aplidium conicum (Olivi, 1792), Didemnum maculosum (Milne-Edwards,1841), Ascidiella aspersa (Müller, 1776), Ascidia mentula Müller, 1776, Styela plicata (Lesueur, 1823), Molgula manhattensis (De Kay, 1841)) elde edilmiştir.Öğe Ascidians and their distribution in the Mediterranean Sea(Ege Univ, 2006) Aslan, HerdemThis study was carried out elucidate Ascidian fauna and some ecological properties of shores of Bozcaada Island located in the North-east of the Aegean Sea. More than 2500 ascidians species are known to inhabit bottoms of the world's oceans. Ascidians are usually described as sessile organisms. We have little knowledge about the distribution of the Ascidians in Turkish Seas, 86 species from the Eastern Mediterranean and 165 species from the Western Mediterranean are known. In this study, samples were collected by scoop net, dredging and spatula in the infralittoral zone of Bozcaada. around Bozcaada, during the years 2000-2001. Following the taxonomic studies, six species of ascidians (Aplidium conicum (Olivi, 1792), Didemnum maculosum (Milne-Edwards, 1841), Ascidiella aspersa (Muller, 1776), Ascidia mentula Muller, 1776, Styela plicata (Lesueur, 1823), Molgula manhattensis (De Kay, 1841)) were identified.Öğe Comparing microbial communities in mucilage and seawater samples: Metagenomic insights into mucilage formation in the Marmara Sea(Springer, 2024) Gundogdu, Aycan; Nalbantoglu, Ozkan Ufuk; Karis, Gizem; Sarikaya, Ilknur; Erdogan, Meryem Nisa; Hora, Mehmet; Aslan, HerdemMarine environments are subject to various naturally occurring phenomena, including marine snow and mucilage. In 2021, the rapid emergence of mucilage in the Marmara Sea raised concerns about its environmental impact. This study investigates the microbial communities in mucilage and seawater samples from the Marmara Sea using metagenomic-scale comparative analyses. The results indicate significant differences in microbial composition and diversity, with mucilage samples showing higher levels of polysaccharide biosynthesis-related enzymes. Over 50% of reads in mucilage samples remained unclassified (dark matter), highlighting unknown microbial taxa. Clean seawater was characterized by a higher presence of Euryarchaeota, Proteobacteria, and Rhodothermaeota, while Chlamydiae and Fusobacteria were dominant in mucilage. The study underscores the necessity for comprehensive metagenomic analyses to understand microbial roles in mucilage formation and persistence. Early detection of microbial shifts could serve as a warning system for mucilage outbreaks, aiding in the development of management strategies. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.Öğe Decapod crustaceans of the coast along the Historical National Park of the Gallipoli Peninsula, Turkey(Brill Academic Publishers, 2007) Ates, A. Suat; Cirik, Sukran; Celik, E. Sanver; Akbulut, Mehmet; Aslan, HerdemDuring recent faunistic samplings, a total of 57 species of decapod crustaceans was collected in the coastal waters of the Historical National Park located on the Gallipoli Peninsula (including the northeastern Aegean Sea and Dardanelles). The samples were taken at depths ranging between W and 28 m at 10 different stations chosen along the coasts of the peninsula in July, 2005. A total of 1425 individuals belonging to 57 species was identified. The dominance of the species varies in each ecological zone; the caridean, Philocheras trispinosus (Hailstone, 1835) was commonest, with a dominance value of 13.79%.Öğe Gökçeada Salt Lake: a CaseStudy of Seasonal Dynamics of Wetland Ecological Communities in the Context of Anthropogenic Pressure and Nature Conservation(Springer, 2021) Aslan, Herdem; Elipek, Belgin; Gönülal, Onur; Baytut, Özgür; Kurt, Yusuf; İnanmaz, Özgür E.Gökçeada Salt Lake (GSL) (Gökçeada Island, North Aegean Sea) is an important wetland area situated on established bird migratory routes. The waterbody is subject to significant variability in seasonal water quality and species diversity. Monthly observations indicate that a total of 29 waterbird species were present during 2015–2016. Rainfall was observed to influence waterbird abundance. There was also a strong correlation between waterbird and zooplankton species diversity, with water quality a further influencing factor. The seasonal abundance of 78 other aquatic species was also investigated. Spring and fall seasonal eutrophication, as a consequence of canal construction and suspected warming due to climate change has caused changes in Chlorophyll-a, dissolved oxygen, biological oxygen demand levels and grazing habits of aquatic species. Here, we propose GSL as a coastal lagoon model for a hydrodynamically sensitive habitat undergoing significant change from the combined threats of heavy metal pollution from a waste management facility, pesticide use for tourism and agriculture activity and wider climate impacts. We conclude that our results provide a paradigm for broad-scale monitoring programs encompassing all components of the wetland ecosystem under anthropogenic and climate change pressure, thus providing a tool to support and inform essential management and rehabilitation plansÖğe Gökçeada Tuz Gölü Sulak Alanının Bazı Fiziko-Kimyasal Özelliklerinin Saptanması ve Biyoçeşitliliğinin İzlenmesi(2016) Aslan, Herdem; Yılmaz, Elif Can; Karabacak, Ersin; Tosunoğlu, Murat; Çamur, Belgin Elipek; Baytut, Özgür; Gönülal, OnurSulak alanlar, dogal islevleri ve ekonomik olarak yararları bakımından dünyanın en önemli ekosistemleridir. Gökçeada Tuz Gölü, yakın yerlesim alanı ve özellikle yaz aylarında artan turizm baskısı nedeniyle yeterince korunmamıstır. Bu çalısma ile Gökçeada Tuz Gölü Sulakalanın 32.34 km2 lik alanı içerisindeki göl, gölü besleyen dere, karasal alan ile zaman zaman birlestigi komsu denizin biyoçesitliligi ve fiziko-kimyasal özellikleri 2016 yılı boyunca mevsimsel olarak arastırılmıstır. Aylık yapılan kus gözlemler sayesinde özellikle flamingo gibi hassas türler hakkında birincil bilgiler elde edilmistir. Terapatik çamur olarak sunulan göl sedimentin kimyasal (agır metaller ve pestisid) ve biyolojik incelemesi, halk saglıgı için çok önemlidir. Bu çalısma sırasında göl sedimentin pestisit ve agır metal (Pb, Co, Cd, Ni, Fe, Mn, Cr, Mg, Ca, Cu, Al, Na, K, P, Ba, Zn) degerleri ile su sütununun sıcaklık, tuzluluk, iletkenlik, pH, DO, klorofil-a, BOD, KOI, askıda katı madde ve toplam organik karbon degerleri ölçülmüstür. Tuz Gölü Sulakalan?nın karasal, denizel ve göl ekosistemlerinin örneklenmesi sonucunda, karasal floraya ait 194 tür, sucul floraya ait toplam 134 tür (97 tür fitoplankton, 37 tür bentik alg); 14 tür sürüngen, 3 tür kurbaga ve 71 kus türü saptanmıstır. Göl faunasına ait 23 makrobenthos türü, denizel ortama ait ise toplam 135 tür saptanmıstır. Flamingo popülasyonun aylık olarak 0-965 birey arasında degistigi belirlenmistir. Çalısma sonucunda gölde pestisid ve agır metalin bulundugu ve su kalitesinin düsük oldugu saptanmıstır. Özellikle göl dip çamurun insan saglıgı için zararlı olabilecegi ve turizm amaçlı olarak kullanılmaması gerektigi sonucuna varılmıstır. Bölgenin bilimsel olarak izlenmesinin devam etmesi ve sulakalanlar ile ilgili yasakların bölgede uygulanabilmesi için denetimlerin artırılması gerekmektedir. Elde edilen veriler, sulak alanın sürdürülebilir kullanımı için eylem planında kullanılacaktır.Öğe Identification of benthic habitat types of the Canakkale Strait coast using the European Nature Information System and the Barcelona Convention habitat classification schemes(Trakya Univ Balkan Yerlesesi Enstituler Binasi, 2024) Tekeli, Zeynep; Aslan, HerdemThe Canakkale Strait is important in terms of its location within the Turkish Straits System and its biodiversity. Since it is a Special Environmental Protection Area (SEPA), it is important to determine the existing habitat types. Although the use of European Nature Information System (EUNIS) and Barcelona Convention (BC) habitat classification systems in marine habitat studies has just begun in T & uuml;rkiye, studies using these systems have been carried out inAnumerous countries over many years. This study aimed to identify habitat types in the supra-, medio- and upper infralittoral (d own to 0.5 m depth) zones of the Canakkale Strait, in accordance with the EUNIS and the BC classifications. The SACFOR abundance scale was applied to zoo- and phytobenthic species in determining these habitat types. Field studies were carried out in soft and hard substrate areas at 16 stations between May and August 2019. AFourteen marine benthic habitat types have been determined using EUNIS and 12 using the BC systems from rock, biogenic, coarse and sand sediment types. No statistically significant difference (p > 0.05) Awas found between the benthic marine habitat types determined for the supra- and upper infralittoral zones according to BC and EUNIS. On the contrary, in the mediolittoral zone, a statistically low significant difference was found between habitat types for both habitat classification systems (R = 0.318, p = 0.004 for EUNIS; R = 0.514, p = 0.001 for BC). In this study, the differences and similarities of habitat types in defined EUNIS and BC systems are discussed. The EUNIS habitat classification system was found to be more representative than BC of the studied area, but both classification systems were found to be insufficient for the Eastern Mediterranean littoral communities and aAnew habitat hierarchy is needed. We present this study as a paradigm for future application to marine habitat studies to be carried out in Turkish waters.Öğe Mollusc Diversity of Hard Substrate Habitats of Gökçeada Island(2023) Tekeli, Zeynep; Aslan, Herdem; Bali, AyşegülIn the present study, molluscs diversity between 0-0.5 m depths of the hard substrate habitats of Gökçeada coasts was investigated qualitatively and quantitatively, seasonally, and monthly in 2010 and 2011. In addition, in summer months of 2021, samples were taken to investigate the mucilage impact on the mollusc fauna, which occurred in the Marmara Sea in 2021 and affected Gökçeada coasts due to the currents. A total of 76 mollusc species were identified and 27 of the determined species are new records for Gökçeada. Among the found species, while Cardita calyculata (Linnaeus, 1758) was the most dominant species at the Yıldız Koy station sampled monthly, Musculus costulatus (Risso, 1826) was the dominant one at all other sampling stations. The Tepeköy station was found to has the highest number of species and individuals. As the main reason for this can be indicate the limited human access to the region and the presence of various habitats. Mollusc species diversity, which was detected in 2010 due to the pouring of sand for tourists by the municipality at Yıldız Koy station, was found to be increased greatly in 2021 after this practice was abandoned. It was also detected that the mollusc species distributed on the coasts of Gökçeada were not acutely affected by the mucilage event occurred in 2021. However, more detailed studies need to be monitoring and report the negative effects that may occur the mucilage event on the species diversity of the region in the coming years.Öğe On the discovery of Crithe cossinea T. Cossignani, 1997, a new marine alien species for the Mediterranean Sea, with additions and remarks on 15 unreported molluscan species from Turkey coast(Cahiers De Biologie Marine, 2017) Aslan, Herdem; Ovalis, PanayotisThe whole molluscan assemblages along the Turkish coasts of the Aegean Sea and the Levantine Sea (Southern Turkish coasts), were studied from 20 stations at depths ranging from 11 m to 69 m, between August and October 2014. This has resulted in new contribution to Mediterranean marine molluscan fauna. Crithe cossinea is a new lessepsian for the Mediterranean Sea, five Gastropoda (Melanella alba, Mangelia callosa, Mangelia tenuicosta, Clathromangelia loiselieri, Raphitoma bicolor) are new records for Turkish Seas, two Gastropoda (Ondina obliqua, Retusa nitidula) are new records for the Aegean Sea while another two Gastropoda (Alvania hispidula, Vexillum hypatiae) are new records for the Turkish coast of the Aegean Sea and four Gastropoda (Cerithiopsis fayalensis, Bela menkhorsti, Raphitoma aequalis, and the alien species Monotygma fulva) are new records for the Turkish coasts of Levantine Sea. Among Bivalvia species, Thyasira alleni is a new record for both seas and Pitar mediterraneus is a new record for the Turkish coasts of Levantine Sea. The present study contributes to molluscan fauna of Turkish waters by the addition of six more species, increasing their number to 1076.Öğe Peracarid Crusteceans Species from Upper Infralittoral Rocky Shores of Gokceada Island (Aegean Sea)(Çanakkale Onsekiz Mart Üniversitesi, 2019) Aslan, Herdem; İşmen, PınarThe abundance of the peracarid crustacean fauna were studied on a spatial scale of Gokceada Island which is located Northern Aegean Sea. Samples were collected seasonally from 13 coastal stations at depth 0.1- 0.5 m, during years of 2010 and 2011. The surface was scraped by means 20 x 20 cm quadrats and sieving 0.5 mm mesh size. Result of identified and counting all peracarid species, a total of 142,906 individuals/m2 were obtained belonging to 88 species and 66 of them were new record for the island’s fauna. Amphipods were the dominant group both in terms of species Margalef richness and abundance. Ampithoe ramondi, Hyale schmidti and Elasmopus brasiliensis were the most abundant species. Number of species, density, richness, evenness, diversity of stations and similarity are also discussed.Öğe Spatial Variation Ecological Quality Assessment of Live and Dead Molluscan Assemblages in the Aegean Sea(Korea Inst Ocean Science & Technology-Kiost, 2023) Aslan, Herdem; Ovalis, PanayotisFor accurate estimation and correct identification of species of EcoQS for macrozoobenthos in MSFD, the distinction between dead and living molluscan specimens is significant. In this study, EcoQS values of Turkish Aegean Sea coasts were calculated separately based on live and dead + live molluscan communities using Shannon-Wiener Indices, Bentix, AMBI, M-AMBI and TUBI biotic indices. A total of 219 mollusks species and 76,170 ind.m(-2) were found but only 57 species and 2227 ind.m(-2) of them were encountered as live and 2 species (Turbonilla sinuosa and Alvania zaraensis) of dead individuals were identified as new records for the Turkish coasts. Stations with rare live molluscan species numbers have lower ecological qualities than the indices made with dead + live. However, in the presence of opportunistic species among dead + living species, the situation is reversed. In this study, we discuss the results of the aggregation of dead molluscan individuals, and the differences and correlations between the indices according to the different molluscan data sets. Thanks to the aggregation of dead molluscan individuals obtained in the sampling area, information about the anthropogenic disturbances in the recent past can be obtained. While there is a correlation between EcoQS of indices of the dead + live mollusk species, this correlation is not found in only living individuals. Also a similarity was found between M-AMBI and TUBI, which used the Shannon-Wiener index in their calculation.Öğe Spatial Variation of Soft Bottom Arthropoda and Echinodermata Fauna in the Aegean Sea(Central Fisheries Research Inst, 2024) Aslan, HerdemA study was conducted on the community of the arthropod and echinoderm fauna in the Aegean Sea of Turkish coast between August 12th and 19th, 2014. Sampling was obtained utilizing a van Veen grab at 16 stations between Edirne-Enez and Marmaris by the R/V TUBITAK Marmara at depths ranging from 11.5 to 69 m. In the study area, an average of 79 individuals m-2 of 68 arthropod species with an average weight of 1.3 g m-2; a total density of 18 individuals m-2 of 13 echinoderm species with a weight of 22 g m-2 were obtained. Amphipod Gammaropsis sophiae and ophiuroid Amphiura cherbonnieri are new record species for the Aegean coast of Turkiye. The frequency index indicates that tanaid Apseudopsis latreillii and Ophiroid Amphipholis squamata are the most common taxa. The quantitative dominance results for all study areas demonstrate that tanaid Chondrochelia savignyi and ophiroid Amphiura chiajei were the most dominant species. The highest number of species (33 species), abundance (373 ind m-2) and biomass (247 g m-2) were found in the station & Ccedil;e & scedil;me while no species could be obtained at station outer Izmir Bay. In the implementation of ecosystembased management strategies, the presentation of qualitative and quantitative information regarding fauna is of great importanceÖğe SPECIES DIVERSITY IN LENTIC, LOTIC, MARINE AND TERRESTRIAL BIOTOPES OF GOKCEADA SALT LAKE WETLAND (CANAKKALE, TURKEY)(Parlar Scientific Publications (P S P), 2018) Aslan, Herdem; Gonulal, Onur; Can-Yilmaz, Elif; Elipek, Belgin; Baytut, Ozgur; Tosunoğlu, Murat; Karabacak, ErsinThis study was carried out to provide detailed information on species diversity and community structure of Gokceada Salt Lake Wetland (brook feeding the lake, neighboring sea and terrestrial area around the wetland). Aquatic species diversity (algae, invertebrates, and fish) at 9 different stations in freshwater, brackish water and marine ecosystems, and terrestrial species diversity (plants, amphibians, reptiles, birds and mammals) in the surrounding wetland were studied seasonally in 2016. A total of 195 taxa of terrestrial vascular flora and 134 species of aquatic flora (97 species of phytoplankton, 37 species of benthic algae); a total of 23 macrobenthic invertebrate taxa from the lake and 131 invertebrate species from the sea were identified. Also, 4 fish, 14 reptiles, 3 amphibians and 71 bird species were observed in the study area. While one species of phytoplankton was determined as a new record for the Turkish aquatic flora, a total of 71 marine invertebrate species were reported for the first time in the marine fauna of Gokceada. The obtained data will not only provide a solid basis to expand the understanding of the island's ecosystem, but also will serve as an important tool in the action plans for wetland conservation.Öğe Temporal trends in personal protective equipment (PPE) debris during the COVID-19 pandemic in canakkale (Turkey)(Elsevier, 2023) Aslan, Herdem; Yilmaz, Okan; Benfield, Mark C.; Becan, S. AhmetThis study examines trends in PPE (masks, gloves) and disinfecting wipes over three years of the pandemic. The densities of discarded masks, wet wipes, and gloves (personal protective equipment: PPE), were quantified on the streets of Canakkale, Turkey during similar time periods in 2020, 2021 and 2022. Geotagged images of PPE on the streets and sidewalks were documented with a smartphone, while the track of an observer was recorded using a fitness tracker app along a 7.777 km long survey route in the city center, parallel to the Dardanelles Strait. A total of 18 surveys were conducted over three years, and the survey route was subdivided into three zones based on utilization patterns: pedestrian zone, traffic zone and a recreational park zone. The combined densities of all types of PPE density were high in 2020, lower in 2021 and highest in 2022. The within year trend showed an increase over the three study years. The average density of gloves declined from an initially high level in 2020, when the SARS-CoV-2 virus was thought to be transmitted by contact, to near zero in 2021 and to zero in 2022. Densities of wipes were similar in 2020 and 2021 and higher in 2022. Masks were initially difficult to procure in 2020, and their densities progressively increased during that year reaching a plateau in 2021 with similar densities in 2022. PPE densities were significantly lower in the pedestrian route relative to the traffic and park routes, which were not different from each other. The partial curfews implemented by the Turkish government and the effects of prevention measures taken on the PPE concentration in the streets are discussed along with the importance of waste management practices.Öğe Trophic ecology of the Atlantic blue crab Callinectes sapidus as an invasive non-native species in the Aegean Sea(Springer, 2021) Aslan, Herdem; Polito, Michael J.Invasive non-native crustaceans are a biodiversity and management concern in the Mediterranean Sea. The Atlantic blue crab (Callinectes sapidus) was first recorded in the Mediterranean Sea in 1949, but may have arrived as early as in the 1930's. Blue crabs in the Mediterranean Sea are of concern due to their presumed potential for negative consumptive and competitive interactions with native fauna. The aim of this study was to provide a first assessment of the trophic ecology of non-native blue crab in the Northern Aegean Sea using stable carbon (delta C-13) and nitrogen isotope (delta N-15) analysis. We found limited isotopic niche overlap between blue crabs and seven native species examined at Gokceada Island in April, June, and August of 2017. In addition, the range of calculated trophic positions of blue crabs at Gokceada Island (2.0 to 4.4), while broad, is in general agreement with prior studies in both native and non-native ranges. We also observe that trophic position declined and the relative importance of pelagic carbon sources to blue crabs increased from April to August. However, we also found that differing assumptions as to the number and type of food web baselines and trophic discrimination factors led to differing estimates of trophic position in blue crabs at Gokceada Island by as much as one to two trophic levels. These methodical differences make it challenging to directly compare results within and between studies, and thus limit our ability to assess negative consumptive and competitive interactions of invasive blue crab with native coastal species in the Mediterranean Sea.Öğe Zonation in littoral macrobenthic assemblages in the Çanakkale Strait (Dardanelles)(Springer Heidelberg, 2023) Tekeli, Zeynep; Aslan, HerdemThis study presents an assessment of the benthic community structure in the supra-, medio-, and upper infralittoral zones along the canakkale Strait, Turkey. Replicated samples were collected with cores and quadrats from 16 stations during the summer months of 2019. The average density of zoobenthos was estimated at 20,626 individuals m-2 and average wet mass of phytobenthos was 652 g m-2. In total, the community comprised 160 zoobenthic and 35 phytobenthic species. Nine species were new records for the Turkish Strait System, and five were non-native to the area. The study revealed that Oligochaeta (sp.) were the dominant zoobenthos taxa, followed by the amphipod species Speziorchestia stephenseni (Cecchini, 1928). Additionally, the red alga Ceramium virgatum Roth, 1797 was identified as the most abundant phytobenthic taxon. No statistically significant differences were found in the biomass of the phytobenthic and the abundances of the zoobenthic assemblages among the supra-, medio-, and infralittoral zones, only zoobenthos community have a weak but significant difference with soft and hard substrates. Furthermore, a statistically significant but weak relationship between zoo- and phytobenthic species is also reported. The study also examined correlations between abiotic properties on community structure. It was revealed that the sediment in the structure of medium gravel, fine gravel, and fine sand affected the structure of the benthic community in the three zones. Also, the distance of the sampling area to the zone boundaries affects the distribution of zoobenthic communities in the medio- and infralittoral zones. The findings of this study offer fundamental data for the development of ecosystem-based marine management plans and extensive monitoring programs for the coastlines of the canakkale Strait. This area serves as the biological corridor of the Marmara Sea, which was designated as a Special Environmental Protection Area (SEPA) in 2021, facing pressures from anthropogenic activities and climate change.
