Graduate School of Marine Sciences

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Kıdeyş, Ahmet Erkan (190)
Uysal, Zahit (128)
Salihoğlu, Barış (120)
Tuğrul, Süleyman (117)
Özkan, Korhan (114)

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Recent Submissions

First occurrence and toxic effects of Prymnesium parvum on northeastern Mediterranean harpacticoid copepod species Eker-Develi, Elif; Yurtdaş, Songül; Kıdeyş, Ahmet Erkan (2026-12-01) The ichthyotoxic haptophyte Prymnesium parvum f. patelliferum is reported for the first time in the coastal marine waters of the Mediterranean Sea, isolated from its northern Levantine Basin at a high salinity of 38 ppt. T...
Response of littoral epilithic communities to climate change: an in situ warming experiment Arıkan, Onat; Özkan, Korhan; Department of Marine Biology and Fisheries (2026-7-31) Global warming can alter the structure and functioning of aquatic ecosystems, yet the responses of benthic communities under field conditions remain poorly understood. This study developed an in situ heated settlement plat...
Convolutional Neural Networks (CNNs) improve the predictive capacity of ecosystem models in determining marine ecosystem variability under climate change in the Black Sea Akoğlu, Ekin (2026-07-07)
CARIMED (CARbon, tracers, and ancillary data In the MEDiterranean Sea): a ship-based data synthesis product - overview and quality control procedures Alvarez, Marta; et. al. (2026-07-01) The Mediterranean Sea (MedSea) is highly sensitive to climate-driven changes in temperature, oxygen, and pH, among other variables. To better assess these long-term trends, we developed CARIMED (CARbon, tracers, and ancill...
TOWARDS NEXT-GENERATION BIOGEOCHEMICAL OBSERVATIONS OF THE BLACK SEA SUBOXIC LAYER: USING HISTORICAL TRENDS TO DEFINE SENSING TECHNOLOGY NEEDS AND DEMONSTRATING AN ELECTROCHEMICAL SENSOR IN THE FIELD Ermiş, Esra; Yücel, Mustafa; Department of Oceanography (2026-6) The Black Sea hosts the world’s largest permanently anoxic basin. This study advances Black Sea oceanography by bridging the critical gap between multi- decadal historical biogeochemistry, high-resolution microsensor profi...
HYDRODYNAMIC PROCESSES AND MULTI-SITE FORMATION OF LEVANTINE INTERMEDIATE WATER IN A HIGH-RESOLUTION MODEL OF THE LEVANTINE SEA Serimozu, Cem; Salihoğlu, Barış; Başdurak, Nüvit Berkay; Department of Oceanography (2026-2-25) The Levantine Sea is a climatically sensitive and dynamically complex region of the Eastern Mediterranean, shaped by intense evaporation, steep topography, and complex circulation. It plays a key role in basin-scale thermo...
Climate Change Impact on Exchange Fluxes Across the Turkish Straits and Its Multi-Regional Implications Başdurak, Nüvit Berkay; Fach Salihoğlu, Bettina Andrea; Örek, Hasan; ACAR, AYBAR CAN; Salihoğlu, Barış; Tuğrul, Selen (2026-02-01) Straits, as conduits for the exchange of physical and biogeochemical properties of water masses, control mass and momentum transport between large water bodies where boundaries have a fundamental impact on the flow. The Tu...
DIVERSITY, POPULATION STRUCTURE, AND HOLOBIONT ORGANIZATION OF BOTRYLLID ASCIDIANS WITH A FOCUS ON BOTRYLLUS SCHLOSSERI IN RELATION TO ENVIRONMENTAL PARAMETERS ALONG TURKISH COASTS Tohumcu, Begüm Ece; Karahan, Arzu; Department of Marine Biology and Fisheries (2026-1-22) Botryllid ascidians, especially Botryllus schlosseri, are used as model organisms for studies on immune system evolution, developmental biology, and whole-body regeneration. Ecologically, botryllid ascidians, as sessile fi...
TROPHIC IMPACTS OF POISONOUS AND VENOMOUS LESSEPSIAN FISH SPECIES IN THE NORTHEASTERN LEVANTINE SEA: A COMPARATIVE FOOD-WEB MODELLING APPROACH Uysal, Aybüke; Akoğlu, Ekin; Department of Marine Biology and Fisheries (2026-1-21) The construction of the Suez Canal in 1869 permanently altered the biogeographic isolation of the Mediterranean Sea, triggering the ongoing influx of Indo-Pacific species known as Lessepsian migrants. In the Eastern Medite...
Investigation of didemnid species along the Turkish coastlines utilizing genetic, environmental, and morphological data Bekdemir, İrem; Karahan, Arzu; Department of Marine Biology and Fisheries (2026-1-16) The Didemnidae family is the most speciose and taxonomically challenging group within the class Ascidiacea (Tunicata), because of the small size of zooids and the lack of diagnostic external characters. This thesis present...
Trophic niche overlap between native and non-native fishes in central Anatolian lakes, Türkiye Ramírez-García, Arely; Korkmaz, Mustafa; Pacheco, Juan Pablo; Tavşanoğlu, Ülkü Nihan; Pita-Zamudio, Marco V.; Acar, Vildan; Aznarez, Celina; Metin, Melisa; Dede, Cemreay; Yılmaz, Gültekin; Ertuğrul, Serhat; Alves Amorım, Cıhelıo; Çolak, Mehmet Arda; Özgencil, İbrahim Kaan; Akyürek, Sevda Zuhal; Özkan, Korhan; Beklioğlu, Meryem; Jeppesen, Erik (2026-01-01) The Central Anatolian region of Türkiye exhibits exceptionally high freshwater fish diversity and endemism and is increasingly exposed to the introduction of non-native taxa. We examined the diet composition, prey selectiv...
Comparative selectivity of monofilament and multifilament gillnets for pearl mullet, Alburnus tarichi (Actinopterygii, Cypriniformes, Alburninae), in Lake Van Bozaoğlu, Adem Sezai; Akoğlu, Ekin; Ateş, Ercan (2026-01-01) Approximately 25% of annual inland capture fish production in Türkiye is from pearl mullet, Alburnus tarichi (Güldenstädt, 1814), which is an endemic species to the Lake Van Basin. Therefore, sustainable utilization of pea...
The Black Sea as an Extreme Habitat of Earth's Ocean: Biogeochemical Functioning, Unique Ecosystems, and Astrobiological Relevance Yücel, Mustafa; Bitir Soylu, Betül; Ermiş, Esra; Alımlı, Nimet; GÜLMEZ, ZERAY AYRAL (2026-01-01) The Black Sea, characterized by its unique oceanographic and biogeochemical gradients and oxygen-depleted (anoxic) waters, serves as a natural analogue of past planetary-scale geological events as well as more recent human...
Microbial and environmental interactions of the 2021 mucilage event in the Sea of Marmara Karahan, Arzu; Deliceırmak, Selin; Esti, Mertcan; Kalkan Tezcan, Evrim; Öztürk, Esra; Örek, Hasan (2026-01-01) In 2021, the Sea of Marmara (SoM) experienced an extensive mucilage event that severely impacted marine ecosystems. While nutrient enrichment, temperature anomalies, and anthropogenic stressors are known contributors to su...
Comparative assessment of eutrophication in the southern Black Sea using TRIX, BEAST, and NEAT Tan, İbrahim; Atabay, Hakan; Aslan, Ertuğrul; Mantıkcı, Asım Mustafa; TAŞKIN, ERGÜN; Kurt, Güley; Beken, Çolpan Polat (2025-12-20) This study is among the few that seek to provide an integrated assessment of eutrophication in the coastal region of the Southern Black Sea. Three methods were compared to evaluate eutrophication in the southern Black Sea ...
Changes in diversity of wetland birds across spatial scales following 20 years of wetland degradation: a case study from central Türkiye Özgencil, İbrahim Kaan; Çolak, Mehmet Arda; Yılmaz, Gültekin; Uslu, Alaz; Hasnain, Sarah; Korkmaz, Mustafa; Amorim, Cihelio Alves; Soyluer, Melisa; Beklioğlu, Meryem; Meynard, Christine; Akyürek, Zuhal; Özkan, Korhan; Jeppesen, Erik (2025-12-01) Wetlands, despite their ecological value, have been extensively degraded worldwide. This study investigates the impact of 2 decades of wetland degradation, uncontrolled water use, and warming on the taxonomic and functiona...
SALINIZATION AND WARMING EFFECTS ON ZOOPLANKTON COMMUNITY IN MEDITERRANEAN SHALLOW LAKES: A MESOCOSM EXPERIMENT Kuyumcu, Meltem; Özkan, Korhan; Department of Marine Biology and Fisheries (2025-12-1) Freshwater ecosystems in Mediterranean climate zones are increasingly impacted by climate change. Altered precipitation patterns, together with elevated evaporation rates, reduce lake water volumes and consequently increas...
Advancing Black Sea Research and Innovation to Co-Develop Blue Growth within Resilient Ecosystems Salihoğlu, Barış; Yücel, Mustafa(2025-11-30) Strengthening science-based policy in the Black Sea ; Vulnerable and unique, the Black Sea’s ecosystem services are under threat from multi-stressors such as pollution and overfishing because of climate and anthropogenic ...
COMPOSITION AND STRATIGRAPHY OF SEDIMENTARY PIGMENTS IN ALPINE LAKES OF TAURUS MOUNTAINS, TÜRKİYE Arslan, Hasan; Özkan, Korhan; Department of Marine Biology and Fisheries (2025-11-28) Anatolia features extensive mountainous regions with numerous alpine lakes, and its sedimentary records have strong potential to reveal climatic and ecological changes. Here we present the first extensive survey of the Ala...
SPATIOTEMPORAL DYNAMICS OF CARBONATE CHEMISTRY IN RIVER AND GROUNDWATER INPUTS TO THE NORTHEASTERN MEDITERRANEAN COAST Ayar, Yeşim; Özhan, Koray; Özkan, Korhan; Department of Oceanography (2025-11-12) Freshwater inputs onto coastal regions play a critical role in shaping marine carbonate chemistry, nevertheless their influence remains undefined in many semi-enclosed seas. This study presents the first comprehensive asse...

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