Graduate School of Marine Sciences

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Kıdeyş, Ahmet Erkan (189)
Uysal, Zahit (128)
Salihoğlu, Barış (119)
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Özkan, Korhan (113)

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Recent Submissions

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...
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 ...
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...
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...
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...
KÜRESEL ISINMANIN LEVANT HAVZASI'NIN HİDRODİNAMİK ÖZELLİKLERİ ÜZERİNDEKİ ETKİSİ Başdurak, Nüvit Berkay; Fach Salihoğlu, Bettina Andrea; Mantıkcı, Asım Mustafa; Örek, Hasan; Salihoğlu, Barış (2025-11-03) Son on yılda, Akdeniz, değişen iklim düzenleri nedeniyle önemli değişikliklere maruz kalmış ve bu da deniz yüzey sıcaklığının ve tuzluluğunun yanı sıra deniz seviyelerinin yükselmesine yol açmıştır. Levant Havzası, Atlanti...
Botryllus humilis: A promising new ascidian model for aging, stem cell dynamics, and whole-body regeneration Karahan, Arzu (2025-10-01) Model organisms are essential in science as they provide systems for studying conserved biological processes. In addition to widely used multicellular and unicellular models, tunicates have emerged as valuable model organi...
A Local Eddy Viscosity Parameterization for Estuarine Exchange Flow Başdurak, Nüvit Berkay; Burchard, Hans; Schuttelaars, Henk M. (2025-09-30)
Ecosystem age drives food web architecture of glacier retreat-formed fishless ponds in Greenland López-Rodríguez, Anahí; Jeppesen, Erik; Davidson, Thomas A.; Meester, Luc De; González-Bergonzoni, Iván; Vidal, Nicolás; Sommaruga, Ruben; Özkan, Korhan; Arndt, Hartmut; Jürgens, Klaus; Meerhoff, Mariana (2025-09-22) Arctic ecosystems are undergoing major changes as a result of climate change that in many cases results in habitat loss for many species. However, glacial retreat also creates new habitats, such as lakes and ponds, providi...
Fish assemblages in the trawling grounds of Northeastern Mediterranean: Comparison between the 1980s and 2020s Kurt, Merve; Gücü, Ali Cemal (2025-09-11) Since the opening of the Suez Canal, the Eastern Mediterranean has been continuously affected by the influx of non-indigenous species (NIS), leading to significant changes in species composition. In this study, we focus on...
Asexual reproduction and regenerative responses of botryllid ascidians to salinity and temperature variations Ogul Unal, Fatima Nur; Unal, Mert Koray; Karahan, Arzu (2025-09-01) The unique reproductive strategies of botryllid ascidians, which include both asexual and sexual mechanisms as well as an extensive capacity for regeneration, contribute to their fast population growth and wide-ranging eco...
MODELLING DISPERSAL AND CONNECTIVITY OF ANTARCTIC KRILL IN THE LAZAREV SEA AND ADJACENT SEAS Çağdaş, Bulut; Fach Salihoğlu, Bettina Andrea; Department of Oceanography (2025-9-1) The zooplankton species Antarctic krill, Euphausia superba, is a key organism in the Southern Ocean ecosystem that is recognized as a main component of the Antarctic marine food web. Antarctic krill is distributed all arou...
Impacts of eutrophication and deoxygenation on the sediment biogeochemistry in the Sea of Marmara Akçay, İsmail; Tuğrul, Süleyman; Örek, Hasan; Tezcan, Devrim; Özhan, Koray; Salihoğlu, Barış; Yücel, Mustafa (2025-09-01) The biogeochemistry of seafloor sediments can be significantly altered in response to deoxygenation and eutrophication-driven organic carbon production, resulting in increased benthic fluxes of dissolved nutrients (such as...
A Bathymetric And Seismic Investigation Of Submarine Landslides In The Southwestern Black Sea Şimşek, Şeval; Tezcan, Devrim; Department of Oceanography (2025-8-15) Submarine landslides are one of the important geological processes that shape the seafloor and can cause significant hazards in marine environments. This study investigates submarine landslides in the southwestern Black Se...
Seasonal and regional dynamics of carbonate chemistry and buffering capacity in contrasting marine systems: The Northeastern Mediterranean and The Sea of Marmara Alemdar, Polen; Özhan, Koray; Department of Oceanography (2025-8) This thesis investigates seasonal and spatial variability in carbonate system dynamics and buffering capacity across two contrasting semi enclosed Turkish seas: the oligotrophic Northeastern Mediterranean and the eutrophic...
ANOXYGENIC PHOTOSYNTHESIS IN THE BLACK SEA: DISTRIBUTION PATTERNS OF GREEN SULFUR BACTERIA USING PIGMENT-BASED APPROACHES Gülmez, Zeray Ayral; Yücel, Mustafa; Department of Oceanography (2025-8) Anoxygenic photosynthesis is an ancient biogeochemical pathway and a still potentially significant mechanism in some of the anoxic-sulfidic (euxinic) marine and lake ecosystems. A representative of this metabolism thrives ...
Variations in the Demersal Fishes of the Northeastern Mediterranean Over the Last 40 Years in Relation to Environmental Factors Kurt, Merve; Gücü, Ali Cemal; Department of Marine Biology and Fisheries (2025-7-04) The Mediterranean Sea has undergone substantial ecological transformations driven by climate change, overfishing, and the continuous introduction of non-indigenous species (NIS) through the Suez Canal. These stressors ofte...

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