Graduate School of Marine Sciences, Article

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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...
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...
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...
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...
Assessment of spatiotemporal distribution of benthic marine litter for the southern Black Sea coasts of Türkiye Dağtekin, Murat; Kasapoğlu, Nazlı; Ok, Meltem; İlhan, Salih; Büyükdeveci, Ferhat; Erik, Gökhan; Özsandikçi, Uğur; Mısır, Devrim Selim; GÜNDOĞDU, SEDAT (2025-07-01) This study investigates the prevalence and characteristics of benthic marine litter along the southeastern Black Sea coast. A two-year seasonal trawling survey (2017–2018) was conducted between Çayağzı Cape and Ünye-Taşkan...
Long-term impacts of ocean acidification on the Mediterranean mussel Mytilus galloprovincialis Kocaman, Emel; Özhan, Koray; KILIÇ, Önder; Sezer, Narin; Ibello, Valeria; Dupont, Sam; Metian, Marc; BELİVERMİŞ, Murat (2025-06-01) This study aims to elucidate the long-term physiological impacts of ocean acidification on a key seafood species. The Mediterranean mussel Mytilus galloprovincialis, was subjected to three pH conditions over a period of si...
Dissolved Organic Carbon in Coastal Waters: Global Patterns, Stocks and Environmental Physical Controls Lønborg, Christian; et. al. (2025-05-01) Dissolved organic carbon (DOC) in coastal waters is integral to biogeochemical cycling, but global and regional drivers of DOC are still uncertain. In this study we explored spatial and temporal differences in DOC concentr...
Plume Particle Ejecta Can Trace Habitat-forming Gradients in Ocean Worlds: Insights from Planet Earth Geochemistry Yücel, Mustafa; Alımlı, Nimet; Demir, Naim Yağız; CURA, HİLAL (2025-04-01) Upcoming explorations for habitability in the ocean worlds of the solar system can greatly benefit from searching beyond parameters such as water, organics, nitrogen, phosphate, and silicate and being able to detect signs ...
An electrochemical sensor integrated lab-on-a-CD system for phenylketonuria diagnostics Akyilmaz, Ipek; Celebi-Birand, Dilan; Demir, Naim Yağız; Bas, Deniz; Elbuken, Caglar; DUMAN, MEMED (2025-03-01) Phenylketonuria (PKU) is characterized by an autosomal recessive mutation in the phenylalanine hydroxylase (PAH) gene. Impaired PAH enzyme activity leads to the accumulation of phenylalanine (Phe) and its metabolites in th...
Seafloor nutrient biogeochemistry and benthic fluxes in the Northeastern Mediterranean sea Akçay, İsmail; Tuğrul, Süleyman; Yücel, Mustafa (2025-02-01) The coastal ecosystem of the Northeastern (NE) Mediterranean Sea has been affected by nutrient inputs originated from regional rivers and wastewater discharges. Sediment porewater nutrient fluxes into the deep waters are s...
Long-term monitoring and bioaccumulation of heavy metals in European anchovy (<i>Engraulis encrasicolus</i>, Linnaeus, 1758) from the Romanian Black Sea area: A risk assessment perspective Oros, Andra; Galatchi, Madalina; Akkuş, Gizem (2025-01-01) This study examines the ecological and consumer safety implications of heavy contamination in anchovy (Engraulis encrasicolus, Linnaeus 1758), one of the most widely consumed small pelagic fish in the Romanian Black Sea. L...
Single station-restricted plankton distribution and Levant occurrence of a copepod, Acartia<i> (Hypoacartia</i>) adriatica with change in P5 as compared to Adriatic and Aegean environments Duman, Guler Sila; MUTLU, ERHAN; TERBIYIK KURT, TUBA; Karaca, Dogukan; Uysal, Zahit (2025-01-01) The Mediterranean is well-known for its rich biodiversity among the semi-enclosed seas which was affected from atmospheric-sea interactions coupled with globally ocean oscillations and El Nino as well as from the basin-wis...
Sedimentation rate and chronology of Çınarcık Basin, the Marmara Sea Koraltan, İ.; Sert, İ.; Elek, N.İ.; Oluçay, B.; GÜVEN, OLGAÇ; ÖZMEN, SÜLEYMAN FATİH; Yaprak, G.; Yücel, Mustafa (2025-01-01) The Çınarcık Basin, the deepest point of the sea at 1270 m, is an important area for the accumulation and preservation of sediments and serves a natural archive for environmental change. In this study, unlike previous stud...
Historical ecosystem models can serve as a baseline for indicator-based assessment: the North Sea Saygu, İsmet; Thurstan, Ruth H.; Roberts, Callum; Heard, Zoe; Akoğlu, Ekin; Halloran, Paul R. (2025-01-01) Knowledge of past ecosystems is essential to understand how marine ecosystems have changed under human pressure. This understanding is critical for the effective management of marine ecosystems today. However, there has be...
Antioxidant Capacity and Protein contents of Five Marine Microalgae Yaman, Halil; Eker-Develi, Elif; Keles, Yuksel; Örek, Hasan; Kıdeyş, Ahmet Erkan (2025-01-01) Antioxidant capacity, chlorophyll, marker pigment, and protein contents of four diatoms (Helicotheca tamesis, Haslea silbo, Nitzschia navis-varingica, and Asterionellopsis glacialis) and one cyanobacterium (Spirulina subsa...
Allochthonous matter quality regulates functionality of lake zooplankton Yıldız, Dilvin; Yalçın, Gülce; Calderó-Pascual, Maria; Metin, Melisa; Kavak, Pınar; Dede, Cemreay; Spoljar, Maria; Gottstein, Sanja; McCarthy, Valerie; Nejstgaard, Jens Christian; Jeppesen, Erik; Ger, Kemal Ali; Beklioğlu, Meryem (2025-01-01) While numerous studies have investigated the effects of climate-induced increase of allochthonous matter (AM), the differential impacts of multiple AM sources on plankton dynamics are poorly understood. Here, we investigat...

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