Hasan Örek

E-mail

orekh@metu.edu.tr

Department

Graduate School of Marine Sciences

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...
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...
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...
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...
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...
INVESTIGATION OF THE EFFECTS OF MULTI-STRESSORS ON BLACK SEA BY DIATOMS AND DINOFLAGELLATE CYSTS CHANGES AT BENTHIC ECOSYSTEMS IN THE CASE OF SINOP Bitir Soylu, Betül; Örek, Hasan; Gülmez, Zeray Ayral; Alımlı, Nimet; Yücel, Mustafa (2024-10-14) The Black Sea faces environmental challenges like warming, eutrophication, and human activities. Benthic diatoms and dinoflagellate cysts are used as indicators due to their sensitivity. This study aims to assess their abu...
SPATIAL AND SEASONAL VARIATIONS IN SOUTHERN BLACK SEA PHYTOPLANKTON SIZE CLASSES Gülmez, Zeray Ayral; Örek, Hasan; Yücel, Mustafa (2024-10-14) This study investigates the spatial and seasonal variations in phytoplankton size classes across the southern Black Sea basin. HPLC pigment analysis of samples collected in December 2022 (winter) and June 2023 (summer) wil...
Karadeniz’de Birincil Üretimi Etkileyen Faktörler Mantıkcı, Asım Mustafa; Uysal, Zahit; Yücel, Mustafa; Örek, Hasan; Salihoğlu, Barış (2024-07-26)
Phosphorus build-up, nitrogen loss and sulfide accumulation in response to recent deep-water deoxygenation in the Sea of Marmara Yücel, Mustafa; Örek, Hasan; Alımlı, Nimet; Mantıkçı, Mustafa; Özhan, Koray; Fach Salihoğlu, Bettina Andrea; Tezcan, Devrim; Örek, Yeşim; Kalkan, Evrim; Arkın, Şadi Sinan; Salihoğlu, Barış (2023-07-11) The global trend of growing marine dead zones continues despite increased awareness and the development of relevant legislation, drastically changing the phosphorus cycle in the marine environment. Recent years have seen t...
MARMARA DENİZİ DİJİTAL İKİZİ VE YÖNETİM PLANI ÖNERİLERİ Salihoğlu, Barış; Yücel, Mustafa; Tezcan, Devrim; Fach Salihoğlu, Bettina Andrea; Örek, Hasan; ARKIN, ŞADİ SİNAN; Özhan, Koray; Özkan, Korhan; Mantıkcı, Asım Mustafa (2022-12-12) Son 20 yıl içinde Marmara Denizi’nin en derin bölgelerindeki oksijen değerleri ciddi azalmalar göstererek hipoksi sınırı olarak görülen 80 mikromoların altına inmiştir. Marmara Denizi üzerindeki baskı unsurları çok çeşitli...

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