Hasan Örek

• Middle East Technical University

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 ammonia and phosphate) and metals. The Sea of Marmara, which also have faced large-scale mucilage outbreaks in recent years, is...

Climatic changes and interannual variability in the Mediterranean overturning circulation are crucially linked to dense water formation in the Levantine Sea, namely the Levantine Intermediate Water whose formation zone, comprising multiple and intermittent sources, extends over fluctuating pathways. To probe into the variability of this water forma...

Marker pigments are used to determine taxonomic composition and biomass of microalgae in different oceanic regions. However, sometimes discrepancies are encountered between microscopy and marker pigment based approaches principally because of altering environmental factors influencing diversity of phytoplankton. In the present investigation, marker...

The physical characteristics of water masses in the Cilician Basin were analyzed based on recent, comprehensive in‐situ data. Nine seasonal cruises from June 2015 to November 2017 were carried out in an area located in the north‐eastern Levantine Basin between the coasts of Turkey and Cyprus. In this little studied area, the structure of the water...

Son dönemde Marmara Denizi’nde yoğunlukla gözlemlenen; görsel, ekolojik ve ticari yönlerden sebep olduğu olumsuz etkileri nedeniyle kamuoyunun gündemine oturan deniz salyası sadece bugün değil geleceğimizi için de tehlike oluşturuyor. Bu bağlamda Türkiye Bilimler Akademisi Başkanlığı, konusunda uzman bilim insanları bu çevre sorununu değerlendirmel...

Marker pigments are used as a proxy for biomass of distinct phytoplankton classes in different oceanic regions. However, sometimes disagreements are observed between microscopy and accessory-pigment based approaches in distinct regions mainly due to changing environmental factors governing diversity and structure of community composition. In this s...

Reaktif metaller toplam parçacık metal havuzu içerisinde biyojeokimyasal olarak en aktif metal havuzunu temsil eder.Bu çalışmada Kilikya baseninde ilk defa bentik reaktif metal dağılımları ve arka plandaki jeokimyasal bağlam sunulmaktadır.

Here, we describe for the first time reactive iron distributions and the geochemical context in the northern basin of the EM.

This volume contains the main results of the EC FP7 “The Ocean of Tomorrow” Project CoCoNet, divided in two sections: 1) a set of guidelines to design networks of Marine Protected Areas in the Mediterranean and the Black Seas; 2) a smart wind chart that will allow evaluating the possibility of installing Offshore Wind Farms in both seas. The concep...

During the SESAME project a study was undertaken in the northern Aegean Sea and simultaneously in the Turkish Straits System (TSS). The composition and the structure of the pelagic food web were examined in order to understand the transfer of phytoplankton production up the food chain in TSS and the Aegean Sea. The results of this study confirm our...

Bio-optical measurements and sampling were carried out in the delta of the Lena River (northern Siberia, Russia) between 26 June and 4 July 2011. The aim of this study was to determine the inherent optical properties of the Lena water, i.e., absorption, attenuation, and scattering coefficients, during the period of maximum runoff. This aimed to con...

Bio-optical measurements and sampling were carried out in the delta of the Lena River (Northern Siberia, Russia) during the high water run-off period between 26 June 2011 and 4 July 2011. The aim of this study was to determine the inherent optical properties of the Lena water, i.e. absorption, attenuation and scattering coefficients, during the per...

The Mediterranean and the Black Seas are connected through Bosphorus, Marmara Sea and Dardanelles (Turkish Straits System, TSS). In this study, we examined the spatial distribution of copepods and investigate their production and grazing. The aim was to understand the transfer of phytoplankton/microzooplankton production up the food chain in TSS an...

Fethiye-Göcek region, the unique marine area having numerous calm bays for safe and enjoyable navigation, sailing and yachting is one of those Specially Protected Areas in Turkey. Göcek Bay, which has a remarkable tourism potential has became one of the most important destinations of the both Turkish and International blue voyagers. The bays of Göc...

Statistical sea surface temperature (SST) and chlorophyll a (Chl.a) maps and fields (monthly, seasonal and annual) have been prepared for the Black Sea region in the framework of the SeaDataNet project. Daily MODIS/Aqua (SST and Chl.a) and SeaWiFS (Chl.a) level 2 (L2) datasets were utilised to produce 1 km resolution final products, which are disse...

Kilikya Baseni ve Çukurova Kıta Sahanlığı kıyısal sistemi, endüstri ve nüfus artışı bakımından aşırı patlama yaşanan, insan ve doğal kaynaklı değişimlerden birinci derecede etkilenen, buna karşılık önemli ulusal kaynakları barındıran ve aynı ölçüde karmaşık atmosfer-deniz-kara etkileşimlerini içeren bir bölgedir. Karasal kaynakların beslediği kıyıs...

Over the last few decades a dramatic decline in the number of Mediterranean monk seals (Monachus monachus) limited scientific studies on the biology, behaviour, and ecology of the species. This lack of information impaired the effectiveness of conservation strategies. Thus, any further information gathered on the monk seal has utmost value in the w...

The aim of this study is to determine whether the rehabilitation of the critically endangered Mediterranean monk seal Monachus monachus in Turkey is necessary and, if so, to identify basic requirements for the establishment of a rehabilitation centre. A literature search, including grey publications on the species and its rehabilitation, was conduc...