Sinop, Türkiye, Kıyısal Sarıkum Lagünü'nde Paleolimnolojik Araştırmalar

Öz

Lagünler ekosistem yönetimini zorlaştıran dinamik sistemlerdir. Paleolimnolojik yaklaşım, çevre yönetim planlarının oluşturulması için gerekli olan geçmiş uzun vadeli çevresel değişiklikleri ve referans koşullarını izlemenin tek yoludur. Burada, Kuzey Anadolu, Karadeniz kıyı düzlüğündeki Sarıkum Lagünü’nden alınan sediman karotunu göldeki geçmiş koşullar ve uzun süreli çevresel değişimi ortaya çıkarmak için, çoklu indikatör kullanılan plaeolimnolojik bir yaklaşımla araştırdık. Bunun için kuru ağırlık, organik ve karbonat karbon, klorofil a (ana diyajenetik ürünleri dahil), manyetik duyarlılık ve ostrakod analizleri yapıldı. Karotun tarihi radyonüklid tekniği ile belirlendi. Sediman kaydının yaklaşık 30’uncu cm’sinde, bütün indikatörlerde büyük bir sediman girişini, geçiş sularından gölsel çevreye geçişi ve göl biyotasının da değiştiğini gösteren ani geçişler vardır. Sedimanda korunan biyolojik indikatörler bu olaydan sonraki en geç zonun gölsel ve Karadeniz’den daha izole koşullarla temsil edildiğini düşündürmektedir. Bu olayın nedeni ne olursa olsun (deprem, su baskını vb.) Sarıkum Lagünü gölsel koşulları son 2.5 yüzyıl boyunca, bu ani olayın ardından kazanmıştır. Göl için gelecek ekosistem yönetimi ve koruma planları yapılırken bu uzun süreli çevresel değişim bilgileri dikkate alınmalıdır (örneğin, gölün Karadeniz’le bağlantısını koruyun).

Anahtar Kelimeler

• Geçiş suları
• paleolimnoloji
• çoklu-indikatör yaklaşımı
• Karadeniz
• Türkiye

Paleolimnological Investigations in Coastal Sarıkum Lagoon, Sinop, Turkey

Öz

Lagoons are dynamic systems, making ecosystem management difficult. Paleolimnological approach is the only way to track past long term environmental changes and background conditions that are essential to build environmental management plans. Here, we investigated a sediment record from Sarıkum Lagoon, on the Black Sea coastal plain in North Anatolia, through a multiproxy paleolimnological approach to reveal long term environmental change and background conditions in the lake. For which, dry weight, organic and carbonate carbon, chlorophyll a (including its main diagenetic products), magnetic susceptibility and ostracod analysis were undertaken. The core was dated via radionuclide technique. At around 30 cm of the sediment record, there are abrupt transitions in all proxies, indicating a massive sediment input, a transition from transitional water to lacustrine environment, and lake’s biota also changed. Biological proxies preserved in the sediments suggest that the latest zone, after this event, is represented by lacustrine and hydrologically more isolated conditions from the Black Sea. Whatever the reason of that event (e.g. earthquake, flood), Sarıkum Lagoon has had lacustrine conditions during the last ~ 2 and half centuries following that abrupt event. This long term environmental change information should be considered while making future ecosystem management and conservation plans for the lake. (e.g. keep the lake connected with the Black Sea).

Anahtar Kelimeler

• Transitional waters
• paleolimnoloji
• multiproxy approach
• Black Sea
• Turkey

Kaynakça

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