Nutrients in Sediment and Overlying Water in the Homa Lagoon of İzmir Bay (Aegean Sea, Turkey)

Abstract

Benthic fluxes of biogenic compounds play a critical role in the biogeochemistry of shallow aquatic ecosystems. Measuring these fluxes at the lagoon scale is challenging due to heterogeneous sediment structures and the combination of diffusion and advective transport processes at the sediment-water interface. In this study, monthly nutrient flux experiments were conducted in the sediment of İzmir Bay Homa Lagoon (Aegean Sea, Turkey). The flux of reactive silicate (RSi) ranged from 14.6 to 255.24 μgatSi/m²/hour, while the ammonium (NH4+) flux varied between 3.59 and 95.8 μgatN/m²/hour. The nitrite (NO2-) flux ranged from 0.93 to 13.99 μgatN/m²/hour, and the nitrate (NO3-) flux varied from 27.76 to 300 μgatN/m²/hour. The flux of reactive phosphorus (RP) ranged from 0.74 to 5.80 μgatP/m²/hour. The research indicated that the RSi flux peaked during the summer months, while the NO3- flux occurred in both winter and summer, transferring nutrients from sediment to water and vice versa. It was determined that the NO2- flux significantly transferred to the sediment, except during the summer months. The RP flux flowed from sediment to water during the summer, while it was bound to the sediment during mid-winter and autumn. The NH4+ flux showed transitions from sediment to water in winter and from water to sediment in summer. In conclusion, the fluxes of NO3-, NH4+, and RP indicate that these components are sediment-derived.

Keywords

• İzmir Bay
• Homa Lagoon (Aegean Sea
• Türkiye)
• Nutrient flux
• Pore water
• Sediment

İzmir Körfezi Homa Lagünü’nde Sediment ve Sediment Üstü Suda Nutrientler (Ege Denizi, Türkiye)

Abstract

Biyojenik bileşiklerin bentik akışları, sığ su ekosistemlerinin biyojeokimyasında kritik bir rol oynar. Bentik akışların lagün ölçeğinde ölçülmesi, heterojen sediment yapıları ve sediment su arayüzündeki difüzyon ile advektif taşıma süreçlerinin birleşimi nedeniyle zordur. Bu çalışmada, İzmir Körfezi Homa Dalyan’ı (Ege Denizi, Türkiye) sedimentinde aylık nutrient akış denemeleri gerçekleştirilmiştir. Reaktif silikat (RSi) akışı 14.6 ile 255.24 μgatSi/m²/saat arasında, amonyum (NH4+) akışı 3.59 ile 95.8 μgatN/m²/saat arasında, nitrit (NO2-) akışı 0.93 ile 13.99 μgatN/m²/saat arasında, nitrat (NO3-) akışı 27.76 ile 300 μgatN/m²/saat arasında, reaktif fosfat (RP) akışı 0.74 ile 5.80 μgatP/m²/saat arasında değişim göstermiştir. Araştırma, RSi akışının yaz aylarında maksimum seviyeye ulaştığını, NO3- akışının kış ve yaz dönemlerinde hem sedimentten suya hem de sudan sedimente gerçekleştiğini ortaya koymuştur. NO2- akışının yaz dışında önemli ölçüde sedimente geçtiği belirlenmiştir. RP, yaz aylarında sedimentten suya geçerken, kış ortası ve sonbaharda sedimente bağlanmıştır. NH4+, kış aylarında hem sedimentten suya hem de sudan sedimente akış yaparken yaz aylarında sudan sedimente akış göstermektedir. Sonuç olarak NO3-, NH4+ ve RP'nin sedimentten su kolonuna doğru akışı, bu bileşenlerin sediment kökenli olduğunu göstermektedir.

Keywords

• İzmir Körfezi
• Homa Dalyan’ı (Ege Denizi
• Türkiye)
• Nutrient akışı
• Pore suyu
• Sediment

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