İzmir İç Körfezi’nde Fitoplankton Komünitesinin Pigment Kompozisyonu ve Boy Dağılımı

İzmir Körfezi uzun zamandır Akdeniz’in en kirli körfezlerinden biri durumundaydı. 2000 yılında Büyük Kanal Projesi’nin tamamlanmasından sonra körfeze atık su dejarjı önlenmiş oldu. Çalışma kapsamında aylık deniz suyu örneklemeleri gerçekleştirildi. Temel oşinografik değişkenler ve nutrientler ölçüldü. Ayrıca fitoplankton komünitesi boy gruplarına ayrılarak her boy grubunun biomasa ve pigment konsantrasyonuna katkıları değerlendirildi. Nutrient ve pigment ölçümlerine ait minimum ve maksimum değerler şu şekilde bulundu: toplam inorganik azot (TIN) için 2,20-30,22 μM ; silikat için 1,99-41,94 fosfat için μM; 0,00-5,96 μM; klorofil a için 4,93-30,26 μg $I^{-1}$, klorofil b için 0,52-33,54 μg $I^{-1}$, klorofil c için 14,71-182,66 μg $I^{-1}$ ve karotenoidler için 0,00-22,58 μg $I^{-1}$. İç körfezde nanoplankton baskın boy grubu olarak tespit edilmiştir. Körfezin dış bölgesine doğru gidildikçe pikoplanktonda artış tespit edilmiştir. Temel bileşenler analizine (PCA) göre pikoplankton pigmentleri iç körfezdeki en önemli bileşenler durumundadır.

Pigment composition and size distribution of phytoplankton community in the inner part of İzmir Bay.

İzmir Bay has been one of most polluted bays of Mediterranean for a long time. After “Big Channel Project” completed in 2000, sewage flow to the bay has been avoided. Monthly samplings of sea water were performed. Basic oceanographical variables and nutrients were measured. Besides, phytoplankton community was arrayed into size fractions to assess the contribution of each size fractions to biomass and pigment concentrations. Minimum and maximum values of nutrient concentrations and pigments were found to be 2.20-30.22 μM for total inorganic nitrogen (TIN); 1.99-41.94 μM for silicate; 0.00-5.96 μM for phosphate; 5.03-30.26 μg $I^{-1}$ for chlorophyll a, 0.52-33.54 μg $I^{-1}$ for chlorophyll b, 14.71-182.66 μg $I^{-1}$for chlorophyll c and 0.00-22.58 μg $I^{-1}$ for carotenoids. Nanoplankton were found to be dominant phytoplankton group in the inner bay. An increment of picoplankton was detected towards the outside of the bay. According to Principal component analyses (PCA), picoplankton pigments are most important components for inner bay.

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