İzmir körfezi (Homa Dalyanı) sularında benzetilmiş kommünite kültür çalışması

İzmir Körfezi’nde (Ege Denizi) yer alan Homa Dalyan’ında 1998–1999 yılları arasında 12 araştırma gezisi; aylık olarak iki istasyonda gerçekleştirildi. Çevre parametrelerinden; sıcaklık, tuzluluk, çözünmüş oksijen, pH, nitrat, nitrit, amonyum, fosfat, silikat konsantrasyonları ölçüldü. Nütrient zenginleştirme denemeleri alınan su örnekleri sıcaklığı benzetilmiş ortamda (bioassay) aylık olarak gerçekleştirildi. Fitoplankton komünitesinin büyüme cevabı invivo klorofil a ölçümleriyle yapıldı ve fitoplankton büyüme hızıyla ifade edildi. Homa Dalyan’ının fitoplankton tür kompozisyonu bakımından yıl boyunca genellikle diyatomlarca zengin olduğu, bununla beraber zaman zaman da dinophycea ve ciliata üyelerinin nicel açıdan baskın olduğu gözlendi. Toksik türlere rastlanmadı ve sonuçlar çevre parametreleriyle birlikte tartışıldı. Süspanse kil minareleri içeren dalyan suyunda hücre abundansları çok düşüktü. Gelecekte mikrozooplankton otlamasının belirlenmesi; hem primer üretimin önemini hem de sürekli stokların düşük konsantrasyonlarına rağmen besin zincirine aktarılan üretimin büyüklüğünü, dolayısıyla önemini ortaya koyacağı belirtildi. Karadaki tarımsal aktivitelerin neden olduğu nutrient girişleri ile İç Körfez’den su değişimi vasıtasıyla gelen nutrientlerin belirlenmesi, bunun yanında sedimentten geçişlerin ortaya konması lagünlerde üretimin kontrolünü sağlayacağını tartışıldı.

Anahtar Kelimeler:

Türkiye, su kalitesi, fitoplankton, besin maddesi içeriği, besin maddeleri, tür çeşitliliği, besin zinciri, kıyı gölü

Simulated community culture study on wader of İzmir Bay (Homa Lagoon)

Simulated community culture study on water of Izmir Bay (Homa Lagoon). 12 monthly research expeditions were carried out at two stations of Homa Lagoon located in İzmir Bay (Aegean Sea) during 1998-1999. Among environmental parameters temperature, salinity, resolved oxygen, pH, nitrate, nitrite, ammonium, phosphate and silicate concentrations were measured. Nutrient enrichment bioassays were performed on a monthly basis under temperature conditions identical to that of the sea water samples. The growth response of the phytoplankton community was estimated through in vivo chlorophyll a measurements and expressed as phytoplankton growth rate. The phytoplanktonic species composition of Homa Lagoon was observed to be rich in diatoms however with an occasional quantitative predominance of dinophycea and ciliata members. No toxic species were encountered and the results were discussed with the environmental parameters. The cell abundances were quite low for the lagoon water containing suspense clay minerals. Further determination of microzooplankton grazing was pointed out to reveal both the significance of primer production and the extent and the importance of the production transferred to the food chain despite the low concentrations of continuous stocks. Determining the nutrient input both from terrestrial agricultural activities and from Inner Bay through water exchange and also revealing the transfers from sediments were suggested to provide management of production in lagoons.

Keywords:

Turkey, water quality, phytoplankton, nutrient content, nutrients, species diversity, food chains, lagoons,

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