H. Vedat AKER, İsmet ÖZEL

İzmir Körfezi kladoserlerinde mevsimsel dağılım

İzmir Körfezi kladoserierinin mevsimsel dağılımlarını saptamak amacıyla 2004-2005 yıllarında bu çalışma gerçekleştirilmiştir. Örnekler, altı istasyondan 200 pm ağ göz açıklığı olan Unesco WP2 tip standart zooplankton kepçesi kullanılarak, dipten yüzeye kadar yapılan vertikal çekimlerle toplanmıştır. Örneklerin değerlendirilmesi sonucunda Penilia avirostris, Evadne spinifera, E. tergestina, E. nordmanni, Podon polyphemoides ve P. intermedius olmak üzere toplam altı kladoser türü tespit edilmiştir. P. avirostris, E. spinifera ve E. tergestina türleri ilkbahar ve özellikle yaz mevsiminde en yüksek bolluk oranlarına ulaşmaları ve yaygın dağılım göstermelerinden dolayı en önemli türlerdir. E. nordmanni yaz mevsimi hariç olmak diğer mevsimlerde, P.intermedius ve P. polyphemoides türleri ise tüm mevsimlerde değişen bolluk oranlarında dağılım göstermektedirler.

Anahtar Kelimeler:

mevsimler, Türkiye, sucul topluluklar, zoocoğrafya, İzmir, Cladocera, zooplankton

Seasonal distribution of Cladocerans in İzmir Bay

In order to determine the seasonal distribution of cladocerans in Izmir Bay, this study was carried out in 2004-2005. Samples were collected from six stations by vertical hauls through integrated water columns (0 m. -bottom) using a WP2 zooplankton net with a mesh size of 200 [im. Totally six Cladocera species were identified in plankton material collected from Izmir Bay; Penilia avirostris Dana, Evadne spinifera Muller, E. tergestina Clauss, E. nordmanni Loven, Podon polyphemoides Leuckart, and P. intenvedius Lilljeborg. P. avirostris, E. spinifera and E. tergestina were the most important species due to they were dominant and the commonest forms in spring and particularly in summer in this area. E. nordmanni was found in small numbers in all seasons, except in summer. P.intermedius and P. polyphemoides could be characterized as frequent forms.

Keywords:

seasons, Turkey, aquatic communities, zoogeography, Izmir, Cladocera, zooplankton,

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