Tez özetleri Astronomi ve Uzay Bilimleri Anabilim Dalı

Seasonal Dıstrıbutıon Of Zooplankton Groups Of Lake Küçükçekmece

Seasonal distribution of zooplankton groups of Lake Küçükçekmece was investigated for one year period between November 2005 – December 2006. In the lake, it was determined 13 species from Rotifera group, 2 species from Cladocera, 3 species from Copepoda, 4 species from Ciliata, 2 species from Polycheata, 1 species from Ctenophora and 1 species from Amphipoda group and 4 different larvae.

Indivudials of Rotifera and Cladocera belongs to freshwater while Acartia clause from Copepoda, Tintinnopsis nana, Favella sp., Strobilidium spiralis from Ciliate group, Micronereis sp., Spio sp. from Polychaeta group, Pleurobranchia pileus from Ctenophora group and Gammarus sp. from Amphipoda group as marine species were found in the lake’s zooplankton. Rotifera was dominant group for each season studied. In autumn; Bosmina longirostris, Spio sp., Pleurobranchia pileus, Cypris and Nauplius larvae of Balanus sp. and Bivalv larvae, in winter; Synchaeta pectinata, Filinia longirostris ve Epiphanes sp., in spring; Asplachna priodonta, Strobilidium spiralis, in summer; Brachionus plicatilis had higgest number of specimen. Polyarthra major, Filinia longiseta, Keratella cochlearis and Branchionus which were found in the lake are indicator species of eutrophication. Marine species, Tintinnopsis nana in second and third station peaked in number during spring while Acartia clause in third station peaked in number during summer.