Gölköy ve Yumrukaya'nın sucul bitki çeşitliliği(Bolu,Türkiye)

In this thesis vascular aquatic macrophyte flora of Lake Gölköy and Yumrukaya wetland (Bolu, Turkey) were studied. Field studies were done between July and November for 2011, between April and October for 2012. After identification of the collected specimens 80 taxa belonging to 30 families and 50 genera were found. 8 taxa are new records for the Bolu province. The largest 5 families according to their species number in the two study areas are: Cyperaceae (11 sp.), Lamiaceae (8 sp.), Potamogetonaceae (6 sp.), Asteraceae (5 sp.) and Ranunculaceae (5 sp.). The largest 5 genera according to their species number in the two study areas are: Carex (5 sp.), Potamogeton (5 sp.), Salix (5 sp.), Juncus (4 sp.) and Polygonum (4 sp.). Identified aquatic plants were also classified according to their life forms, as being submerged, free floating, attached floating or as emergent. The study sites were compared with 5 other wetland of Bolu according to their species compositions. TWINSPAN two-way indicator species analyze resulted in four groups. Non-metric multidimensional scaling (NMDS) analysis separated Gölcük, Sülüklügöl and Lake Sünnet from the cluster formed by Lake Gölköy, Yumrukaya, Abant and Yeniçağa. Keywords: Bolu, Gölköy, Macrophyte, NMDS, TWINSPAN, Yumrukaya.