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Publication - Mr Ed Drewitt

    The Colonisation of Cetti's Warblers Cettia cetti at Chew Valley Lake based on an analysis of individuals ringed during 1982 - 2006

    Citation

    Drewitt, E, 2007, ‘The Colonisation of Cetti's Warblers Cettia cetti at Chew Valley Lake based on an analysis of individuals ringed during 1982 - 2006’. Chew Valley Ringing Station, vol 15., pp. 33 - 45

    Abstract

    Ringing data has been analysed for the Cetti’s Warblers Cettia cetti captured in nets at Chew Valley Ringing Station, Chew Valley Lake from 1982 to 2006. 311 individual Cetti’s Warblers have been ringed during this period. Combined with subsequent recaptures of many of these birds, the data reveals the population peaked at 50 birds in 2003 and has steadily dropped since, assisted further by the particularly cold spell in the winter of 2005/06. Biometric data illustrates the dimorphism between male and females with regard to their wing lengths and weights as well as differences between young and adult birds. A high proportion of first year birds fail to survive into their second year and males live longer than females. The oldest Cetti’s Warbler is in its 7th year and thought to be the oldest recorded in the UK. While most Cetti’s Warblers are probably resident at Chew Valley Lake, some have moved further a field to South Wales, Kent, Somerset and Bristol. This analysis adds valuable detail to the presence of this species at Chew Valley Lake and gives a point of reference for future ringing of Cetti’s Warblers in the region.

    Full details in the University publications repository