Science & Research Internal Report No.137 the Effects of Colour-banding on Chatham Island Oystercatchers and Shore Plover

During a visit to Rangatira Island in 1990 we evaluated the effect of colour banding on the endangered shore plover (Thinornis novaeseelandiae) and Chatham Island oystercatcher (Haematopus chathamensis). We assessed the condition of colour bands and the cause of any band failure on 90 birds. All oystercatchers had very worn colourbands and a number of these were removed as they were likely to have brought about some discomfort to the birds. Although none of the 83 colour-banded shore plover examined appeared to have immediate problems with bands, deterioration of some bands on birds handled was noted and problems may occur in the future. Recommendations for future population monitoring and the use of colour bands are made. 1.