Retention rates of glue-attached radio-transmitters on two small bird species with contrasting life histories

Abstract

Abstract Recent advances in radio-transmitter technology have produced sub-gram transmitters which allow small birds to be radio-tracked so that researchers can ascertain information on species movement and behavior to inform conservation and management plans. However, the ability to study some species remains limited by practical problems with transmitter attachment. As a result, improvements in design may be hindered by underreporting of retention rates and attachment issues. We monitored retention rates for glue-attached radio-transmitters on two bird species in southern Ontario with different life histories. Mean retention time for Chimney Swifts (Chaetura pelagica) was ≥25.1 days (± 12.8 SD, n = 12, May–Aug 2010 and 2011), while for Bobolinks (Dolichonyx oryzivorus) we estimated mean retention time at under 24 hrs (n = 15, May–Jul 2011). We discuss potential reasons for this disparity and suggest improvements to transmitters and attachment methods for short-term use on small birds where tag reten...