This is the 71st annual report of the British Trust for Ornithology's Ringing Scheme, covering work carried out, and data received, in 2007.In partnership with EURING, a web-based application was developed to map migration routes of waterfowl species identified as being those with the highest potential to carry Highly Pathogenic Avian Influenza H5N1 across Europe. This application used recovery data held in the EURING database.The 25th year of Constant Effort Site (CES) ringing demonstrated how the heavy rainfall during the summer of 2007 had a largely negative effect on breeding success, with productivity of ten species significantly lower than the long-term average, although that of four species was significantly higher. These contrasting fortunes are likely to be related to the timing of the heaviest rains in relation to breeding stage. For several species, there were also continued declines in adult abundance and there is particular concern for Sedge Warbler, Reed Bunting, Lesser Whitethroat and Linnet, which reached their lowest-ever levels since CES monitoring began.Data for 96 Retrapping Adults for Survival (RAS) studies were submitted, covering 34 species, including six Red-listed species and 14 that are Amber-listed.The total number of birds ringed (786,070) was 7% lower than the mean of the previous five years. This reduction may have been influenced by the heavy rainfall in 2007, which affected breeding success of some species and may have led to fewer opportunities for ringing activities. The recovery total (13,156) was higher than the mean of the preceding five years and the number of recoveries of foreign-ringed birds (1,368) was the highest annual total ever reported. Recoveries of 223 individual birds are presented in the report. They include unexpected movements, movements that confirm suspected or known migration patterns, and longevity records. This is the 71st annual report of the Ringing Scheme of the British Trust for Ornithology (BTO). The report summarises the research carried out during 2007 using ringing data, as well as providing information on the numbers of birds ringed and the reports (recoveries) of ringed birds received. The value of ringing as a scientific tool is clearly illustrated by the wide variety of conservationrelated, pure and applied research for which it is used. The data are collected by over 2,200 volunteer ringers. By running the Ringing Scheme the BTO fulfils the duty of the UK and Irish governments (as members of the European Union) to support the study of migratory birds and maintain a ringing scheme. The BTO operates a permit system under licences from the statutory conservation agencies and ensures ringers are trained to a high standard. The BTO also administers, on behalf of the statutory conservation agencies, the licensing of ringers and nest recorders to visit the nests of birds on Schedule 1 of the Wildlife and Countryside Act (1981).Each ring has a return address and a unique number identifying every ringed bird as an individual. The species, age, sex, mea...
This is the 72nd annual report of the British Trust for Ornithology's Ringing Scheme, covering work carried out, and data received, in 2008.Research carried out in 2008 included developing methods to combine ringing data with data from other monitoring schemes to detect the causes of population change. This approach was used for Song Thrush Turdus philomelos data, confirming the findings of previous analyses that the population decline observed over the last thirty years is primarily related to first-year survival.Constant Effort Site data suggested that low productivity in 2007 contributed to reduced adult numbers during 2008 for many species, including significant decreases in Blackcap Sylvia atricapilla, Willow Warbler Phylloscopus trochilus, Blue Tit Cyanistes caeruleus and Bullfinch Pyrrhula pyrrhula. However, there were significant increases in numbers of adult Long-tailed Tits Aegithalos caudatus and Chiffchaffs Phylloscopus collybita. As in 2007, the 2008 breeding season was poor, with 11 of the 25 core species monitored by the Scheme showing significantly lower productivity compared to the long-term average . In contrast to 2007, many of the species faring worst were residents, including Blackbird Turdus merula, Song Thrush and Great Tit Parus major.Data for 92 Retrapping Adults for Survival studies were submitted, covering 34 species, more than half of which are of conservation concern. The total number of birds ringed (835,326) was 2% lower than the mean of the previous five years. This reduction may have been influenced by the poor breeding season in 2008; the total number of pulli ringed in 2008 (161,846) was 6% lower than the preceding five-year mean, while that of fully grown birds (673,480) showed no change. The recovery total (15,164) was the highest in over 15 years; however, this is partly due to changes in the way that records of colour-ringed and other specially marked birds are stored, which led to an inflation of the 2008 total. The number of recoveries of foreign-ringed birds (1,192) was higher than the mean of the preceding five years, although this figure is influenced by response times of different ringing schemes, which vary from year to year. Recoveries of 230 individual birds are presented in the final section of the report. They include unexpected movements, movements that confirm suspected or known migration patterns, and longevity records. This is the 72nd annual report of the Ringing Scheme of the British Trust for Ornithology (BTO). The report summarises the research carried out during 2008 using ringing data, as well as providing information on the numbers of birds ringed and recovered (reports of ringed birds found dead and those found alive away from the site of ringing). In addition, details of some exceptional recoveries received in 2008, and those that set new longevity records, are included in the report.Each metal ring fitted to a bird has a return address and a unique number identifying every ringed bird as an individual. The species, date and location of each bird cau...
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