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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	The population status of breeding Twite Linaria flavirostris in the UK in 2013 (2018)
Auteurs :	Nicholas I. Wilkinson, Auteur ; Mark A. Eaton, Auteur ; Kendrew Colhoun, Auteur ; Allan L. Drewitt, Auteur
Type de document :	Article
Dans :	Bird Study (65(2) June, 2018)
Article en page(s) :	174-188
Résumé :	Capsule: The second national survey of Twite Linaria flavirostris estimated a UK breeding population of 7831 pairs (95% confidence limits: 5829–10 137) in 2013.Aims: To estimate the breeding population size of Twite in the UK and constituent countries and to calculate change since the 1999 survey.Methods: Counts of Twite were made on three visits between May and July across a stratified random sample of 1-km squares in England, Scotland and Wales. In Northern Ireland, a complete census was made of the known range and adjacent 1-km squares with suitable habitat. Field surveys involved walking line transects 200 m apart and, in suitable nesting habitat, making 5-minute stops at 100 m intervals to scan and listen for Twite.Results: The UK population of Twite was estimated at 7831 pairs (95% CL: 5829–10 137). This was 21% lower but not significantly different from the 1999 survey estimate. Scotland held 98% of the UK population (7640, 95% CL: 5629–9954). There were an estimated 164 pairs (95% CL: 76–297) in England, a significant decline of 72% from 1999. Estimated totals for Wales and Northern Ireland were 16 (95% CL: 10–24) and 18 pairs respectively.Conclusion: The second national survey suggests a moderate decline in the UK Twite population since 1999 but with considerable variation between countries. Further work is required to understand the drivers of population change across breeding populations.
En ligne :	https://doi.org/10.1080/00063657.2018.1476458

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