Which region within the British Isles showed stable or increasing Willow Warbler populations?
Answer
Scotland and Northern Ireland
The conservation picture for the Willow Warbler within the British Isles is marked by significant regional disparity, despite the species being globally common. While populations in areas like southeast England have suffered a drastic decline, reported near 70% over the last 25 years, birds in other parts of the UK have maintained better status. Specifically, populations residing in Scotland and Northern Ireland have either remained stable or, in some instances, exhibited increases. This regional difference is thought to be connected to the varied wintering grounds utilized by northern versus southern British breeders, influencing overall demographic outcomes upon return to the breeding sites.
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