THE BIRDS OF SOUTH GLOUCESTERSHIRE

 

 

Northern Willow Warbler - phylloscopus trochilus acredula

 

There are two clearly differentiated races that lie at opposite ends of the species range, the main differences between them involve size and colour. The nominate form trochilus occurring in the south-west are on average smaller and more olive-green and yellow, yakutensis occurring in the east are generally larger and more pale brown and white. The group lying in between are named acredula, but these populations are highly variable, ranging from pale olive-green and typically acredula to brown and white forms eversmannii. These two forms and many intermediates, occur sometimes side by side in the north of range of acredula.

 

 

FIRST RECORD: May 1913

EARLIEST DATE: April 16th 2013

LATEST DATE: May 1913

HIGHEST COUNT: One

 

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There have been two Northern Willow Warblers reported from S. Gloucestershire;

 

2013 (c.1)

One, a very pale individual and possibly this form, was seen at Severn View Services and Aust STW on April 16th. (David Gibbs)

 

1932 (1)

A presumed adult was ‘obtained’ sometime in April near Stoke Gifford.

 

1913 (1)

One, a presumed adult was 'obtained' sometime in May near Thornbury. This occurrence constitutes the first record of this form in S. Gloucestershire.

 

 

 

©TBOSG November 2005 - All rights reserved

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