ABSTRACT Reverse migration is a popular concept, often used to explain the occurrence of autumn vagrants.The term `reverse migration shadow’ has been used to identify regions in which autumn vagrancy of a given species may occur, and to predict potential future vagrants to Britain. In this paper, we evaluate this theory and, by analysing vagrancy patterns, demonstrate that autumn vagrancy is not limited to the `shadow’ of a 180° route-reversal. Although the vast majority of individuals follow a traditional route to winter quarters, vagrancy during autumn migration occurs in all directions, and we contend that it is the pattern of observer coverage which determines the number of vagrants discovered.The occurrence patterns of some vagrants reaching Britain can be explained using the idea of long-range dispersal. We suggest that some comparatively regular vagrants reaching Britain are, in fact, performing annual migrations to presently undiscovered wintering grounds in western Europe or West Africa.In the river valleys and on the low, densely forested hills, Leopards Panthera pardus stalk through the undergrowth, and the beautiful Asian Paradise Flycatchers Terpsiphone paradisi flit restlessly among the branches… Higher up the mountains, the bright southern birds are left behind in an enchanting sea of sounds, scents and colours. In their place stands the more solemn but equally beautiful world of the coniferous taiga, where the cool silence is perhaps broken only by the simple but sweet song of a Pallas’s Warbler Phylloscopus proregulus. (Algirdas Knystautas 1987)allas’s Leaf Warbler Phylloscopus proregulus is a bird of the vast boreal
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British Birds – how it works
BB 2000 Ltd, the company that owns and publishes British Birds, is run by a board of directors, all of whom are volunteers. The company employs two full time staff – Roger Riddington is the journal’s editor while Hazel Jenner manages subscriptions and administration – and three part-time design/editorial staff.
The company is wholly owned by The British Birds Charitable Trust (BBCT, registered charity no. 1089422). Neither the company directors nor the trustees are paid for their services, providing their time and enthusiasm because they passionately believe in the value of BB. The Company is managed with a view to making a small profit which can be donated to the Trust to help fund its charitable work.
Over the past six years, this, combined with donations from other sources, has enabled the Trust to give almost £40,000 support to a variety of conservation and educational projects ranging from rat eradication on seabird islands to the study of cuckoo migration, as well as assisting young birders develop their interest.
A full list of projects is given here. The Trust is seeking to expand its charitable endeavours and would welcome donations from like-minded organisations and individuals.