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The atlas of breeding birds in Britain and Ireland

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€12,50 EUR
Normale prijs
Aanbiedingsprijs
€12,50 EUR
ISBN

Korte omschrijving 📚

The Atlas of Breeding Birds in Britain and Ireland was organised by the British Trust for Ornithology (BTO) and Irish Wildbird Conservancy (IWC) and organised by Tim Sharrock (Sharrock 1976). It was estimated that 10,000-15,000 observers contributed, resulting in dot-distribution maps with the size of dot representing levels of breeding evidence (possible, probable and confirmed). It was a giant step forward in our knowledge of the distribution of British and Irish birds.

The aim in covering a square was to record every species breeding in it during 1968?72 and, if possible, to prove breeding for each one. To this end, the main guidance given to observers was that they should visit samples of every different habitat in the square during the main breeding season of April to July, to make visits outside this period for certain species (e.g. in February or March for owls) and to make dusk and night visits for crepuscular and nocturnal species.

We were fortunate that two other national breeding bird surveys coincided or overlapped with the BTO/IWC Atlas project. First, the Wildfowl Trust’s survey of breeding and summering wildfowl in Britain, covering 1965?70, was also based on 10-km squares. Secondly, the Seabirds Group’s ‘Operation Seafarer’, the aim of which was to obtain counts and estimates of all seabirds breeding in Britain and Ireland, was carried out mainly in 1969?70.

The three grades of evidence of breeding – possible, probably and confirmed – are shown on the maps in the book as three increasing sizes of dots. The absence of a dot indicated that the species was not reported in suitable breeding habitat during the breeding seasons of 1968?72. Such blank areas will often accurately reflect the species’ absence, but this cannot be assumed, as it is only in certain cases that truly negative records can be obtained. It is usually safe to assume, however, that the species is not common in such blank square

Auteur: J.T.R Sharrock

ISBN: 903793016

1976 478pp Boards, with d.j.(browning), Index. With complete set of 12 transparent overlays of environmental factors.