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Map explanation

This map shows where changes occurred in the breeding season distribution of the species in Wiltshire between 1995-2000 and 2007-2012, as revealed by the fieldwork for Birds of Wiltshire (Wiltshire Ornithological Society 2007) and the shared fieldwork for Bird Atlas 2007-2011 (BTO 2013) and for Wiltshire Tetrad Atlas 2007-2012.

Gains and improvements

Status

Nos tetrads


Absent to present

21

2%


Present to breeding

123

13%


Absent to breeding

22

2%


No change

Status

Nos tetrads


Present in both

85

9%


Breeding in both

450

49%


Losses and declines

Status

Nos tetrads


Present to absent

26

3%


Breeding to present

153

17%


Breeding to absent

18

2%


Jackdaws are found from northwest Africa eastwards across much of Eurasia to Mongolia and Kashmir. In Europe they are absent only from Iceland, northern and inland Fenno-Scandia and northernmost Russia. Most are resident though some in the northern regions migrate WSW in autumn. In other colder regions they congregate near human habitation or warmer coastal areas.
    In Great Britain they are largely sedentary. They are widespread except in Scotland where they are absent from large parts of the northwest mainland and some off-shore islands. They are most abundant south and west of a line drawn from the Wirral perinsula to Beachy Head.
    In Wiltshire they have been common and abundant at least since the mid 19th century. Birds of Wiltshire recorded them present in summer in 855 tetrads (94%) with breeding in 621, figures that were scarcely changed in WTA2 (present in 854 tetrads, breeding in 595). There were only marginal differences between the summer and winter distribution figures in either atlas.

References
The following references are used throughout these species accounts, in the abbreviated form given in quotation marks:
“1968-72 Breeding Atlas” – Sharrack, J.T.R. 1976:  The Atlas of Breeding Birds in Britain and Ireland. T. & A. Poyser
1981-84 Winter Atlas” – Lack, P.C. 1986:  The Atlas of Wintering Birds in Britain and Ireland. T. & A. Poyser
1988-91 Breeding Atlas” – Gibbons, D.W., Reid, J.B. & Chapman, R.A. 1993: The New Atlas of Breeding Birds in Britain and Ireland 1988-91. T. & A. Poyser
“Birds of Wiltshire” – Ferguson-Lees, I.J. et al. 2007 : Birds of Wiltshire, published by the tetrad atlas group of the Wiltshire Ornithological Society after mapping fieldwork 1995-2000. Wiltshire Ornithological Society.
Bird Atlas 2007-2011” – Balmer, D.E., Gillings, S., Caffrey, B.J., Swann, R.L., Downie, I.S. and Fuller, R.J. 2013: Bird Atlas 2007-2011: the Breeding and Wintering Birds of Britain and Ireland
“WTA2” – ("Wiltshire Tetrad Atlas 2 ") the present electronic publication, bringing together the Wiltshire data from “Birds of Wiltshire” and “Bird Atlas 2007-11”, together with data from further fieldwork carried out in 2011 and 2012.
"Hobby" - the annual bird report of the Wiltshire Ornithological Society.

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