Smew Mergellus albellus
Winter abundance change
Scarce and local winter visitor from north Fenno-Scandia/north Russia
Hide topography
Show rivers
Show woodland
Show urbanisation
Contains Ordnance Survey data © Crown copyright and database right 2013
Atlas species lists
- Breeding distribution 1995–2000
- Summer abundance 1995–2000
- Winter distribution 1995–2000
- Winter abundance 1995–2000
- Breeding distribution 2007–2012
- Summer abundance 2007–2012
- Winter distribution 2007–2012
- Winter abundance 2007–2012
- Breeding distribution change
- Summer abundance change
- Winter distribution change
- Winter abundance change
More Smew maps
- Breeding distribution 1995–2000
- Summer abundance 1995–2000
- Winter distribution 1995–2000
- Winter abundance 1995–2000
- Breeding distribution 2007–2012
- Summer abundance 2007–2012
- Winter distribution 2007–2012
- Winter abundance 2007–2012
- Breeding distribution change
- Summer abundance change
- Winter distribution change
- Winter abundance change
Map explanation
This map shows the changes which occurred in the winter relative abundance of the species between 1995-2000 and 2007-2012, but only in the limited selection of tetrads that were surveyed in winter for Birds of Wiltshire (Wiltshire Ornithological Society 2007).
Key
Relative to average
Nos tetrads
More abundant
1
<1%
Equally abundant
0
0%
Less abundant
1
<1%
Not surveyed in both periods
Smews nest mainly in the boreal taiga across northern Eurasia from northern Fenno-Scandia east to Kamchatca. In Europe the breeding range slowly contracted northwards during the 19th and 20th centuries, mainly because of habitat loss. In winter, they move mostly to the western Baltic, the Netherlands, the Black Sea and the eastern Mediterranean.
Great Britain is on the western fringe of their winter range, with small numbers found every winter in lowland regions of England, Scotland and Wales. The numbers have been in decline since the 1950s, probably because generally warmer winters have meant that winter migrants have not been travelling as far, though there have been temporary surges during cold spells.
In Wiltshire Smews were rare winter visitors before the late 1970s – there had been only 13 records prior to 1976 – but thereafter they started to appear more regularly, though there were still seven winters between 1977 and 1995 when none were recorded. Since then there have been records every winter with record totals of 19 individuals in three winters. The majority have been at the Cotswold Water Park, though they have also been recorded at a number of other sites, in particular Coate Water and Corsham Lake.
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.