Contents of report
Breeding Bird Survey
Common Birds Census
Constant Effort Sites
Nest Record Scheme
Waterways Bird Survey
Alerts
Summary
What the categories mean
Return to BTO Home Page
.
GOOSANDER Mergus merganser
 
Conservation Listings Long term trend

Unlisted/Green
Biodiversity Steering Group
Conservation Concern List

UK: Moderate increase
 
Status Summary
Goosanders first colonised the UK in the second half of the 19th century, spreading from Scotland into northern England in the 1940s (Holloway 1996). Between the two breeding atlases it expanded its range in northern England, and colonised Wales and south-west England. The WBS provides a reasonably representative coverage of the species to show its population expansion since 1980. The BTO organised two national surveys that demonstrated an average increase in population size of 3% per annum between 1987 and 1997 (Rehfisch et al. 1999). Reasons for this population increase are unknown.
 
 
Table of population changes
Source Period
(yrs)
Years Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
WBS waterways 17 1981-1998 22 66 4 215    
  10 1988-1998 26 31 -6 79    
  5 1993-1998 29 -1 -19 19    
 
Productivity information is not currently available for this species
 
   



The report should be cited as: Baillie, S.R., Crick, H.Q.P., Balmer, D.E., Bashford, R.I., Beaven, L.P., Freeman, S.N., Marchant, J.H., Noble, D.G., Raven, M.J., Siriwardena, G.M., Thewlis, R. and Wernham, C.V. (2001) Breeding Birds in the Wider Countryside: their conservation status 2000. BTO Research Report No. 252. BTO, Thetford. (http://www.bto.org/birdtrends)

[ Welcome | Contents | Introduction | CBC | WBS | BBS | Heronries | CES | NRS | Alerts ]
[ Summary | Discussion | References | Help | BTO Home Page ]

© British Trust for Ornithology
BTO, The Nunnery, Thetford, Norfolk IP24 2PU
Tel: (+44) (0) 1842 750050 Fax: (+44) (0) 1842 750030 Email:

Last updated: Last updated: 27 November, 2001

Page created by Susan Waghorn