Canadian Light-bellied Brent Goose
Branta bernicla hrota
The East Canadian High Arctic (ECHA) population of Light-bellied Brent Goose breeds in Canada and winters almost entirely in Ireland, with smaller numbers in Britain, the Channel Islands and the north coasts of France and Spain.
It undertakes one of the longest migrations of any Western Palearctic goose population, crossing the Greenland ice-cap, staging at sites in Greenland and Iceland before crossing the North Atlantic to Ireland.
Strangford Lough in Northern Ireland hosts over 75% of the population during the late autumn and is by far the most important site for this species outside the breeding season.
Global status (IUCN Red List of Threatened Species) Least Concern* African-Eurasian Waterbird Agreement (AEWA) A3a; International Single Species Action Plan European status (European Red List of Birds) Least Concern (Europe and EU27)* The Birds Directive (European Commission) Annex II (Part B) UK status (Birds of Conservation Concern) Amber UK quarry species (Wildlife & Countryside Act 1981) not huntable * assessed at species level Brent Goose Branta Bernicla
Flyway population size (CSR 7; Wetlands International 2015) 36,500 individuals UK estimate (APEP 4) 31,000 individuals GB estimate (Frost et al. 2019) 1,600 individuals All-Ireland estimate (Burke et al. 2018) 35,150 individuals UK trend (Frost et al. 2020) 25-year trend (1992/93-2017/18) = 61% increase
10-year trend (2007/08-2017/18) = 7% increase
Table 1. Annual estimates of the population size, percentage of young (%) and mean brood size (young per successful pair) of East Canadian High Arctic Light-bellied Brent Goose, 2003/04-2017/18; recorded during the All-Ireland Light-bellied Brent Goose Census.
Autumn Estimate of population size Percentage of young (%) Mean brood size 2017 35,042 0.8 2.05 2016 36,811 11.9 2.60 2015 37,192 12.0 2.16 2014 31,985 4.1 2.10 2013 34,734 0.04 0.83 2012 41,465 1.9 2.61 2011 48,002 25.0 2.69 2010 38,708 3.1 3.36 2009 39,399 0.7 2.00 2008 37,996 18.2 3.42 2007 38,993 25.1 3.28 2006 31,882 2.2 2.33 2005 32,088 13.2 3.22 2004 32,923 21.7 3.43 2003 28,714 17.9 2.30
Burke, B., L.J. Lewis, N. Fitzgerald, T. Frost, G.E. Austin & T.D. Tierney. 2018. Estimates of waterbird numbers wintering in Ireland, 20011/12-2015/16. Irish Birds 11: 1-12.
Frost, T.M., N.A. Calbrade, G.A. Birtles, H.J. Mellan, C. Hall, A.E. Robinson,S.R. Wotton, D.E. Balmer & G.E. Austin. 2020. Waterbirds in the UK 2018/19: The Wetland Bird Survey. BTO, RSPB and JNCC, in association with WWT. British Trust for Ornithology, Thetford.
Frost, T., G.E. Austin, R.D. Hearn, S. McAvoy, A. Robinson, D.A. Stroud, I. Woodward & S.R. Wotton. 2019. Population estimates of wintering waterbirds in Great Britain. British Birds 112: 130-145.
The East Canadian High Arctic population of Light-bellied Brent Goose breeds in the eastern Queen Elizabeth Islands from eastern Melville Island to Devon Island and northern Ellesmere Island. Almost all of these geese winter in Ireland, with much smaller numbers reaching the west coast of Britain, the Channel Islands, and the north coasts of France and Spain. It undertakes one of the longest migrations of any Western Palearctic goose population, crossing the Greenland ice-cap, staging at sites in Greenland and Iceland before crossing the North Atlantic to Ireland.
Flyway of the East Canadian High Arctic Light-bellied Brent Goose
Strangford Lough in Northern Ireland hosts over 75% of the population during the late autumn and is now by far the most important site. Lough Foyle, on the north coast, has also become increasingly important in recent years as a landfall site. As winter progresses, these geese disperse around the coast of Ireland, favouring sites in the northwest, east, southeast, southwest and west of the country with notably high numbers at Dublin Bay and Wexford Harbour and Slobs. Over 3,000 also disperse thinly along the rocky coastlines of Ireland in the late winter (Robinson et al. 2004).
It has been suggested that Light-bellied Brent Geese may have relied almost entirely on Zostera during the winter, before a wasting disease caused almost the entire depletion of Zostera in Ireland during the 1930s. Since then, the diet in estuarine and saltmarsh areas has become more cosmopolitan, including algal foods such as Enteromorpha and Ulva, and saltmarsh plants such as Festuca and Puccinella. Inland feeding was first recorded in Ireland and Iceland during the mid 1970s. Feeding on grasslands has increased steadily since then, especially in east and southeast Ireland, with 25% of the population spending a large proportion of its time foraging on managed grasslands. In a few areas, most notably Wexford Slobs, Dungarvan Harbour and Strangford Lough, Light-bellied Brent Geese feed on cereal crops, both waste in autumn stubbles and spring seed, and waste potatoes. Although these food types remain available in early spring, most birds return to the saltmarshes at this time to exploit fresh growth of more natural foods prior to spring migration (Robinson et al. 2004).
Robinson, J.A., K. Colhoun, G.A. Gudmundsson, D. Boertmann, O.J. Merne, M. O’Briain, A.A. Portig, K. Mackie & H. Boyd. 2004. Light-bellied Brent Goose Branta bernicla hrota (East Canadian High Arctic population) in Canada, Ireland, Iceland, France, Greenland, Scotland, Wales, England, the Channel Islands and Spain 1960/61 – 1999/2000. Waterbird Review Series, The Wildfowl & Wetlands Trust/Joint Nature Conservation Committee, Slimbridge.
All-Ireland Light Bellied Brent Goose Census
A complete census of the ECHA Light Bellied Brent Goose population is undertaken twice a year, one in autumn and one in spring. Counters record the number of geese present and the age structure of flocks. The census is organised by the Irish Brent Goose Research Group.
Results from the census are summarised on the ‘Latest results’ tab.
Find out more about the All-Ireland Light Bellied Brent Goose Census
Results for 2017/18 [added September 2018]
In autumn 2017, the 22nd coordinated count of the East Atlantic High Arctic population of Light-bellied Brent Goose was organised by the Irish Brent Goose Research Group. Counts were undertaken in Iceland, Ireland, Britain and France, with good coverage of all major sites achieved.
A total of 35,042 geese was recorded, which is 4.8% lower than in 2016 (36,811 birds) (Figure 1). The majority of birds at the time of the census were in Ireland (34,164), with the largest concentration recorded at Strangford Lough, Northern Ireland (26,635). Surveys in Iceland recorded a total of 619 geese, with the remainder of the population (259 birds) in Britain and France.
Figure 1. Annual census-derived estimates of Canadian Light-bellied Brent Goose population size, 1961–2017. Five-year running mean shown as red line (e.g. mean for 2011 is from population estimates for 2009–2013). The open circle in 2014 represents a likely undercount due to a lack of coverage in Iceland.
Age assessments collected in 2017/18 suggest that the Canadian Light-bellied Brent Geese had a poor breeding season in 2017.
A sample of 17,184 geese were aged, representing 49% of the 2017 population estimate, of which only 140 (0.8%) were identified as young birds (Figure 2). This is considerably lower than the previous ten-year mean (10.2 % for 2007/08–2016/17) and amongst the lowest recorded since records began. The mean brood size was, however, only slightly lower than the previous ten-year average (2.50 0.25 for 2007/08–2016/17) with 2.05 young per successful pair recorded for the 60 broods assessed (Figure 2).
Figure 2. The percentage of young (blue columns) and mean brood size (red circles) of Canadian Light-bellied Brent Geese, 1960/61–2017/18.
Previous annual results will be archived here.
2016/17 Results (including 2015/16 results)
2012/13 Results (including 2011/12 results)
Colour-marking of this population began in 2001 and is overseen by the Irish Brent Goose Research Group. A large number of birds are currently colour-marked with engraved rings on each leg, and this underpins a range of detailed scientific studies also being carried out on this small, but increasing, population. Further details about this work can be found here.
Robinson, J.A., K. Colhoun, G.A. Gudmundsson, D. Boertmann, O.J. Merne, M. O’Briain, A.A. Portig, K. Mackie & H. Boyd. 2004. Light-bellied Brent Goose Branta bernicla hrota (East Canadian High Arctic population) in Canada, Ireland, Iceland, France, Greenland, Scotland, Wales, England, the Channel Islands and Spain 1960/61 – 1999/2000. Waterbird Review Series, The Wildfowl & Wetlands Trust/Joint Nature Conservation Committee, Slimbridge. Download
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