White-tailed Eagle

White-tailed Eagle
White-tailed Eagle (A. Challis)

Introduction to the species - see BTO,  RSPB and SRSG websites
Breeding distribution - see Bird Atlas
Protection designations - Birds Directive 1979 (Annex 1), Wildlife and Countryside Act 1981 (Schedule 1)
Monitoring method - see Raptors: A Field Guide for Surveys and Monitoring

Annual monitoring data

Please click on the links below to access summary data. These summaries are based on SRMS regions.  Descriptions of some of the main headings reported against are provided here.

2015

National trends

Please click on the links within the table below to view the graphed trend of interest. For further information regarding the production of trends please click here.

ParameterPeriodYearsMean annual sample + SEType of trendMean + SE
Breeding pairs1983-201533NA*Exponential increase27.4 ± 4.4
Laying success1995-20152138.3 ± 5.2Linear increase0.9 ± 0.0
Clutch size1983-20153320.5 ± 2.9Stable1.5 ± 0.0
Hatching success1995-20152136.7 ± 4.6Linear increase0.7 ± 0.2
Brood size1995-20152124.0 ± 3.3Stable1.5 ± 0.0
Fledging success1985-20153124.6 ± 3.9Linear increase0.6 ± 0.0
Number of fledglings1995-20152120.8 ± 3.3Stable1.4 ± 0.0
*No annual sample was calculated, because we were not dealing with a sample of breeding pairs, as we had full knowledge of every pair. Therefore, we give the mean annual number of pairs in the column "Mean ± SE".

Regional trends

Please click on the links within the tables below to view the graphed trend of interest. Regional trends are available for both SRMS regions and Natural Heritage Zones.  For further information regarding the production of trends please click here.

White-tailed Eagle regional population trends based on SRMS regions:

SRMS RegionBreeding parameterPeriodYearsMean annual sample + SETrendMean + SE
ArgyllBreeding pairs1998 - 201518N/A*Linear increase13.3 ± 1.9
ArgyllClutch size1998-2014179.7 ± 1.1Stable1.6 ± 0.0
ArgyllHatching success2007 - 2015917.6 ± 1.9Stable0.8 ± 0.0
ArgyllBrood size2000 - 2015169.9 ± 1.2Stable1.4 ± 0.4
ArgyllFledging success1998 - 20151811.8 ± 1.7Linear increase0.7 ± 0.0
ArgyllNumber of fledglings2005 - 20151111.5 ± 1.4Stable1.3 ± 0.0
HighlandBreeding pairs1987 - 201529NA*Linear increase14.3 ± 1.8
HighlandClutch size1990 - 20152611.8 ± 1.3Stable1.4 ± 0.0
HighlandHatching success1996 - 20152017.1 ± 1.5Stable0.7 ± 0.0
HighlandBrood size1995 - 20152110.2 ± 1.2Stable1.5 ± 0.0
HighlandFledging success1994 - 20152214.6 ± 1.5Stable0.6 ± 0.0
HighlandNumber of fledglings1998 - 2015189.3 ± 1.0Stable1.4 ± 0.0
Lewis & HarrisBreeding pairs2004 - 201512NA*Linear increase9.4 ± 1.2
Lewis & HarrisClutch size2005 - 2015118.6 ± 1.2Stable1.5 ± 0.1
Lewis & HarrisHatching success2006 - 20151010.2 ± 1.4Stable0.6 ± 0.1
Lewis & HarrisBrood size2005 - 2015116.1 ± 0.9Stable1.6 ± 0.1
Lewis & HarrisFledging success2008 - 201589.3 ± 1.3Linear increase0.6 ± 0.1
Lewis & HarrisNumber of fledglings2007 - 201595.6 ± 1.0Stable1.6 ± 0.1
UistBreeding pairsN/A**
UistClutch sizeN/A**
UistHatching successN/A**
UistBrood sizeN/A**
UistFledging successN/A**
UistNumber of fledglingsN/A**

*No annual sample was calculated, because we were not dealing with a sample of breeding pairs, as we had full knowledge of every pair. Therefore, we give the mean annual number of pairs in the column "Mean ± SE". **Sample size too small for meaningful trend production.

White-tailed Eagle regional population trends based on Natural Heritage Zones:

NHZBreeding parameterPeriodYearsMean annual sample size + SEType of trendMean + SE
3. Coll, Tiree & the Western IslesBreeding pairs2000 - 201516N/A*Linear increase11.4 + 1.7
3. Coll, Tiree & the Western IslesClutch size2002 - 2015149.9 ± 1.2Stable1.5 ± 0.1
3. Coll, Tiree & the Western IslesHatching success2006 - 20151014.4 ± 1.6Linear increase0.7 ± 0.0
3. Coll, Tiree & the Western IslesBrood size2004 - 2015128.7 ± 1.0Stable1.6 ± 0.1
3. Coll, Tiree & the Western IslesFledging success2008 - 2015814.1 ± 1.6Linear increase0.7 ± 0.0
3. Coll, Tiree & the Western IslesNumber of fledglings2006 - 2015108.7 ± 1.2Stable1.5 ± 0.1
4. North West SeaboardBreeding pairs2008 - 20158N/A*Stable5.4 ± 0.4
4. North West SeaboardClutch size2005 - 2015113.6 ± 0.3Stable1.6 ± 0.1
4. North West SeaboardHatching successN/A**
4. North West SeaboardBrood sizeN/A**
4. North West SeaboardFledging success2012 - 201544.8 ± 0.5Stable0.7 ± 0.1
4. North West SeaboardNumber of fledglingsN/A**
6. Western SeaboardBreeding pairs1986 - 201530N/A*Linear increase17.2 ± 2.0
6. Western SeaboardClutch size1986 - 20153012.9 ± 1.3Stable1.5 ± 0.0
6. Western SeaboardHatching success1995 - 20152120.8 ± 1.6Stable0.7 ± 0.0
6. Western SeaboardBrood size1991 - 20152511.9 ± 1.3Stable1.5 ± 0.0
6. Western SeaboardFledging success1987 - 20152915.3 ± 1.7Stable0.6 ± 0.0
6. Western SeaboardNumber of fledglings1995 - 20152111.4 ± 1.4Stable1.4 ± 0.0
8. Western HighlandsBreeding pairs2010 - 20156N/A*Stable4.3 ± 0.3
8. Western HighlandsClutch size
8. Western HighlandsHatching success
8. Western HighlandsBrood size
8. Western HighlandsFledging success
8. Western HighlandsNumber of fledglings
14. Argyll West & IslandsBreeding pairs2010 - 20156N/A*Linear increase5.5 ± 1.1
14. Argyll West & IslandsClutch size
14. Argyll West & IslandsHatching success
14. Argyll West & IslandsBrood size
14. Argyll West & IslandsFledging success
14. Argyll West & IslandsNumber of fledglings

*No annual sample was calculated, because we were not dealing with a sample of breeding pairs, as we had full knowledge of every pair. Therefore, we give the mean annual number of pairs in the column "Mean ± SE". **Sample size too small for meaningful trend production.