I-WeBS Lough Swilly Trends Report
I-WeBS Trends Report 1994/95 – 2019/20
Published 2022-04-01
Introduction
This report presents site trends based on the data gathered by the Irish Wetland Bird Survey (I-WeBS). Only species with sufficient data at Lough Swilly (site code 0A401) are presented.
This report is part of the I-WeBS National and Site Trends Report 1994/95 – 2019/20.
For guidance on how to interpret these trends, please see the I-WeBS Trends Report Guidance.
For details on the methods used to generate these trends, please see the I-WeBS Trends Report Methodology.
Site Summary
| Species | Lough Swilly - 5 Year | Lough Swilly - 12 Year | Lough Swilly - 23 Year | Long Term Trend |
|---|---|---|---|---|
| Scaup | -15.4 | -86.9 | -88.3 | Large Decline |
| Grey Plover | -76.4 | -83.8 | -74.9 | Large Decline |
| Pochard | 93.3 | -29.3 | -61.3 | Large Decline |
| Goldeneye | -36.5 | -38.2 | -55.0 | Large Decline |
| Dunlin | -3.8 | -18.7 | -46.4 | Moderate Decline |
| Golden Plover | -36.9 | -53.2 | -45.9 | Moderate Decline |
| Great Crested Grebe | -46.3 | -22.0 | -38.9 | Moderate Decline |
| Curlew | -7.8 | -17.2 | -29.8 | Moderate Decline |
| Coot | -19.2 | -28.9 | -24.6 | Intermediate Decline |
| Ringed Plover | -46.1 | -48.8 | -17.0 | Intermediate Decline |
| Lapwing | 2.9 | 2.9 | -15.0 | Intermediate Decline |
| Mallard | -13.3 | -14.6 | -13.3 | Intermediate Decline |
| Turnstone | -34.8 | -54.5 | -0.8 | Stable or Increasing |
| Redshank | -20.0 | -31.1 | 14.8 | Stable or Increasing |
| Red-breasted Merganser | -2.4 | 20.9 | 15.7 | Stable or Increasing |
| Wigeon | 19.2 | 25.5 | 18.0 | Stable or Increasing |
| Oystercatcher | -24.2 | -18.8 | 19.0 | Stable or Increasing |
| Mute Swan | 5.2 | 12.2 | 23.2 | Stable or Increasing |
| Shelduck | 21.7 | 38.6 | 34.6 | Stable or Increasing |
| Grey Heron | 33.3 | 14.9 | 35.1 | Stable or Increasing |
| Tufted Duck | 6.6 | -13.3 | 35.4 | Stable or Increasing |
| Teal | -0.8 | 9.3 | 50.0 | Stable or Increasing |
| Knot | 11.4 | 27.3 | 55.6 | Stable or Increasing |
| Little Grebe | -12.3 | -2.6 | 56.2 | Stable or Increasing |
| Greenshank | -0.9 | 10.9 | 60.0 | Stable or Increasing |
| Bar-tailed Godwit | -22.5 | 127.7 | 109.8 | Stable or Increasing |
| Shoveler | 121.8 | 121.8 | 133.8 | Stable or Increasing |
| Light-bellied Brent Goose | 0.0 | 31.7 | 176.7 | Stable or Increasing |
| Gadwall | 241.4 | 140.6 | 201.3 | Stable or Increasing |
| Sanderling | -61.9 | 42.6 | 206.4 | Stable or Increasing |
| Pintail | 202.2 | 202.2 | 226.4 | Stable or Increasing |
| Cormorant | 173.3 | 241.7 | 272.7 | Stable or Increasing |
| Black-tailed Godwit | 136.5 | 355.6 | 515.0 | Stable or Increasing |
| Little Egret | 284.2 | 461.5 | 942.9 | Stable or Increasing |
Species Analysis
Light-bellied Brent Goose
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Lough Swilly | 0.0 | 31.7 | 176.7 |
| National | -11.2 | 1.2 | 93.3 |
Mute Swan
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Lough Swilly | 5.2 | 12.2 | 23.2 |
| National | 4.6 | 9.6 | 13.8 |
Shelduck
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Lough Swilly | 21.7 | 38.6 | 34.6 |
| National | 6.3 | -0.8 | 9.3 |
Shoveler
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Lough Swilly | 121.8 | 121.8 | 133.8 |
| National | 23.0 | -21.3 | -10.8 |
Gadwall
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Lough Swilly | 241.4 | 140.6 | 201.3 |
| National | -26.5 | 4.3 | 24.4 |
Wigeon
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Lough Swilly | 19.2 | 25.5 | 18.0 |
| National | 0.9 | -17.0 | -18.2 |
Mallard
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Lough Swilly | -13.3 | -14.6 | -13.3 |
| National | -11.3 | -19.7 | -19.1 |
Pintail
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Lough Swilly | 202.2 | 202.2 | 226.4 |
| National | -0.8 | -6.0 | -13.7 |
Teal
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Lough Swilly | -0.8 | 9.3 | 50.0 |
| National | 1.8 | 5.7 | 19.4 |
Pochard
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Lough Swilly | 93.3 | -29.3 | -61.3 |
| National | -19.8 | -60.4 | -79.1 |
Tufted Duck
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Lough Swilly | 6.6 | -13.3 | 35.4 |
| National | -20.7 | -28.9 | -17.9 |
Scaup
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Lough Swilly | -15.4 | -86.9 | -88.3 |
| National | -33.6 | -82.9 | -89.2 |
Goldeneye
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Lough Swilly | -36.5 | -38.2 | -55.0 |
| National | -32.5 | -39.0 | -66.9 |
Red-breasted Merganser
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Lough Swilly | -2.4 | 20.9 | 15.7 |
| National | -12.9 | 5.2 | -14.7 |
Coot
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Lough Swilly | -19.2 | -28.9 | -24.6 |
| National | -10.1 | 1.1 | -23.2 |
Little Grebe
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Lough Swilly | -12.3 | -2.6 | 56.2 |
| National | 6.1 | 16.7 | 38.2 |
Great Crested Grebe
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Lough Swilly | -46.3 | -22.0 | -38.9 |
| National | -39.5 | -6.1 | -10.8 |
Oystercatcher
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Lough Swilly | -24.2 | -18.8 | 19.0 |
| National | -17.5 | -31.1 | 10.8 |
Lapwing
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Lough Swilly | 2.9 | 2.9 | -15.0 |
| National | -6.5 | -45.1 | -63.9 |
Golden Plover
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Lough Swilly | -36.9 | -53.2 | -45.9 |
| National | -16.9 | -58.1 | -54.1 |
Grey Plover
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Lough Swilly | -76.4 | -83.8 | -74.9 |
| National | -30.6 | -39.4 | -57.8 |
Ringed Plover
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Lough Swilly | -46.1 | -48.8 | -17.0 |
| National | -4.3 | -26.8 | -1.1 |
Curlew
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Lough Swilly | -7.8 | -17.2 | -29.8 |
| National | -9.4 | -23.7 | -43.1 |
Bar-tailed Godwit
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Lough Swilly | -22.5 | 127.7 | 109.8 |
| National | -32.6 | -13.9 | -5.1 |
Black-tailed Godwit
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Lough Swilly | 136.5 | 355.6 | 515.0 |
| National | 22.5 | 25.0 | 92.3 |
Turnstone
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Lough Swilly | -34.8 | -54.5 | -0.8 |
| National | -33.6 | -46.0 | -23.7 |
Knot
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Lough Swilly | 11.4 | 27.3 | 55.6 |
| National | 0.0 | -12.2 | -9.8 |
Sanderling
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Lough Swilly | -61.9 | 42.6 | 206.4 |
| National | -23.8 | -11.1 | 84.6 |
Dunlin
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Lough Swilly | -3.8 | -18.7 | -46.4 |
| National | 5.9 | -21.2 | -45.2 |
Redshank
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Lough Swilly | -20.0 | -31.1 | 14.8 |
| National | -14.0 | -28.4 | 6.7 |
Greenshank
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Lough Swilly | -0.9 | 10.9 | 60.0 |
| National | 0.9 | 7.3 | 41.0 |
Cormorant
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Lough Swilly | 173.3 | 241.7 | 272.7 |
| National | 38.5 | 8.4 | 42.9 |
Grey Heron
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Lough Swilly | 33.3 | 14.9 | 35.1 |
| National | 1.0 | -4.9 | 6.6 |
Little Egret
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Lough Swilly | 284.2 | 461.5 | 942.9 |
| National | 34.6 | 61.5 | 483.3 |
Citations
Please cite this work as follows:
Kennedy, J., Burke, B., Fitzgerald, N., Kelly, S.B.A., Walsh, A.J. & Lewis, L.J. 2022. Irish Wetland Bird Survey: I-WeBS National and Site Trends Report 1994/95 – 2019/20. BirdWatch Ireland Waterbird Report to the National Parks and Wildlife Service. BirdWatch Ireland, Wicklow. (https://birdwatchireland.ie/app/uploads/2022/04/iwebs_trends_report.html)