I-WeBS Rostaff Lake 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 Rostaff Lake (site code 0D305) 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 | Rostaff Lake - 5 Year | Rostaff Lake - 12 Year | Rostaff Lake - 23 Year | Long Term Trend |
|---|---|---|---|---|
| Gadwall | NA | -100.0 | -100.0 | Large Decline |
| Dunlin | 100.0 | -91.3 | -98.9 | Large Decline |
| Pochard | -24.8 | -54.3 | -86.3 | Large Decline |
| Golden Plover | 357.1 | -73.6 | -85.5 | Large Decline |
| Mallard | -8.5 | -65.1 | -73.8 | Large Decline |
| Mute Swan | 233.3 | 16.7 | -67.6 | Large Decline |
| Teal | -6.1 | -66.1 | -59.3 | Large Decline |
| Lapwing | 89.3 | 17.8 | -57.6 | Large Decline |
| Shoveler | -12.3 | -38.8 | -50.3 | Large Decline |
| Wigeon | 34.8 | -11.4 | -47.8 | Moderate Decline |
| Grey Heron | 195.7 | -40.4 | -30.6 | Moderate Decline |
| Curlew | -26.8 | 5.1 | -29.7 | Moderate Decline |
| Cormorant | 70.0 | -55.7 | -15.0 | Intermediate Decline |
| Tufted Duck | -16.3 | 123.1 | 24.3 | Stable or Increasing |
Species Analysis
Mute Swan
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Rostaff Lake | 233.3 | 16.7 | -67.6 |
| National | 4.6 | 9.6 | 13.8 |
Shoveler
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Rostaff Lake | -12.3 | -38.8 | -50.3 |
| National | 23.0 | -21.3 | -10.8 |
Gadwall
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| National | -26.5 | 4.3 | 24.4 |
| Rostaff Lake | NA | -100.0 | -100.0 |
Wigeon
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Rostaff Lake | 34.8 | -11.4 | -47.8 |
| National | 0.9 | -17.0 | -18.2 |
Mallard
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Rostaff Lake | -8.5 | -65.1 | -73.8 |
| National | -11.3 | -19.7 | -19.1 |
Teal
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Rostaff Lake | -6.1 | -66.1 | -59.3 |
| National | 1.8 | 5.7 | 19.4 |
Pochard
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Rostaff Lake | -24.8 | -54.3 | -86.3 |
| National | -19.8 | -60.4 | -79.1 |
Tufted Duck
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Rostaff Lake | -16.3 | 123.1 | 24.3 |
| National | -20.7 | -28.9 | -17.9 |
Lapwing
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Rostaff Lake | 89.3 | 17.8 | -57.6 |
| National | -6.5 | -45.1 | -63.9 |
Golden Plover
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Rostaff Lake | 357.1 | -73.6 | -85.5 |
| National | -16.9 | -58.1 | -54.1 |
Curlew
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Rostaff Lake | -26.8 | 5.1 | -29.7 |
| National | -9.4 | -23.7 | -43.1 |
Dunlin
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Rostaff Lake | 100.0 | -91.3 | -98.9 |
| National | 5.9 | -21.2 | -45.2 |
Cormorant
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Rostaff Lake | 70.0 | -55.7 | -15.0 |
| National | 38.5 | 8.4 | 42.9 |
Grey Heron
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Rostaff Lake | 195.7 | -40.4 | -30.6 |
| National | 1.0 | -4.9 | 6.6 |
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)