I-WeBS Marlfield 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 Marlfield Lake (site code 0J001) 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 | Marlfield Lake - 5 Year | Marlfield Lake - 12 Year | Marlfield Lake - 23 Year | Long Term Trend |
|---|---|---|---|---|
| Tufted Duck | -23.2 | 14.1 | -45.1 | Moderate Decline |
| Pochard | 37.7 | -37.6 | -29.8 | Moderate Decline |
| Coot | 10.7 | 23.9 | -26.4 | Moderate Decline |
| Shoveler | 68.3 | 27.8 | -24.1 | Intermediate Decline |
| Mallard | -17.5 | -2.8 | -19.4 | Intermediate Decline |
| Grey Heron | 1.1 | 0.0 | -4.1 | Intermediate Decline |
| Mute Swan | 25.3 | 25.3 | 9.3 | Stable or Increasing |
| Teal | 29.5 | 24.7 | 71.2 | Stable or Increasing |
| Cormorant | 22.8 | 115.6 | 73.2 | Stable or Increasing |
| Little Grebe | 5.6 | -9.5 | 126.2 | Stable or Increasing |
| Gadwall | -35.2 | -6.5 | 157.8 | Stable or Increasing |
Species Analysis
Mute Swan
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Marlfield Lake | 25.3 | 25.3 | 9.3 |
| National | 4.6 | 9.6 | 13.8 |
Shoveler
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Marlfield Lake | 68.3 | 27.8 | -24.1 |
| National | 23.0 | -21.3 | -10.8 |
Gadwall
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Marlfield Lake | -35.2 | -6.5 | 157.8 |
| National | -26.5 | 4.3 | 24.4 |
Mallard
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Marlfield Lake | -17.5 | -2.8 | -19.4 |
| National | -11.3 | -19.7 | -19.1 |
Teal
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Marlfield Lake | 29.5 | 24.7 | 71.2 |
| National | 1.8 | 5.7 | 19.4 |
Pochard
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Marlfield Lake | 37.7 | -37.6 | -29.8 |
| National | -19.8 | -60.4 | -79.1 |
Tufted Duck
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Marlfield Lake | -23.2 | 14.1 | -45.1 |
| National | -20.7 | -28.9 | -17.9 |
Coot
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Marlfield Lake | 10.7 | 23.9 | -26.4 |
| National | -10.1 | 1.1 | -23.2 |
Little Grebe
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Marlfield Lake | 5.6 | -9.5 | 126.2 |
| National | 6.1 | 16.7 | 38.2 |
Cormorant
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Marlfield Lake | 22.8 | 115.6 | 73.2 |
| National | 38.5 | 8.4 | 42.9 |
Grey Heron
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Marlfield Lake | 1.1 | 0.0 | -4.1 |
| 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)