I-WeBS Rogerstown Estuary 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 Rogerstown Estuary (site code 0U407) 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 | Rogerstown Estuary - 5 Year | Rogerstown Estuary - 12 Year | Rogerstown Estuary - 23 Year | Long Term Trend |
|---|---|---|---|---|
| Knot | 262.7 | 29.7 | -63.8 | Large Decline |
| Grey Plover | -42.2 | -66.6 | -59.0 | Large Decline |
| Sanderling | -76.0 | -17.5 | -47.8 | Moderate Decline |
| Lapwing | 9.3 | -30.2 | -38.2 | Moderate Decline |
| Dunlin | -24.4 | -59.6 | -34.8 | Moderate Decline |
| Mallard | -29.1 | -35.7 | -19.5 | Intermediate Decline |
| Great Crested Grebe | -53.8 | -18.7 | -3.2 | Intermediate Decline |
| Shoveler | 56.8 | -36.7 | 3.0 | Stable or Increasing |
| Shelduck | -14.1 | -12.3 | 6.7 | Stable or Increasing |
| Golden Plover | -7.5 | -68.5 | 19.9 | Stable or Increasing |
| Redshank | 6.9 | -24.4 | 25.9 | Stable or Increasing |
| Red-breasted Merganser | -9.3 | 11.4 | 35.4 | Stable or Increasing |
| Grey Heron | 33.8 | -5.2 | 46.8 | Stable or Increasing |
| Turnstone | 20.5 | -1.9 | 53.6 | Stable or Increasing |
| Oystercatcher | -28.7 | -33.3 | 64.9 | Stable or Increasing |
| Curlew | 122.9 | -8.2 | 81.4 | Stable or Increasing |
| Black-tailed Godwit | 35.9 | -36.4 | 90.8 | Stable or Increasing |
| Little Grebe | -36.2 | -24.5 | 118.3 | Stable or Increasing |
| Light-bellied Brent Goose | 57.3 | 18.6 | 122.2 | Stable or Increasing |
| Ringed Plover | 222.0 | 2.3 | 149.1 | Stable or Increasing |
| Teal | 35.6 | 28.6 | 182.9 | Stable or Increasing |
| Mute Swan | 173.3 | 215.4 | 203.7 | Stable or Increasing |
| Cormorant | 117.3 | 71.6 | 219.6 | Stable or Increasing |
| Purple Sandpiper | -42.1 | -46.3 | 225.9 | Stable or Increasing |
| Wigeon | 143.4 | 101.6 | 230.8 | Stable or Increasing |
| Greenshank | 40.7 | 83.4 | 297.0 | Stable or Increasing |
| Bar-tailed Godwit | 60.8 | 784.6 | 693.1 | Stable or Increasing |
| Little Egret | 59.0 | 100.0 | 1671.4 | Stable or Increasing |
Species Analysis
Light-bellied Brent Goose
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Rogerstown Estuary | 57.3 | 18.6 | 122.2 |
| National | -11.2 | 1.2 | 93.3 |
Mute Swan
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Rogerstown Estuary | 173.3 | 215.4 | 203.7 |
| National | 4.6 | 9.6 | 13.8 |
Shelduck
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Rogerstown Estuary | -14.1 | -12.3 | 6.7 |
| National | 6.3 | -0.8 | 9.3 |
Shoveler
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Rogerstown Estuary | 56.8 | -36.7 | 3.0 |
| National | 23.0 | -21.3 | -10.8 |
Wigeon
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Rogerstown Estuary | 143.4 | 101.6 | 230.8 |
| National | 0.9 | -17.0 | -18.2 |
Mallard
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Rogerstown Estuary | -29.1 | -35.7 | -19.5 |
| National | -11.3 | -19.7 | -19.1 |
Teal
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Rogerstown Estuary | 35.6 | 28.6 | 182.9 |
| National | 1.8 | 5.7 | 19.4 |
Red-breasted Merganser
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Rogerstown Estuary | -9.3 | 11.4 | 35.4 |
| National | -12.9 | 5.2 | -14.7 |
Little Grebe
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Rogerstown Estuary | -36.2 | -24.5 | 118.3 |
| National | 6.1 | 16.7 | 38.2 |
Great Crested Grebe
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Rogerstown Estuary | -53.8 | -18.7 | -3.2 |
| National | -39.5 | -6.1 | -10.8 |
Oystercatcher
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Rogerstown Estuary | -28.7 | -33.3 | 64.9 |
| National | -17.5 | -31.1 | 10.8 |
Lapwing
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Rogerstown Estuary | 9.3 | -30.2 | -38.2 |
| National | -6.5 | -45.1 | -63.9 |
Golden Plover
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Rogerstown Estuary | -7.5 | -68.5 | 19.9 |
| National | -16.9 | -58.1 | -54.1 |
Grey Plover
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Rogerstown Estuary | -42.2 | -66.6 | -59.0 |
| National | -30.6 | -39.4 | -57.8 |
Ringed Plover
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Rogerstown Estuary | 222.0 | 2.3 | 149.1 |
| National | -4.3 | -26.8 | -1.1 |
Curlew
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Rogerstown Estuary | 122.9 | -8.2 | 81.4 |
| National | -9.4 | -23.7 | -43.1 |
Bar-tailed Godwit
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Rogerstown Estuary | 60.8 | 784.6 | 693.1 |
| National | -32.6 | -13.9 | -5.1 |
Black-tailed Godwit
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Rogerstown Estuary | 35.9 | -36.4 | 90.8 |
| National | 22.5 | 25.0 | 92.3 |
Turnstone
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Rogerstown Estuary | 20.5 | -1.9 | 53.6 |
| National | -33.6 | -46.0 | -23.7 |
Knot
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Rogerstown Estuary | 262.7 | 29.7 | -63.8 |
| National | 0.0 | -12.2 | -9.8 |
Sanderling
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Rogerstown Estuary | -76.0 | -17.5 | -47.8 |
| National | -23.8 | -11.1 | 84.6 |
Dunlin
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Rogerstown Estuary | -24.4 | -59.6 | -34.8 |
| National | 5.9 | -21.2 | -45.2 |
Purple Sandpiper
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Rogerstown Estuary | -42.1 | -46.3 | 225.9 |
| National | -36.4 | -37.6 | 23.5 |
Redshank
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Rogerstown Estuary | 6.9 | -24.4 | 25.9 |
| National | -14.0 | -28.4 | 6.7 |
Greenshank
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Rogerstown Estuary | 40.7 | 83.4 | 297.0 |
| National | 0.9 | 7.3 | 41.0 |
Cormorant
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Rogerstown Estuary | 117.3 | 71.6 | 219.6 |
| National | 38.5 | 8.4 | 42.9 |
Grey Heron
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Rogerstown Estuary | 33.8 | -5.2 | 46.8 |
| National | 1.0 | -4.9 | 6.6 |
Little Egret
| Site | 5 Year | 12 Year | 23 Year |
|---|---|---|---|
| Rogerstown Estuary | 59.0 | 100.0 | 1671.4 |
| 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)