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 Dublin Bay (site code 0U404) 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

Trend (%)
Species Dublin Bay - 5 Year Dublin Bay - 12 Year Dublin Bay - 23 Year Long Term Trend
Purple Sandpiper -89.6 -88.4 -69.3 Large Decline
Grey Plover 10.1 -5.0 -51.6 Large Decline
Lapwing -36.0 -33.6 -40.3 Moderate Decline
Shoveler -5.9 14.4 -32.2 Moderate Decline
Ringed Plover 6.5 -52.1 -14.5 Intermediate Decline
Curlew -14.1 -22.7 -4.5 Intermediate Decline
Pintail 24.4 78.3 8.1 Stable or Increasing
Bar-tailed Godwit -20.8 20.6 31.0 Stable or Increasing
Dunlin 69.6 18.6 32.7 Stable or Increasing
Redshank -5.3 -8.2 45.9 Stable or Increasing
Shelduck 29.8 49.3 58.0 Stable or Increasing
Wigeon 61.9 126.7 78.9 Stable or Increasing
Teal 9.2 43.4 80.3 Stable or Increasing
Sanderling 15.0 -13.2 84.0 Stable or Increasing
Mallard 32.2 134.7 91.7 Stable or Increasing
Turnstone -26.4 -30.3 91.7 Stable or Increasing
Oystercatcher 1.9 12.8 103.8 Stable or Increasing
Golden Plover 948.0 147.2 114.8 Stable or Increasing
Red-breasted Merganser 2.9 37.3 118.8 Stable or Increasing
Knot 68.5 33.8 127.5 Stable or Increasing
Grey Heron 11.6 2.7 148.4 Stable or Increasing
Great Crested Grebe -54.1 69.9 188.4 Stable or Increasing
Cormorant 3.8 -22.9 189.3 Stable or Increasing
Light-bellied Brent Goose -7.0 22.2 230.0 Stable or Increasing
Greenshank 15.6 48.6 235.5 Stable or Increasing
Black-tailed Godwit 120.0 193.3 780.0 Stable or Increasing
Mute Swan 252.6 378.6 1016.7 Stable or Increasing
Little Grebe -26.3 1300.0 1020.0 Stable or Increasing
Little Egret 78.3 121.6 1540.0 Stable or Increasing

Species Analysis

Light-bellied Brent Goose

Trend (%)
Site 5 Year 12 Year 23 Year
Dublin Bay -7.0 22.2 230.0
National -11.2 1.2 93.3

Mute Swan

Trend (%)
Site 5 Year 12 Year 23 Year
Dublin Bay 252.6 378.6 1016.7
National 4.6 9.6 13.8

Shelduck

Trend (%)
Site 5 Year 12 Year 23 Year
Dublin Bay 29.8 49.3 58.0
National 6.3 -0.8 9.3

Shoveler

Trend (%)
Site 5 Year 12 Year 23 Year
Dublin Bay -5.9 14.4 -32.2
National 23.0 -21.3 -10.8

Wigeon

Trend (%)
Site 5 Year 12 Year 23 Year
Dublin Bay 61.9 126.7 78.9
National 0.9 -17.0 -18.2

Mallard

Trend (%)
Site 5 Year 12 Year 23 Year
Dublin Bay 32.2 134.7 91.7
National -11.3 -19.7 -19.1

Pintail

Trend (%)
Site 5 Year 12 Year 23 Year
Dublin Bay 24.4 78.3 8.1
National -0.8 -6.0 -13.7

Teal

Trend (%)
Site 5 Year 12 Year 23 Year
Dublin Bay 9.2 43.4 80.3
National 1.8 5.7 19.4

Red-breasted Merganser

Trend (%)
Site 5 Year 12 Year 23 Year
Dublin Bay 2.9 37.3 118.8
National -12.9 5.2 -14.7

Little Grebe

Trend (%)
Site 5 Year 12 Year 23 Year
Dublin Bay -26.3 1300.0 1020.0
National 6.1 16.7 38.2

Great Crested Grebe

Trend (%)
Site 5 Year 12 Year 23 Year
Dublin Bay -54.1 69.9 188.4
National -39.5 -6.1 -10.8

Oystercatcher

Trend (%)
Site 5 Year 12 Year 23 Year
Dublin Bay 1.9 12.8 103.8
National -17.5 -31.1 10.8

Lapwing

Trend (%)
Site 5 Year 12 Year 23 Year
Dublin Bay -36.0 -33.6 -40.3
National -6.5 -45.1 -63.9

Golden Plover

Trend (%)
Site 5 Year 12 Year 23 Year
Dublin Bay 948.0 147.2 114.8
National -16.9 -58.1 -54.1

Grey Plover

Trend (%)
Site 5 Year 12 Year 23 Year
Dublin Bay 10.1 -5.0 -51.6
National -30.6 -39.4 -57.8

Ringed Plover

Trend (%)
Site 5 Year 12 Year 23 Year
Dublin Bay 6.5 -52.1 -14.5
National -4.3 -26.8 -1.1

Curlew

Trend (%)
Site 5 Year 12 Year 23 Year
Dublin Bay -14.1 -22.7 -4.5
National -9.4 -23.7 -43.1

Bar-tailed Godwit

Trend (%)
Site 5 Year 12 Year 23 Year
Dublin Bay -20.8 20.6 31.0
National -32.6 -13.9 -5.1

Black-tailed Godwit

Trend (%)
Site 5 Year 12 Year 23 Year
Dublin Bay 120.0 193.3 780.0
National 22.5 25.0 92.3

Turnstone

Trend (%)
Site 5 Year 12 Year 23 Year
Dublin Bay -26.4 -30.3 91.7
National -33.6 -46.0 -23.7

Knot

Trend (%)
Site 5 Year 12 Year 23 Year
Dublin Bay 68.5 33.8 127.5
National 0.0 -12.2 -9.8

Sanderling

Trend (%)
Site 5 Year 12 Year 23 Year
Dublin Bay 15.0 -13.2 84.0
National -23.8 -11.1 84.6

Dunlin

Trend (%)
Site 5 Year 12 Year 23 Year
Dublin Bay 69.6 18.6 32.7
National 5.9 -21.2 -45.2

Purple Sandpiper

Trend (%)
Site 5 Year 12 Year 23 Year
Dublin Bay -89.6 -88.4 -69.3
National -36.4 -37.6 23.5

Redshank

Trend (%)
Site 5 Year 12 Year 23 Year
Dublin Bay -5.3 -8.2 45.9
National -14.0 -28.4 6.7

Greenshank

Trend (%)
Site 5 Year 12 Year 23 Year
Dublin Bay 15.6 48.6 235.5
National 0.9 7.3 41.0

Cormorant

Trend (%)
Site 5 Year 12 Year 23 Year
Dublin Bay 3.8 -22.9 189.3
National 38.5 8.4 42.9

Grey Heron

Trend (%)
Site 5 Year 12 Year 23 Year
Dublin Bay 11.6 2.7 148.4
National 1.0 -4.9 6.6

Little Egret

Trend (%)
Site 5 Year 12 Year 23 Year
Dublin Bay 78.3 121.6 1540.0
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)