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 Ballyallia Lake (site code 0H001) 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 Ballyallia Lake - 5 Year Ballyallia Lake - 12 Year Ballyallia Lake - 23 Year Long Term Trend
Pochard 21.4 -90.9 -97.5 Large Decline
Dunlin 170.0 -65.4 -92.4 Large Decline
Redshank 170.7 11.0 -65.1 Large Decline
Mallard 35.6 -25.9 -56.0 Large Decline
Grey Heron 51.9 -24.1 -50.3 Large Decline
Shoveler 118.9 -25.7 -48.1 Moderate Decline
Cormorant -34.2 -42.7 -45.7 Moderate Decline
Gadwall -17.9 7.8 -45.7 Moderate Decline
Lapwing 315.2 -39.4 -43.6 Moderate Decline
Great Crested Grebe -33.6 -36.3 -31.0 Moderate Decline
Coot 15.6 20.9 -24.6 Intermediate Decline
Wigeon 12.4 -18.7 -24.3 Intermediate Decline
Curlew -2.1 -3.1 -23.4 Intermediate Decline
Tufted Duck -1.4 -14.5 -5.3 Intermediate Decline
Pintail -10.9 9.3 1.0 Stable or Increasing
Teal 20.3 6.0 23.6 Stable or Increasing
Little Grebe -13.3 31.9 24.7 Stable or Increasing
Mute Swan 55.7 23.9 70.3 Stable or Increasing
Black-tailed Godwit 563.6 40.4 265.0 Stable or Increasing
Little Egret 6.2 114.6 930.0 Stable or Increasing

Species Analysis

Mute Swan

Trend (%)
Site 5 Year 12 Year 23 Year
Ballyallia Lake 55.7 23.9 70.3
National 4.6 9.6 13.8

Shoveler

Trend (%)
Site 5 Year 12 Year 23 Year
Ballyallia Lake 118.9 -25.7 -48.1
National 23.0 -21.3 -10.8

Gadwall

Trend (%)
Site 5 Year 12 Year 23 Year
Ballyallia Lake -17.9 7.8 -45.7
National -26.5 4.3 24.4

Wigeon

Trend (%)
Site 5 Year 12 Year 23 Year
Ballyallia Lake 12.4 -18.7 -24.3
National 0.9 -17.0 -18.2

Mallard

Trend (%)
Site 5 Year 12 Year 23 Year
Ballyallia Lake 35.6 -25.9 -56.0
National -11.3 -19.7 -19.1

Pintail

Trend (%)
Site 5 Year 12 Year 23 Year
Ballyallia Lake -10.9 9.3 1.0
National -0.8 -6.0 -13.7

Teal

Trend (%)
Site 5 Year 12 Year 23 Year
Ballyallia Lake 20.3 6.0 23.6
National 1.8 5.7 19.4

Pochard

Trend (%)
Site 5 Year 12 Year 23 Year
Ballyallia Lake 21.4 -90.9 -97.5
National -19.8 -60.4 -79.1

Tufted Duck

Trend (%)
Site 5 Year 12 Year 23 Year
Ballyallia Lake -1.4 -14.5 -5.3
National -20.7 -28.9 -17.9

Coot

Trend (%)
Site 5 Year 12 Year 23 Year
Ballyallia Lake 15.6 20.9 -24.6
National -10.1 1.1 -23.2

Little Grebe

Trend (%)
Site 5 Year 12 Year 23 Year
Ballyallia Lake -13.3 31.9 24.7
National 6.1 16.7 38.2

Great Crested Grebe

Trend (%)
Site 5 Year 12 Year 23 Year
Ballyallia Lake -33.6 -36.3 -31.0
National -39.5 -6.1 -10.8

Lapwing

Trend (%)
Site 5 Year 12 Year 23 Year
Ballyallia Lake 315.2 -39.4 -43.6
National -6.5 -45.1 -63.9

Curlew

Trend (%)
Site 5 Year 12 Year 23 Year
Ballyallia Lake -2.1 -3.1 -23.4
National -9.4 -23.7 -43.1

Black-tailed Godwit

Trend (%)
Site 5 Year 12 Year 23 Year
Ballyallia Lake 563.6 40.4 265.0
National 22.5 25.0 92.3

Dunlin

Trend (%)
Site 5 Year 12 Year 23 Year
Ballyallia Lake 170.0 -65.4 -92.4
National 5.9 -21.2 -45.2

Redshank

Trend (%)
Site 5 Year 12 Year 23 Year
Ballyallia Lake 170.7 11.0 -65.1
National -14.0 -28.4 6.7

Cormorant

Trend (%)
Site 5 Year 12 Year 23 Year
Ballyallia Lake -34.2 -42.7 -45.7
National 38.5 8.4 42.9

Grey Heron

Trend (%)
Site 5 Year 12 Year 23 Year
Ballyallia Lake 51.9 -24.1 -50.3
National 1.0 -4.9 6.6

Little Egret

Trend (%)
Site 5 Year 12 Year 23 Year
Ballyallia Lake 6.2 114.6 930.0
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)