The First Atlas of Wintering Birds i…

Occurrence dataset published by National Biodiversity Data Centre

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Full Title

The First Atlas of Wintering Birds in Britain and Ireland: 1981/82-1983/84.


A dataset of the distribution and abundance of the wintering birds in Britain & Ireland from 1981 to 1984, generated using a list of the species observed and counts of individuals seen within each 10km square over the survey period.


The records were collected to compile as complete a wintering species list as possible for each 10-km square and provide a count of the number of each species seen. The dataset was used to produce the first BTO/IWC Wintering Birds Atlas (Lack P. (1986) The atlas of wintering birds in Britain and Ireland. T. & A.D. Poyser).

Additional Information

Full details of the methods used in the field, how fieldwork was organised and the interpretation of the maps is provided in the published atlas Lack, P. (1986) The Atlas of Wintering Birds in Britain and Ireland. T. & A.D. Poyser, Calton, or from the British Trust for Ornithology website at Specific queries as they relate to the Republic of Ireland should be made to BirdWatch Ireland at

Temporal coverages

Date range: Jan 1, 1981 - Jan 1, 1984

Language of Metadata


Language of Data


Olivia Crowe
BirdWatch Ireland Unit 20, Block D, Bullford Business Campus, Kilcoole, Co. Wicklow, Ireland Ireland 353 (0)1 2819878
Metadata author
National Biodiversity Data Centre, Ireland Beechfield house, Carriganore WIT West Campus Waterford County Waterford Ireland +353 (0)51 306 240
Administrative contact
Barry O'Neill
National Biodiversity Data Centre, Ireland Beechfield house, Carriganore WIT West Campus Waterford County Waterford Ireland +353 (0)51 306 240


Published by

National Biodiversity Data Centre

Publication Date

Jul 28, 2017

Registration Date

Jul 4, 2011

Served by

HTTP Installation


External Data

Metadata Documents

55,690 Georeferenced data

View records

All records | In viewable area


This datasets contains data only for the island of Ireland, but is part of the larger Britain and Ireland mast… more


What does this map show?


Quality control

The maps as published are considered a true representation of the distribution and relative abundance of each species at a national level during the survey period. There will be some gaps in individual squares, especially for some of the more elusive and rarer species and some bias due to observer intensity.

Method Steps

  1. Specific fieldwork was conducted by mainly volunteer observers although professional help was used in some remoter areas.Two methods of fieldwork were requested from observers:1) Specific timed visits. An observer visited a 10-km square for a minimum of one hour and was asked to count all the individual birds seen in that time. At the end of the project these counts were standardized to a 'day' defined as 6 hours in the field by using a regression of numbers seen on time spent on a species specific basis.2) Supplementary Records. Observers were encouraged to send in any and all records of counts of species from 10-km squares. In particular these records were of species not seen on timed visits and those involving high numbers.The final published maps used the maximum count in a day over all three winters of each species divided into 3 levels such that 50% of positive records were placed in the lowest category (1), 30% in the middle category (2) and 20% in the highest category (3).