Survey Details - Timed Tetrad Visits
Timed Tetrad Visits
The Timed Tetrad Visits (TTVs) method gathered records from tetrads (2 x 2-km squares) and were used to generate information on relative abundance of a species within a 10-km square.
The purpose of the survey was to map the distribution of all bird species, generate information on patterns of relative abundance, quantify distribution changes, inform conservation priorities, and engage a new generation of recorders.
The survey covered both Britain and Ireland, but only the Republic of Ireland subset of data are displayed.
Four winters and four summers from November 2007 to July 2011.
Hiqh quality. All data underwent rigourous data verification and validation.
Further information some of the key findings of the survey are presented on the BirdWatch Ireland website http://www.birdwatchireland.ie/OurWork/ResearchSurveys/Atlas/tabid/487/Default.aspx
BirdWatch Ireland, Bird Atlas 2007 - 2011, Survey: Timed Tetrad Visits, National Biodiversity Data Centre, Ireland, accessed 27 January 2022, <https://maps.biodiversityireland.ie/Dataset/220/Survey/507>
Survey species distribution
Terrestrial Map - 10kmDistribution of the number of species recorded within each 10km grid square (ITM).
Marine Map - 50KmDistribution of the number of species recorded within each 50km grid square (WGS84).
Survey records distribution
Terrestrial Map - 10kmDistribution of the number of records within each 10km grid square (ITM).
Marine Map - 50KmDistribution of the number of records within each 50km grid square (WGS84).
Records per year
Species per year