New Hertfordshire Bird Atlas
Starting in November 2007 and running for four years, the Herts Bird Club will be collecting data to produce a new county bird atlas, surveying all
491 tetrads (2km x 2km squares) that include part of the county. This project will run alongside, and use the same methods as, Bird Atlas 2007-11 - the
British Trust for Ornithology / BirdWatch Ireland / Scottish Ornithologists Club atlas of the birds of the whole of Britain and Ireland.
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The populations and distributions of Britain's birds are in a constant state of flux, as changes in the habitat and climate impact all aspects of their
lifecycle. Only by monitoring where, when and in what numbers are our birds using the variety of habitats and resources within the county can we
hope to understand these impacts.
Annual monitoring schemes, such as the BTO/RSPB/JNCC Breeding Bird Survey (BBS) operate by counting birds in randomly selected squares and provide yearly
measures of population change. At the county level this gives only a broad indication of the changes in a relatively small number of species. Atlas projects
complement the BBS by providing comprehensive information on the distribution of birds, covering far more squares than BBS.
The new Hertfordshire atlas will comprise the first systematic assessment of the distribution of birds in the county in
winter and the third breeding season atlas, updating the distribution maps for 1988-92 published in The Breeding Birds of Hertfordshire and
reproduced in interactive format on this website.
March 2012 Data Refresh and Final Breeding Season Starts
This website has been refreshed to include all winter season data entered to the Bird Atlas 2007-11 website by 21 March 2012. This includes Timed Tetrad Visit data for this season that was entered online. Please send or enter any outstanding winter records as soon as possible.
Fieldwork for the fifth and final breeding season starts on 1 April. Although a few Timed Tetrad Visits reman to be completed, the focus for this season is improving the breeding status. The Breeding Season species density map and Confirmed Breeding evidence map show where the gaps are.
27 March 2012
February 2012 Data Refresh
This website has been refreshed to include all breeding and winter season data entered to the Bird Atlas 2007-11 website by 13 February 2012. This includes Timed Tetrad Visit data for this season that was entered online. The winter species density map and breeding species density map show the numbers of species recorded in each tetrad and where we still have gaps.
Fieldwork for the 10km scale national atlas has now finished, although we will be continuing to collect tetrad-level records for the county atlas in the 2011/12 winter season and the 2012 breeding season.
18 February 2012
Volunteers' Newsletter 6 Now Available
With winter season fieldwork starting on 1 November, the latest Volunteers' Newsletter is now available. Please take the time to read this to see what we have achieved so far and understand our priorites for this winter.
8 November 2011
Rare Species Policy Revised
At a recent meeting of the Herts Bird Club Scientific Committee, it was decided to relax some of the mapping restrictions that had been applied when this website was first launched. There was concern that by restricting maps to the 10km scale, we may be losing tetrad records for some species. The list of species that are mapped at the 10km level, or not at all, was reviewed and the risk of revealing the tetrad-level breeding status was assessed. Consequently, the breeding season maps for the following species now show records at the tetrad level: Gadwall, Shoveler, Pochard, Little Egret, Red Kite, Barn Owl, Kingfisher, Lesser Spotted Woodpecker and Cetti's Warbler.
29 April 2011
