Sitta europaea – DELOR Y CNAU – Breeding resident
Comparison with previous atlas:
|No of tetrads occupied||199 (of 478)||214 (of 490)|
|Percentage of tetrads||41.6%||43.7%|
The Nuthatch is a sedentary bird, so it is likely that all summer records are of breeding birds. The estimate at the end of the survey of 1984-88 was made on this premise, suggesting an average density of three to four pairs per tetrad and a county population of 600 – 800 pairs. The higher of these figures accords with the average density used by the 1988-91 National Atlas to calculate the UK population.
Since then the BBS has indicated a 76% increase in Wales between 1994 and 2007. If the BBS findings are applied to the number of occupied tetrads registered by the survey of 2003-07, using a density of four pairs per tetrad, a population estimate of 1,500 pairs in Pembrokeshire emerges.
Graham Rees. Pembrokeshire County Bird Recorder 1981-2007
Records extracted from the Pembrokeshire Bird Reports, which may contain more detail than shown here.