Green Woodpecker – 2003-07 breeding

Picus viridis – CNOCELL WERDD – Breeding resident

Comparison with previous atlas:

1984-882003-07
Breeding confirmed353
Breeding probable6520
Breeding possible399
No of tetrads occupied139 (of 478)32 (of 490)
Percentage of tetrads29.1%6.5%

During the 20 year period between 1984-88 and 2003-07 there has been a quite dramatic decline in Green Woodpecker distribution across Pembrokeshire, indicated by a 77% decrease in the number of tetrads in which they were found. This decline is contrary to the BBS population index, which appears to indicate an overall 48% increase across Wales as a whole between 1994 and 2007. Within Pembrokeshire, the population appears to have shrunk towards the south and south-east. Apart from some outliers on the St David’s peninsula and in the Gwaun Valley, they now appear to have all but disappeared in the north.

Examination of the 1988-91 National Atlas is also revealing. Pembrokeshire and other counties in Wales (and also notably in Cornwall), recorded many more 10 km-squares with losses of confirmed breeding Green Woodpeckers, than  gains between the first national breeding birds atlas (1968–72) and the second atlas, 20 years later. This seems to much more closely represent the trends found in the local atlas, compared with the BBS population index. Even from the 1984-88 atlas survey, Donovan and Rees regarded the Green Woodpecker distribution as patchy across the county. They estimated that the average density may have been as high as one to two pairs per occupied tetrad and suggested a population then of about 140 – 280 pairs. Translating this to 2003-07 would therefore suggest a population of about 32 – 64 pairs. Even this seems to be a high number, considering how difficult they were to find during the five years of atlas fieldwork.

Up to 2007 at least, Stackpole National Nature Reserve, on the Castlemartin peninsula remained as one of their most reliable breeding areas, where one or two pairs regularly nested during the atlas survey period. Here there are still reasonably healthy ant populations in unimproved invertebrate-rich dune and maritime grassland, supporting yellow ant hills at a density of up to 550 per hectare. Green Woodpeckers feed over Stackpole Warren but have also been found searching for food in the limestone-crevices on the sea cliffs. 

Just why Green Woodpeckers appear to be in steep decline in Pembrokeshire is unknown. Recent on-line species maps, from the early period of the 2007 – 11 joint national winter and breeding atlas is also revealing. Provisional distribution maps suggest that there has been a contraction in their population in Wales. This is particularly evident in neighbouring Ceredigion to the north, where breeding evidence is fairly patchy and they also appear to be largely absent from west Carmarthenshire.

Is climate an issue? Could changes in grassland management have led to a loss of invertebrate prey, especially ants? Could this be subtly linked to local declines in the Rabbit population since the arrival of viral haemorrhagic disease in the early 1990’s, on top of already established seasonal outbreaks of myxomatosis? Have there been subtle changes in woodland management that may be a contributing factor? Whatever the reason or combinations of factors involved, further local research is needed to identify the main causes and to see if positive management can be introduced to halt the decline.   

Bob Haycock (BTO rep & Chairman of the Pembs Bird Group)

Records extracted from the Pembrokeshire Bird Reports, which may contain more detail than shown here.

More about the Green Woodpecker in Pembrokeshire

Green Woodpecker – 1994

Picus viridis – CNOCELL WERDD – Breeding resident

1984-88
Breeding confirmed35
Breeding probable65
Breeding possible39
No of tetrads occupied139 (of 478)
Percentage of tetrads29.1%

Mathew (1894) regarded the Green Woodpecker as a common resident. Lockley et al. (1949) noted a considerable decrease following and probably caused by the severe winter of 1947. More recently, hard weather, in particular the winter of 1963, has had a similar effect, but by 1964 areas were being recolonised which had been deserted since the 1930s.

The Breeding Birds Survey of 1984-1988 found a patchy distribution (see map). With an estimated average density of one to two pairs per tetrad, the Pembrokeshire population would be about 140-280 pairs.               

Green Woodpeckers are not normally seen far outside the breeding range but they have occasionally turned up on Skomer between July and September and have once been seen crossing from Giltar to Caldey.

Donovan J.W. & Rees G.H, 1994, Birds of Pembrokeshire

More about the Green Woodpecker in Pembrokeshire

Green Woodpecker – 1980s winter

Picus viridis – CNOCELL WERDD – Breeding resident

The BTO winter atlas showed that Green Woodpeckers were present in most 10km squares of their known breeding range during the winters of 1981-82, 1982-82 and 1983-84.

The darker the colour, the higher the relative total count for each 10km square.  The darkest blue represents over 3 birds seen in a day.

Graham Rees. Pembrokeshire County Bird Recorder 1981-2007

Data collected by volunteers for the BTO. Lack, P. 1986 Atlas of wintering birds in Britain and Ireland. T & A.D. Poyser.

More about the Green Woodpecker in Pembrokeshire

Green Woodpecker – 1894

Gecinus viridis – A common resident.

This is the only common Woodpecker in the county, and has been seen by us in all parts of it where there are trees. It is very common at Stone Hall, where we always had a nest close to the house, and where the cry of the bird was so incessantly heard throughout the spring and summer that we ceased to regard it as being in any degree a weather sign. Mr. Dix states that in his district it was common in the wooded dingles, and more so where there are old trees, particularly ash.

With us the bird generally placed its nest in a decayed sycamore, and we were astonished one day at the heat communicated by the young birds to the wood when we put our hand on the tree just beneath the entrance hole to the nest. Many trees are worked upon by the birds before they finally select the site for the nest; they doubtless find some of them harder than they expected, and, after boring them to some depth, leave them for a softer and more decayed tree.

Mathew M.A. 1894, Birds of Pembrokeshire and its Islands

More about the Green Woodpecker in Pembrokeshire

Green Woodpecker

Picus viridis – CNOCELL WERDD – former breeder

Green Woodpecker – 2016

Picus viridis – CNOCELL WERDD – No longer a breeding bird, only rare sightings. Source: Pembrokeshire Bird List (2016) edited by Mike Young-Powell on behalf of the Pembrokeshire Bird Group. More about the Green Woodpecker in Pembrokeshire

Green Woodpecker – 2003-07 breeding

Picus viridis – CNOCELL WERDD – Breeding resident Comparison with previous atlas: 1984-88 2003-07 Breeding confirmed 35 3 Breeding probable 65 20 Breeding possible 39 9 No of tetrads occupied 139 (of 478) 32 (of 490) Percentage of tetrads 29.1% 6.5% During the 20 year period between 1984-88 and 2003-07 there has been a quite […]

Green Woodpecker – 1994

Picus viridis – CNOCELL WERDD – Breeding resident 1984-88 Breeding confirmed 35 Breeding probable 65 Breeding possible 39 No of tetrads occupied 139 (of 478) Percentage of tetrads 29.1% Mathew (1894) regarded the Green Woodpecker as a common resident. Lockley et al. (1949) noted a considerable decrease following and probably caused by the severe winter of 1947. […]

Green Woodpecker – 1980s winter

Picus viridis – CNOCELL WERDD – Breeding resident The BTO winter atlas showed that Green Woodpeckers were present in most 10km squares of their known breeding range during the winters of 1981-82, 1982-82 and 1983-84. The darker the colour, the higher the relative total count for each 10km square.  The darkest blue represents over 3 birds seen […]

Green Woodpecker – 1894

Gecinus viridis – A common resident. This is the only common Woodpecker in the county, and has been seen by us in all parts of it where there are trees. It is very common at Stone Hall, where we always had a nest close to the house, and where the cry of the bird was so incessantly heard throughout […]