1980s BTO Winter Atlas

The Winter Atlas maps 200 species occurring in Britain and Ireland in winter.  The maps are derived from surveys of birds present in Britain and Ireland during the three winters, 1981/82, 1982/83 and 1983/84.  The surveys were organised by the British Trust for Ornithology and the Irish Wildbird Counsevancy, as were the earlier breeding birds surveys.

The maps reproduced here for species occurring in Pembrokeshire use the same “assessment of relative abundance” as the original maps, but are shown as light, mid and dark blue instead of different sized dots.  For example, a map with light blue squares only indicates that the species is more abundant elsewhere in Britain. All maps presented for this survey are at 10-km square (Hectad resolution). A maximum of 32 10-km squares cover the Vice County. This includes partial ones along boundaries with neighbouring counties Carmarthenshire and Ceredigion and along the coast, but excludes Grassholm.

Detail of the methodology, and the results for the whole country, are to be found in: Lack, P.C. (1986) The atlas of wintering birds in Britain and Ireland. T. & A.D. Poyser and national maps for individual species can also be accessed from the drop-down list at the bottom of the BTO Atlas page.

All the Pembrokeshire maps can be accessed by clicking here or on the “1980s BTO winter atlas” tag below. 

Green Sandpiper – 1980s winter

Tringa ochropus – PIBYDD GWYRDD – Passage migrant and winter visitor

The BTO winter atlas showed that Green Sandpipers were present in two estuarine 10km squares during the winters of 1981-82, 1982-82 and 1983-84.

The colour represents single birds seen a day. The UK is at the northern extremity of the winter range of this species.

Graham Rees (County bird recorder 1981 to 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 Sandpiper 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 (County bird recorder 1981 to 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

Pink-footed Goose – 1980s winter

Anser brachyrhynchus – GWYDD DROED BINC – Rare visitor

The BTO winter atlas showed that 1-2 Pink-footed Geese were noted in two Pembrokeshire 10km squares, at The Gann and Marloes Mere, during the winters of 1981-82, 1982-82 and 1983-84.

Graham Rees (County bird recorder 1981 to 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 Pink-footed Goose in Pembrokeshire

Greenshank – 1980s winter

Tringa nebularia – PIBYDD COESWERDD – Winter visitor and passage migrant

The BTO winter atlas showed that Greenshanks were present in six estuarine 10km squares during the winters of 1981-82, 1982-82 and 1983-84.

The darkest colour represents over 6 birds seen a day. It is likely that the birds concerned were Scottish breeders.

Graham Rees (County bird recorder 1981 to 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 Greenshank in Pembrokeshire

Pintail – 1980s winter

Anas acuta – HWYADEN LOSTFAIN – Winter visitor and passage migrant. Has bred

The BTO winter atlas showed that Pintails were noted in five mainly estuarine 10km squares 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 4-29 birds seen in a day.

Graham Rees (County bird recorder 1981 to 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 Pintail in Pembrokeshire

Grey Wagtail – 1980s winter

Motacilla cinerea – SIGLEN LWYD – Breeding resident

The BTO winter atlas showed that Grey Wagtails were present in most 10km squares 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 4 birds.

The map plot shows a slightly wider winter distribution than that of the breeding season.

Graham Rees (County bird recorder 1981 to 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 Grey Wagtails in Pembrokeshire

Pochard – 1980s winter

Aythya ferina – HWYADEN BENGOCH – Winter visitor and passage migrant, has bred

The BTO winter atlas showed that Pochards were noted in 10km squares containing suitable fresh water sites 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 95 birds seen in a day. 

Up to 462 were recorded at Bosherston, the principal locality for this species.

Graham Rees (County bird recorder 1981 to 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 Pochard in Pembrokeshire

Greylag Goose – 1980s winter

Anser anser – GWYDD WYLLT – Erratic visitor. Not recorded from July to September

The BTO winter atlas showed that Greylag Geese were present in two 10km squares during the winters of 1981-82, 1982-82 and 1983-84, presumed birds of feral origin.

Graham Rees (County bird recorder 1981 to 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 Greylag Goose in Pembrokeshire

Raven – 1980s winter

Corvus corax – CIGFRAN – Breeding resident

The BTO winter atlas showed that Ravens were present in most 10km squares 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 74 birds seen in a day.

The largest roost recorded during this period contained 160 birds.

Graham Rees (County bird recorder 1981 to 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 Raven in Pembrokeshire