Pembrokeshire Avifauna

They were recorded in every winter from 1983 to 2006 with the exception of 1992. Only one was reported in the winter in 1989, two in 1985 and five in 1986. Groups which did not stay for long were: 55 at the Gann on the 7th February1954, 60 there on the 13th January 1963, 30 Pen y Cwm on the 27th January 1963 and 36 Furzenips on the 27th January 1996.

Even at the most favoured parts of the Cleddau Estuary, Angle Bay and the Pembroke River, they have seldom endured for long. The largest county presence of 500 at the Pembroke River on the 22nd January 1972 was only recorded on that date. A further 185 there in December 1999 had decreased to just nine by January 2000. Similarly 65 at Angle Bay in January 1987 had reduced to two by the 15th February.

Full overwintering has been recorded twice to date (up to 2006). About 85 were present from December 1996 to February 1997 using both Angle Bay and the nearby Pembroke River, whereas 24 at Angle Bay in December 2005 had increased to 70 by January 2006 with 80 by February.

It is established that Knots move between different estuaries in the UK during the winter in response to variable food availability, so it is possible that those occurring in winter in Pembrokeshire could have come from parts of Carmarthen Bay or the Burry Inlet, moving on if the local food supply was limited. This is speculation for there is no evidence that this happens, appropriate ring recoveries could provide confirmation.

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GHR,

Wader,

winter in

Knot

Monday

Jan102011

Knot - status

Monday, January 10, 2011 at 7:47PM

Calidris canutus

Passage migrant and winter visitor.

The Knot has a circumpolar Arctic breeding distribution and winters in temperate and tropical areas. International studies have established that most Knots occurring in Britain are of the race islandica, which breeds in Greenland and the Canadian Arctic.

The nominate race canutus, breeding in the Old World Arctic, could conceivably occur occasionally in Pembrokeshire, perhaps in those years when there is a large influx of Little Stints and Curlew Sandpipers which share a similar breeding range.

Mathew (1894) considered the Knot to be an autumn and winter visitor to Pembrokeshire, appearing on the flats and oozes at the end of August and beginning of September. He gave no indication of the numbers involved but noted it as being seen commonly every autumn near Pembroke, also on the sands at Goodwick.

Lockley et al (1949) also classified the species as an autumn and winter visitor, usually seen in small parties of less than 20 birds but occasionally in larger groups, noting 100 at Dale on the 6th November 1938.

Post 1949 the Knot has principally remained an autumn migrant but has overwintered and there has been a small and regular spring passage.

References

LOCKLEY. R. M, INGRAM. C. S. and SALMON. H. M.1949. The birds of Pembrokeshire, West Wales Field Society.

MATHEW. M. 1894. The birds of Pembrokeshire and its islands, R. H. Porter.

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GHR,

Migrant,

Wader,

winter in

Knot

Tuesday

Dec282010

Spotted Redshank - winter

Tuesday, December 28, 2010 at 5:51PM

Tringa erythropus

There were two winter records in the 1960’s and just one winter record during the 1970’s. It was in January 1983 that over wintering was first detected, ten birds feeding around the upper Cleddau Estuary between Landshipping / Sprinkle Pill and Hook, including Millin Pill, staying until the 17th April. These birds habitually kept together feeding communally, usually in deeper water than used by Redshanks and Greenshanks, sometimes upending like dabbling ducks. Variously five to 16 over wintered in that area each year up to 1991, departing in March. During this 10 year period there were winter records of one or two birds in four years from other parts of the Cleddau Estuary, most of them at Carew / Cresswell.

Post March 1992 fewer wintered on the upper Cleddau Estuary than previously but one to five did so elsewhere in the estuary system, principally at Carew / Cresswell and Sandy Haven Pill but they were also noted at Cosheston Pill, Castle Pill, Pembroke River and the Gann.

WINTER DISTRIBUTION IN CLEDDAU ESTUARY, blue = lower estuary, red = upper estuary.

During the period 1983 – 1992 just 11 % of winter records were away from the upper Cleddau Estuary but between 1993 and 2006 this had risen to 46 % and the total over wintering in the estuary as whole had decreased by 40 %. Reasons for the decline in winter numbers and local dispersal are speculative, the front runners being the cessation of raw sewage discharge into the Cleddau Estuary and a build up of wintering birds at Penclacwydd, Carmarthenshire, resulting in fewer travelling further west to Pembrokeshire. The latter is credible, for if the numbers wintering at Penclacwydd (provided by Wendell Thomas pers com) post 1992 are combined with those on the Cleddau Estuary for the same years, an average of nine birds per annum overwintered. The average overwintering on the Cleddau prior to the creation of the Penclacwydd wetland was 10.6.

All winter records were confined to the Cleddau Estuary and constituted 55.6 % of the county total.

Graham Rees

(Covers records up to and including 2006).

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tagged

Cleddau,

GHR,

Wader,

distribution,

winter in

Spotted Redshank