Marsh Harrier – 2011

Circus cyaneus – BOD TINWENScarce passage migrant, winter visitor and former breeder.

The Marsh Harrier breeds throughout the Western Palearctic, wintering southwards as far as Africa but it is resident in some areas.

Said to be formerly a common resident in Pembrokeshire, it had become a rare visitor by the time of Mathew (1894). How rare can be judged by there being only eight recorded occurrences between 1880 and 1941. Eighteen individuals were noted between 1942 and 1980, an increase that cannot be entirely due to a growth in the number of active observers.

From a single pair in 1971, the British breeding population increased by about 20 % per year to reach a minimum of 363 pairs by 2005. Although Pembrokeshire is peripheral to the main breeding area in eastern England and the species remained scarce in the county, its frequency of occurrence increased during the British population expansion.

A pair summered in both 2010 and 2011 but breeding was not proven.

Cumulative monthly totals up to 2011.

Peak passage periods were April and May in spring and August and September in autumn. Apart from one seen near St David’s on the 2nd January 1955, there have been two over wintering birds, at the Dowrog in 1982/83, Marloes Mere in 1994/95 and at Castle Martin in 2009/10.

The only adult males recorded were: at Stone Hall in 1880, Ramsey on 20th May 1953, Skomer on the 3rd April 1984 and 24th – 25th April 1997, Trefeiddan on the 8th April 1984, the Gann on the 2nd March 1994 and 29th March 1995, Skokholm on the 3rd May 2001, Hendre, St David’s, on the 4th May 2001, the Dowrog on the 13th November 2003 and one half of the possible breeding pair in 2010 and 2011.

Most Marsh Harriers recorded were at or near the coast, from the Ceredigion border to Tenby, most frequently at the Teifi Marshes, St David’s area, Skomer and Marloes Mere.

Records from further inland were: Stone Hall in 1880, shot at Loveston in c.1884, Jordanston Moor prior to 1894, Mynydd Preseli on the 14th August 1929, Thornton on the 12th May 1971, Treffgarne on the 29th September 1996, Clarydale on the 15th April 1997 and Haverfordwest Race Course on the 10th October 2002. It should be noted that the bulk of observer attention has been focussed on the coastal strip.

Marsh Harriers seen migrating through the county have often hunted on the way, particularly pausing at wetlands, heath and moor but have also been seen quartering barley fields. Many followed the line of the coast but one was seen flying northwards out to sea at Strumble Head on the 6th May 2001 and another coming in off the sea from the north on the 3rd November 1996. A female was seen to depart eastwards from Marloes Mere on the 26th April 1987 steadily gaining height and was at an estimated altitude of 500 feet when finally lost to sight.    

Graham Rees. Pembrokeshire County Bird Recorder 1981-2007

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Long-tailed Duck – 2011

Clangula hyemalisHwyaden Gynffon-hirErratic winter visitor and passage migrant.

Long–tailed Ducks have a circumpolar arctic and sub arctic breeding distribution, normally the nearest nesting to the UK being in Norway and Iceland. They winter out to sea but to a lesser extent along coasts, entering estuaries and sometimes visiting fresh waters.

The first to be recorded in Pembrokeshire was a male in summer plumage shot near Haverfordwest on the 15th June 1843, chronicled by Mathew (1894) who also noted that two immature birds were shot on the Stackpole Estate but quotes no dates.

Coincidentally the next to be recorded was also in June, shot within the Milford Haven waterway on the 7th in 1906. There followed recordings in three years during the 1950’s, four in the 1960’s, five in the 1970’s and in every year from 1980 to 2006.

Most long-tailed ducks were found within St Bride’s Bay and in the Pembrokeshire corner of Carmarthen Bay. Others around the coast at Pwllgwaelod, Fishguard Harbour, Strumble Head, St David’s Head, Ramsey, Skomer and Skokholm.

Also in the Teifi Estuary (once three and a half miles upstream), within the Cleddau Estuary at Landshipping/Picton Point, Carew, Westfield Pill, Llanstadwell, Sandy Haven and the Gann, and on fresh water at Heathfield Gravel Pits, a pond close to St Bride’s Haven, Bosherston and Llys y fran Reservoir.

Most sightings were of one or two birds at a time but four were at Llys y fran Reservoir on the 18th November 1973, five at Strumble Head 6th January 1973, three there 20th December 1981 and on 21st October 1984, three Broad Haven (north) 3rd – 21st January 1969, three Amroth/Saundersfoot 9th March 1991, 14th – 24th December 1994, 2nd January – 4th March 1995 and 6th January 1999, with four there 20th April 1984, 7 from 29th December 1990 to 10th January 1991 and up to 12 from 29th January to 9th April 1989.      

Monthly distribution: 1843 – 2008.

Some were seen on one date only but many remained in the same area throughout the winter, sometimes until March or April. One remained at the Gann from the 2nd January to the 23rd July in 1983. A male which was first seen at Pembroke Mill Ponds on the 24th December 2001 stayed until the 11th August 2004. This well watched bird frequently took bread offered to the local Mute Swans and Mallards, duly went through moults between winter and summer plumages and was thought to have taken brief sabbaticals at Westfield Pill on 7th and 8th August 2002 and 2nd September 2003.

The number noted each year has varied, illustrated by the longest unbroken sequence of years being depicted graphically:

Just one bird recorded in the years 2005 and 2006 was the first time this occurred sequentially in this 27 year series, which if coupled with none being recorded in 2007 and 2008, may be an early indication that fewer Long – tailed Ducks are coming as far south as they did formerly.

The majority winter within the Arctic region, often in close proximity to the pack ice and climate change is causing the ice to recede, so it is possible less may travel as far south as they did in the past as more open water becomes accessible at higher latitudes.

More about the long-tailed duck in Pembrokeshire

Little Tern – 2006

Sternula albifronsMôr-wennol FechanScarce passage migrant. Not recorded from December to March or July

Little Terns breed from Britain eastwards into Europe and central Asia and south as far as North Africa and India. They nest on both sides of the Irish Sea and along the west coast of Scotland with just one colony in Wales, post 1989, in Flintshire. Those seen in Pembrokeshire probably originate from these Irish and west coast colonies.

The Little Tern was considered to be an occasional passage migrant by Mathew (1894) and Lockley et al (1949), whereas Donovan and Rees (1994), with the benefit of increased observer cover, concluded it was a scarce passage migrant seen in most years.

Little Terns have been recorded around the coast at Fishguard, Strumble Head, Abermawr, St David’s Head, Solva, Newgale, Broad Haven (North), Skomer, Skokholm, St Govan’s Head, Tenby and Caldey, further out to sea at Grassholm and The Smalls, inside the Teifi and Nevern Estuaries and within the extensive Cleddau Estuary  at the Gann, West Williamston and Picton Point. All were seen over salt water except for singles at Bosherston on the 31st August 1937 and on the 8th September 1993

Spring – There have been only 15 records in the spring, between 14th April and 24th June, having been seen eight times in April, three times in May and four times in June. All were occurrences of one or two birds at a time except for six in Solva Harbour on the 8th May 1916.

Autumn – The Little Tern has predominantly been seen in the autumn, between 30th July and 6th November. There has been about an equal volume of records for August and September, with fewer in October and just one July occurrence, at The Smalls on the 30th, and singles were seen Tenby on 6th November 1961 and Skokholm on 1st and 6th November 1980. Most records were of one to three birds at a time but larger groups have been seen on 17 occasions, the largest being 23 at Skomer on the 17th September 1992.

Graham Rees. Pembrokeshire County Bird Recorder 1981-2007

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Garganey – 2011

Anas querquedula – HWYADEN ASSFAINPassage migrant. Not recorded in November or December

The Garganey is a summer visitor to north and west Europe, which largely winters in southern Africa. Migration to winter quarters occurs late July to October, peaking through Europe in August and early September, with stragglers from November to February. Return movement begins in February, with the main passage through Europe from March to April. It is a scarse breeder in the UK.

Mathew (1894) described the Garganey as an annual summer visitor, while Lockley et al.(1949 ) provided four additional records of 10 birds.

Donovan and Rees (1994) stated the Garganey was almost annual in occurrence, usually occurring on fresh waters near the coast, such as Trefeiddan and Marloes Mere, between March and June, less regularly from July to October.

So far there has been no evidence of breeding in Pembrokeshire.

Spring passage has been recorded from the 8th March to the 11th June. One to four birds at a time have been noted but six together were at Newgale on the 16th March 1959. Eight birds in two years were recorded in spring during the 1950’s. Subsequent records are shown in graph form.

Single birds have been recorded in 17 years during autumn, up to 2011, between the 23rd July and the 26th September, plus one at Orielton on the 24th October 1939 and one at Skomer on the 28th November 2005.  

In winter Mathew (1894) recorded three shot at Pen y cwm on the 28th February 1888, Lockley et al noted captures at the Orielton Decoy on the 14th February and 22nd February 1889 and four were seen from a boat in Dale Roads on the 10th January 1968.

Garganey – Habitat

Frequents shallow fresh water with extensive cover, using salt water areas temporarily while on passage.

Pembrokeshire records relate to occurrences at fresh water sites at Marloes Mere, Trefeiddan, Treleddyn, Dowrog, Newgale Marsh, Orielton, Bosherston, Skokholm, Skomer, Thornton  Reservoir (now defunct), Pembroke Mill Pond, Teifi Marsh, Westfield Pill, “Esso” (Herbranston), Orielton, Goodwick Moor, Rosemoor, Nine Wells and Ivor’s Pond.

Birds in transit have been noted on or over saline and salt water at Hook Reach, Nevern Estuary, Dale Roads, Gann, off Skomer and at Strumble Head.

Garganey – Discussion

Several factors make it likely that the Garganey has probably been under recorded. It tends to keep within cover at its favoured fresh water sites, such unobtrusiveness suggesting it is easily overlooked.

Good views are necessary to separate females from the similarly plumaged Teal at all seasons, this also applying to juveniles in the autumn and even to males in moult that are not seen in flight. 

Graham Rees. Pembrokeshire County Bird Recorder 1981-2007

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Corncrake – 2011

Formerly bred, now a scarce passage migrant. Not recorded in November, January or February

Breeding

Formerly a common and widespread breeding summer visitor to Pembrokeshire, as noted by George Owen in 1603 and Murray Mathew in 1894, the Corncrake has subsequently decreased and then disappeared as a nesting species.

The decline in the breeding population was underway by the beginning of the 20th century, accelerating after World War II when the introduction of mechanical mowers and the application of drainage and fertilisers permitted early cropping of hay, all of which resulted in low chick survival. The later widespread conversion from hay to silage further made farmland no longer suitable habitat for nesting Corncrakes.

Lockley et al. (1949) noted a decline in numbers from about 1916. B. Lloyd still found them in widespread localities in 1927, noting that at that time they were commoner in Pembrokeshire than they were in south-east England where the decline had set in earlier. By 1930 he noted that they were decreasing, only one or two being recorded each year, usually in September, with about equal frequency from the islands of Skokholm and Skomer and mainland sites such as Carreg Wasted, Llangloffan Fen and Pwllcrochan.

The decline continued, though K. J. S. Devonald could still encounter them around St Ishmaels in the late 1940’s and early 1950s, hearing them calling in the fields and becoming exposed at hay making time.

Nesting became increasingly sporadic: four or five clutches were revealed during silage cutting at Thomas Chapel in May 1962, from which the farmers reared three young that were released at Dale airfield. They were present in the breeding season at Uzmaston in 1965 and 1966 and at Pembroke in 1973. The BTO breeding bird atlas for 1968-72 noted confirmed breeding in 10Km squares SS19 and SN10, probable breeding in SN11 and SN04, with possible breeding in SN03 and SM72. No subsequent records have suggested breeding.

Migration

From the early 1980s onwards the Corncrake in Pembrokeshire had become a less and less frequent migrant visitor, briefly stopping off en route from African wintering grounds to northern breeding localities. The graph indicates how few have been recorded and indicates a trend towards less frequent occurrence. Notably none were reported from farmland.

Historic records show that Corncrakes have appeared as early as the 14th of March and stayed on as late as the 10th of December. Passage times since the cessation of breeding have been from the 24th of April to the 3rd of June and from the 27th of July to the 1st of November.

Stuart Devonald & Graham Rees

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Little Auk – 2010

Alle alleCarfil BachOccasional visitor.

The Little Auk is a high Arctic bird breeding westward from the Bering Sea to Baffin Island. Wintering areas include the Norwegian Sea, northern North Sea, Iceland and Greenland waters. Migratory and dispersive Little Auks have occurred as far south as France, the Mediterranean, Madeira and the Azores.

Recorded occurrences in Pembrokeshire have increased over time, from 30 occasions between 1880 and 1981 to 137 times between 1982 and 2006. This is most likely a reflection of observer activity rather than a change in status. Most have involved birds being pushed near to shore by strong winds.

The largest incursion may well have been in February 1950, when the West Wales Field Society reported “many washed up dead on the coast”, one was picked up near Haverfordwest on the 11th February and the remains of at least 13 were found on Skokholm when the island was re-occupied in April. These were part of a “wreck” affecting the south west of Britain and Ireland between the 8th and 11th February, following powerful south west winds. 

Subsequent records have related to very small numbers, 75% involving sightings of single birds but eight were noted on the 1st October 1995, 13 on 24th September 1995 and 21 on 20th November 1983. Mostly live birds, but some dead or moribund, have been recorded at many places around the coast from Amroth in the south to Newport Bay in the north. They have also been recorded from the offshore islands of Ramsey, Skomer and Skokholm and further out to sea around The Smalls. Singles have been found beyond the outer coast at Fishguard Harbour, the Gann/Dale, Angle Bay, Pembroke, Haverfordwest , Keeston, Walwyn’s Castle, Clarbeston and Trecwn.

Cumulative totals by month of occurrence.

The earliest date recorded was of one passing Strumble Head on the 10th September 1987, the latest one at St Govans’s Head on the 30th May 1983. The majority (79 %) recorded between 1983 and 2006 were from Strumble Head, reflecting the intensity of seawatching at that locality. 

Occurrences on the west coast of Britain seem to bear no relationship to the not infrequent “wrecks” of large numbers along English North Sea shores. The Norwegian Sea into the North Sea, almost south to the Dogger Bank, is a major wintering area and prolonged strong winds from the north could be expected to push Little Auks further south into the funnel shaped southern North Sea. Such winds would be unlikely to result in a westerly displacement of these birds into the Atlantic but might well affect birds wintering in the Iceland and Greenland sea-area. These would find themselves pushed into the wide Atlantic where they could conceivably become dispersed, or if still concentrated to any degree be a long way from land. Subsequent strong westerlies could push some of these into Irish and western British waters but events documented so far suggests that, with no known concentrations in adjacent areas, would result in small numbers being involved. The largest numbers involved, as in 1950, were small compared to southern North Sea incursions. It also seems relevant that birds reaching the south western area would have travelled over four times the distance from known wintering areas than those in the southern North Sea would.

Graham Rees. Pembrokeshire County Bird Recorder 1981-2007

More about the Little Auk in Pembrokeshire

White-tailed Eagle – 2010

Haliaeetus albicillaEryr y MôrVagrant

The White-tailed Eagle breeds in SW Greenland, W Iceland; N & C Eurasia S to Greece and Turkey, S Caspian Sea, L Balkash and Manchuria, wintering S to N Mediterranean, Persian Gulf, Pakistan, N India and SE China.  

35-44 pairs were nesting in Scotland by 2008 following introduction schemes started in 1975.

An immature was shot on the 2nd of February 1908 by B.Edwards near Whitchurch in Mynydd Preseli. It was reported as a Golden Eagle in “The Cardigan and Tivy-side Advertiser”. However on the 13th June 1928 B. Lloyd and C. Oldham were able to inspect the specimen and identify it as a White-tailed Eagle.

A 2nd or 3rd winter bird was seen at Skomer on the 10th and 11th November 1993 which departed along the line of the southern shore of St Bride’s Bay but was not seen again.

The 1908 bird must have been an immigrant as none were then breeding in the UK. The 1993 bird may also have been an immigrant but could have come from the Scottish population.

Graham Rees. Pembrokeshire County Bird Recorder 1981-2007

Rare breeding birds in the UK in 2008, British Birds Vol. 103, 507.

White-tailed Eagle in Pembrokeshire, British Birds, Vol. 35, 230.

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Corn Bunting – 2009

Former breeding resident. Now a scarce visitor

The Corn Bunting breeds across the middle latitudes of the south west Palearctic. Changing agricultural practices resulted in an 87 % decrease in the UK population between 1967 and 2006 and a 61% decrease across Europe between 1980 and 2005.

The Corn Bunting was a common breeding resident in coastal areas of Pembrokeshire up to the late 19th century. Writing in 1894 Murray Mathew considered them to be local inasmuch as he had never seen one more than five miles from the coast and his correspondants considered them to be plentiful at Pembroke and very abundant in the neighbourhood of Tenby. Their distribution coincided with the main barley growing area of that time. Bertram Lloyd (1939) found a similar coastal distribution in the 1920’s, his diary entries giving some idea of density by noting “all along the cliff hinterland from St Govan’s to Linney , I heard about 10 singing here on the 26th July 1927”. By the 1930’s Lloyd thought they might be decreasing, particularly in the north of the county, and by 1957 Ronald Lockley noted that they had become local and were rapidly decreasing. At this time he also noted that many farms had turned from tillage for cereal production to pasture for milk production. This conversion continued, resulting in the predominant dairy farming of today, with the resultant creation of habitat unsuitable for Corn Buntings.        

Breeding Corn Buntings probably disappeared after 1963 when there was still enough activity to produce winter flocks of up to 30 birds in the Gelliswick to South Hook area. Thereafter the species became so rare that individual occurrences were considered worthy of putting on record, viz: singles in 1967, 1968, 1975, 1978, 1981, 1982, 1987, 1991, 1993, two in 1965, 1977, 1979, 1992, three in 1980 and four in 1985. The last Corn Bunting to be recorded in Pembrokeshire was at Ramsey on the 26th August 1993.

It is interesting that a lone bird that frequented the Marloes peninsula from 1977 to 1981 regularly sang like a Yellowhammer. This seems to have been an individual development for single birds at Gilfach Cross in May 1987 and at Llanycefn in May 1992 sang normally.

Graham Rees. Pembrokeshire County Bird Recorder 1981-2007

LLOYD. B. 1929-1939 Diaries, National Museum of Wales.

LOCKLEY. R. M. (1957). Pembrokeshire, Robert Hale, London.

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Common and Arctic Terns – 2009

Passage migrant. Not recorded from December to February

It is not always possible to separate Common from Arctic Terns in the field unless they are close and seen well. However, most observers still wish to record what they see and log these birds as either “Common or Arctic”, usually expressed as “Commic Terns”. The following is a review of such records.

There has been a marked difference in the nature of spring and autumn passages. There are many breeding colonies of both species to the north and west of Pembrokeshire along the coastlines of both western Britain and eastern Ireland, which are probably the origin of most passing the county. Whereas there has usually been a strong passage of birds migrating southwards from these colonies in the post breeding season, comparatively few have been seen passing northwards on their way to the breeding grounds. Although there are juveniles as well as adults swelling the population in the autumn, this alone does not fully explain the discrepancy in the volume seen.

It seems more likely that having spent a pelagic winter season, most spring birds pass Pembrokeshire out of sight of land. This would explain why the majority that are detected are to seaward of the islands beyond the west coast, and why increasing numbers are seen from land further up the narrowing Irish Sea. It is interesting to note in this context that in the spring of 1984, when direct comparison was possible, twice as many were seen passing The Smalls compared to Skokholm. As with other species of migrant birds, spring passage is performed with a sense of urgency to reach the breeding grounds at an optimal time, so is a rapid event. By comparison autumn migrants do not need to travel to their wintering areas according to such a strict schedule, being able to pause and accumulate at rich feeding sources en route.

Many more Common than Arctic Terns are identified in the county, so probably make up the majority of reported “Commics”.

Autumn passage

Many more pass through on autumn passage, July to October, than in spring, with occasional accumulations of 100 to 800 birds having been noted off St Ann’s Head, Skokholm, Broad Haven (north) and sea area between Point St John, St David’s Head and the Bishops and Clerks as far out as Bais Bank. However, the majority have been recorded passing along the north coast at Strumble Head. Normally up to 30 per day were seen but periodically larger passages occurred, the largest on record being 190 on the 11th September 1984, 458 on 2nd September 1988, 459 on 27th August 1990, 256 on 11th September 1992, 363 on 4th September 1997, 375 on 1st September 1998, 199 on 17th August 2002, 726 on 31st August 2005 (an additional 151 Common Terns identified as well) and 501 on 8th September 2009.

These large movements have occurred with moderate to strong south or south-east winds, usually accompanied by poor visibility due to rain or drizzle. The terns have arrived on a north-west to south-east track, suggesting they had come from the Wicklow coastal area. The exception was on the 27/8/90 when they arrived from a north-easterly direction, presumably caused by a previous accumulation in Cardigan Bay moving on en masse, there being a moderate south-west wind and good visibility at the time.

Spring migration

Spring passage has been recorded from the 29th March to mid June, with stragglers to the end of June, the majority of birds being seen in late April and the first three weeks of May. Most were seen to the west of Skokholm, Skomer and Ramsey, with very few along the north coast but small numbers off the south coast. Most sightings were of one to five birds but up to 18 together have been seen. Those seen moving along the south coast could conceivably have continued their migration up the Bristol Channel and through the Severn valley.

Graham Rees. Pembrokeshire County Bird Recorder 1981-2007

More about Commic Terns in Pembrokeshire

Arctic Tern – 2009

Sterna paradisaea – MOR-WENNOL Y GOGLEDD – Passage migrant. Not recorded from December to March

The Arctic Tern has a continuous circumpolar Arctic and sub Arctic breeding range, the nearest nesting in Wales being at Anglesey and in Ireland in county Wexford. The species winters as far south as the edge of the Antarctic ice and there are ring recoveries of Anglesey birds off South Africa and Australia.

Mathew (1894) stated that the Arctic Tern was “seen commonly on passage in spring and autumn”, but Lockley et al (1949) later noted that they were “no longer seen commonly on passage” and noted just three occurrences, singles at Goodwick on the 13th August 1935 and at Skokholm on the 8th June 1938, with 20 at Dale at the end of April 1947. Donovan and Rees (1994) considered the Arctic Tern to be sparsely recorded in spring when up to eight at a time were seen passing, mainly off the west coast and offshore islands, between the 13th April and the 23rd June, but more numerous in autumn, when up to 30 in a day passed between the 21st July and the 22nd November, principally seen off the north coast.

Any detailed assessment of the Arctic Tern’s status is limited by the fact that only a proportion of Common or Arctic Terns are identified to species, most being logged as “Common or Arctic” , usually expressed as “Commic Tern” . What can be gleaned is that 130 were recorded at Skokholm on the 1st September 1997 and that single birds were recorded away from the coast at Heathfield Gravel Pit on the 23rd September 1999, at Bosherston on the 8-9th May 2000 and at Llawhaden on the 11th May 2000. 

See also the account for Common or Arctic Tern.

Graham Rees. Pembrokeshire County Bird Recorder 1981-2007

(Covers records up to and including 2009).

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