|Location||St George's Channel|
|Area||106 ha (260 acres)|
|Length||1.6 km (0.99 mi)|
|Width||.8 km (0.5 mi)|
Skokholm (Welsh: Ynys Sgogwm) or Skokholm Island is an island 2.5 miles (4.0 km) off the coast of Pembrokeshire, Wales, south of the neighbouring island of Skomer. The surrounding waters are a marine reserve and all are part of the Pembrokeshire Coast National Park. Both islands are listed as Sites of Special Scientific Interest.
Skokholm is 1 mile (1.6 km) long and 0.5 miles (0.80 km) wide, covering 106 ha (260 acres). Made up of Old Red Sandstone, its cliffs stand between 70 feet (21 m) in the northeast, to 160 feet (49 m) in the southwest. Battered by storms, the high cliffs and isolated nature of the island make it a haven for seabirds. There is a rock outcrop close to the centre of the island, which provides shelter to the island's only structures. Its greatest height is 55 metres (180 feet).
Whilst no trees grow on the island in modern times, Skokholm is possibly Norse for "wooded island", a combination of skógr (wood, modern Norwegian: skog) and holmr (small island, middle English holm and modern Norwegian holme), named by the Vikings.
An undated charter is to be found in the British Museum by which William Marshal the Younger, Earl of Pembroke 1219–31, grants to a certain Gilbert de Vale, land in Ireland in exchange for lands in Pembrokeshire, including the island of 'Scogholm'. The revenue from the island from 1324 to 1472 was recorded in Ministerial Accounts. Some years later, the island was in the hands of Sir John Perrott, supposedly a natural son of Henry VIII. It appears (in Latin) on a 1578 map of Pembrokeshire as Skokeholme Insul.
The island was bought for £300 in 1646 by William Philipps, a barrister, and it was kept in the family for the next 360 years. In 2005 his descendant Mrs. Osra Lloyd-Philipps (1920 - 24 March 2005) of Dale Castle died. The trustees of the estate decided to offer the island for sale, with first refusal going to the Wildlife Trust of South and West Wales, who had managed the island for the last 50 years on their behalf. After a large fundraising effort, the island was successfully purchased in April 2006 for £650,000, and designated a national nature reserve in December 2008..
In 1933, Skokholm started functioning as a bird observatory, the first in Britain, founded by Ronald Lockley; its prime function was the ringing of wild birds of resident, visiting or migrating species and research. Lockley started the Pembrokeshire Bird Protection Society in 1938, now incorporated in the Wildlife Trust of South and West Wales. In 1948 the West Wales Field Society (WWFC), also now Wildlife Trust of South and West Wales, first took the Lease of Skokholm from the owners of the Dale Castle Estate. The WWFC followed on the Lease by Ronald Lockley which had run from 1927 but direct involvement commenced two years earlier when in 1946 the bird observatory was re-opened after the war. Ringing on Skokholm ceased from 1976. During the period of radar studies of migration around 1960 it became clear that bird movements as observed at the observatories were by no means representative of the whole and, inevitably, the significance of the observatories in the study of migration waned. Skokholm had been the site of the most thorough British studies of the storm petrel and razorbill amongst the seabirds and the oystercatcher and the wheatear amongst the landbirds. "There can be few other islands anywhere in the world that can boast the continuity of biological recordings, save for wartime years, that has taken place on Skokholm." John Fursdon, Warden 1946. Skokholm Island was re-accredited as a bird observatory in 2014, with resident wardens Richard Brown and Giselle Eagle.
The island is composed entirely of mudstones and sandstones of late Silurian/early Devonian age assigned to the 'Milford Haven Group' of the Lower Old Red Sandstone. This suite of rocks was formerly known as the 'Red Marls'. The strata are folded into a syncline with an east–west axis hence the rocks on the north coast dip inland i.e. to the south, at 25° to 40° whilst those on the south coast also dip inland i.e. to the north, even more steeply, at up to 80°. A couple of north–south aligned faults affect the strata at the eastern end of the island, erosion along them being responsible for both Crab Bay and North Haven.
Most of Skokholm is simple sub-maritime grassland, with the wetter areas graded as heath and some salt marsh. All of these areas house common natural species including three-lobed water crowfoot, tree mallow, marsh St. John's wort, small nettle, and sea campion.
Larger fungi were extensively studied in the 1940s and 1950s by Frederick Parker-Rhodes who published a series of papers based on his research on the island. Skokholm is the type locality for the corticioid species Trechispora clanculare (Park.-Rhodes) K.H. Larss., described as new to science from the island where it was first found in a puffin burrow. Due to its isolated nature, Skokholm houses British nationally scarce lichens including golden hair lichen (Teloschistes flavicans).
Bird life and larger fauna
Skokholm is home to the third largest Manx shearwater colony (15% of world population), and 20% of Europe's population of storm petrels, as well as (in 2008) 4,500 puffins and 2,000 guillemots and razorbills. A survey in 2016 found the population of puffins to be just under 7,000, and that of guillemots to be 4,000, the highest number since 1927. In 2021, the puffin population was in excess of 11,000, the highest since the 1940s. There are also large colonies of lesser black-backed gulls, herring gulls and great black-backed gulls. The island is a breeding site for oystercatchers, chough, skylark and wheatear.
In addition to the impressive numbers of breeding seabirds, it is a good UK site for passage migrants, including chiffchaff, willow warblers, whitethroat, redstart, and spotted and pied flycatchers.
After the Norman invasion of north Pembrokeshire led by Robert fitz Martin, the Normans built a rabbit farm on the island, later revived during the Victorian era. As a result, the island houses an example of long-term rabbit-maintained grass. House mice were accidentally introduced in the late 19th century.
The first Skokholm Lighthouse was built in 1776, and then rebuilt at its present site in 1861. The lighthouse forms a triangle of protection into Milford Haven along with the lighthouses at South Bishop and the Smalls. Automated in 1983, it is now monitored and controlled from the Trinity House Operations Control Centre at Harwich in Essex. The farm cottage restored by Lockley is a grade II listed building, and the surrounding farm buildings have been converted to accommodation units.
Connecting boats leave from Martin's Haven, with booked visitors able to stay on this island in basic accommodation. In 2010, the trust announced improvements to the island's landing jetty to allow easier access, with a £38,250 development project funded by Crown Estates and RWE Npower.
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- Ordnance Survey mapping
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- "Unknown". The Island Naturalist. Wildlife Trust West Wales (36): 4–11. Autumn 1998. ISSN 1367-6466. Cite uses generic title (help)
- Skokholm and Skomer Nature Reserves Report for 1976. WWNT
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- Lewis, Anna (31 March 2020). "What self isolation is like when you live on Wales' islands". Wales Online. Retrieved 12 September 2020.
- British Geological Survey 1:50,000 scale geological map sheet (England & Wales) 226/227 Milford (BGS, Keyworth, Notts)
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- Parker-Rhodes, F. (1954). "The Basidiomycetes of Skokholm Island. I. Annotated species list". Transactions of the British Mycological Society 37 (4): 324–342.
- Parker-Rhodes, F. (1955). "The Basidiomycetes of Skokholm Island". XIII. Echinotrema clanculare gen. et sp. nov." Transactions of the British Mycological Society 38 (4): 366–368.
- "Guillemot numbers on Skokholm island reach record level". BBC News. 8 June 2016. Retrieved 9 June 2016.
- "Puffin numbers boom to 1940s-level high on Skokholm". BBC News. 25 March 2021. Retrieved 25 March 2021.
- "Skokholm Lighthouse". Trinity House. Retrieved 21 March 2018.
- "Skokholm landing quay is improved". BBC Wales. March 24, 2010. Retrieved September 2, 2010.
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