Holkham National Nature Reserve

Holkham National Nature Reserve is England's largest national nature reserve (NNR). It is on the Norfolk coast between Burnham Overy Staithe and Blakeney, and is managed by Natural England with the cooperation of the Holkham Estate. Its comprise a wide range of habitats, including grazing marsh, woodland, salt marsh, sand dunes and foreshore. The reserve is part of the North Norfolk Coast Site of Special Scientific Interest, and the larger area is additionally protected through Natura 2000, Special Protection Area (SPA) and Ramsar listings, and is part of both an Area of Outstanding Natural Beauty (AONB) and a World Biosphere Reserve. Holkham NNR is important for its wintering wildfowl, especially pink-footed geese, Eurasian wigeon and brant geese, but it also has breeding waders, and attracts many migrating birds in autumn. A number of scarce invertebrates and plants can be found in the dunes, and the reserve is one of the only two sites in the UK to have an antlion colony.

This stretch of coast originally consisted of salt marshes protected from the sea by ridges of shingle and sand, and Holkham's Iron Age fort stood at the end of a sandy spit surrounded by the tidal wetland. The Vikings navigated the creeks to establish Holkham village, but access to the former harbour was stopped by drainage and reclamation of the marshes between the coast and the shingle ridge which started in the 17th century, and was completed in 1859. The Holkham estate has been owned by the Coke family, later Earls of Leicester since 1609, and their seat at Holkham Hall is opposite the reserve's Lady Anne's Drive entrance. The 3rd Earl planted pines on the dunes to protect the pastures reclaimed by his predecessors from wind-blown sand. The national nature reserve was created in 1967 from of the Holkham Estate and of foreshore belonging to the Crown.

The reserve has over 100,000 visitors a year, including birdwatchers and horse riders, and is therefore significant for the local economy. The NNR has taken steps to control entry to the fragile dunes and other areas important for their animals or plants because of the damage to sensitive habitats that could be caused by unrestricted access. The dunes are an essential natural defence against the projected rises in sea level along this vulnerable coast.

Description

The reserve lies to the north of A149 coast road, starting just west of Burnham Overy Staithe and extending west past Holkham to Beach Road, Wells-next-the-Sea. It also includes the tidal salt marshes continuing further east to Blakeney.Natural England (2009) pp. 17–19. Its total area of about makes it the largest NNR in England. The reserve can be accessed by footpaths from Wells and the local villages Retrieved 3 September 2012. including the Peddars Way/Norfolk Coast long-distance trail that traverses the main part of the reserve, and National Cycle Route 1 loops through the core of the NNR between Holkham and Wells. Retrieved 3 September 2012. There is a car park near Holkham village at the north end of Lady Anne's Drive that gives access to two bird hides, and another parking area at the end of Beach Road in Wells. To the east of the Wells channel, the reserve is mainly salt marshes and mud flats, and is difficult and potentially dangerous to access, although a public footpath runs along the southern edge of these tidal areas. Retrieved 3 September 2012.

The salt marshes on this coast are stated in the Site of Special Scientific Interest (SSSI) notification document to be "among the best in Europe ... the flora is exceptionally diverse". Holkham also has good examples of sand dunes, and the pines planted on the dunes have provided shelter for other trees and shrubs to become established, making this the only substantial area of woodland in the North Norfolk Coast SSSI. The dunes are created and altered by the elements, and the sand islands in Holkham Bay have formed only within the last 60 years. The flat ground inland from the dunes is reclaimed salt marsh that was used as pasture until the 1940s, but converted to arable land during World War II. The value of the fields to wildlife was reduced by the resulting lower water table, but Natural England's management measures have raised the water levels, attracting breeding and wintering birds. Water management can also be used to ensure a high water table in summer, benefiting breeding waders, and drier conditions in winter, preferred by the geese. The management of water levels and grassland increased the numbers of breeding wetland birds from 120 pairs of ten species in 1986 to 795 pairs of 26 species in 1994, and the number of wintering birds of four key wildfowl species rose from 1,215 to 17,305 in the decade from 1983/84.

History

Norfolk has a long history of human occupation. Both modern and Neanderthal people were present in the area between 100,000 and 10,000 years ago, before the last glaciation, and humans returned as the ice retreated northwards. The archaeological record is poor until about 20,000 years ago, partly because of the then prevailing very cold conditions, but also because the coastline was much further north than at present. As the ice retreated during the Mesolithic (10,000–5,000 BCE), the sea level rose, filling what is now the North Sea. This brought the Norfolk coastline much closer to its present line, so that many ancient sites are now under the sea in an area now known as Doggerland. Retrieved 18 September 2012.Robertson ''et al.'' (2005) pp. 9–22.

The coast at Holkham originally consisted of salt marshes protected from the sea by ridges of shingle and sand. Retrieved 2 September 2012.
A large Iron Age fort (Holkham Camp) at the end of a sandy spit in the marshes could only be approached along the spit; it enclosed and remained in use until the defeat of the Iceni in 47 AD. The Vikings navigated the tidal creeks to establish Holkham, the name deriving from the Danish for "ship town".

The Holkham Estate has been owned by the Coke family since 1609, and Holkham Hall, built by Thomas Coke, 1st Earl of Leicester between 1734 and 1764, is opposite the NNR entrance. Retrieved 2 September 2012. Until the 17th century, ships could navigate the tidal creeks to reach the staithe (harbour) at Holkham village, but local landowners began to reclaim the marshes from 1639, and the final embankment at Wells was constructed by the 2nd Earl in 1859, completing the conversion of about to farmland. The 3rd Earl planted Corsican, maritime and Scots pines on the dunes in the late 19th century to shelter the agricultural land from wind-blown sand, which is carried inland when the wind speed exceeds three metres (10 ft) per second and blows from directions between northwest to northeast.

The Holkham National Nature Reserve was created in 1967 from of the Holkham Estate and of intertidal sand and mud flats belonging to the Crown Estate.Allen & Pye (1992) p. 148. In 1986 the NNR was subsumed into the newly created North Norfolk Coast SSSI. The larger area is now additionally protected through Natura 2000, Special Protection Area (SPA) and Ramsar listings, and is part of the Norfolk Coast Area of Outstanding Natural Beauty. Retrieved 8 November 2011. The coast from Holkham NNR to Salthouse, together with Scolt Head Island, is a Biosphere Reserve.Liley (2008) pp. 4–6.

Flora and fauna

Birds

As many as 50,000 pink-footed geese, 13,000 Eurasian wigeon and 7,000 brent geese winter at Holkham, making it of international importance for these species. Up to 400 white-fronted geese and a few tundra bean geese may join the wildfowl flocks, and the odd peregrine falcon, short-eared owl, merlin, marsh harrier or hen harrier may hunt over the fields. The shingle banks and foreshore hold wintering flocks of shore larks, snow buntings and twite, and waders like knots, curlews, dunlins and grey plover probe for invertebrates in the mud flats.

Spring migration is relatively quiet, although sightings of ring ouzel and firecrest are possible amongst the more common arrivals. Breeding birds include lapwings, common snipe, pied avocets, common redshanks and marsh harriers on the grazing marshes, ringed plovers and little terns on the beach, and black-headed, herring and lesser black-backed gulls on the salt marsh. The small grey heron colony has been joined by little egrets, and, from 2010, by Eurasian spoonbills. Retrieved 13 April 2017. In 2020, a pair of cattle egret successfully bred at the site, the first time the species had successfully bred in Norfolk. The pines may occasionally have nesting siskins or common crossbills, and parrot crossbills bred in 1984 and 1985.

Holkham's north-facing coastal location can attract large numbers of migrating birds in autumn if the weather conditions are right, especially with a north to north-east wind. The common species may be accompanied by a wryneck, red-backed shrike or greenish warbler in August, with goldcrests, thrushes and finches later in the season, and perhaps red-breasted flycatchers and yellow-browed warblers. Vagrant rarities such as Pallas's, Radde's or dusky warblers may occur;Newton (2010) p. 50. a red-breasted nuthatch in 1989 was the first, and, as of 2019, the only individual of its species to be recorded in the UK.

Other animals and plants

Brown hares and European otters are found all along the north Norfolk coast, but red squirrels disappeared from the Holkham pines by 1981. The rare natterjack toad breeds at Holkham,Natural England (2009) pp. 7–15. one of only two sites along this coast, although the common frog, common toad and common lizard are widespread in appropriate habitats.Norfolk Wildlife Trust (2005) pp. 12–15.

The green hairstreak, purple hairstreak, comma, hummingbird hawk-moth, broad-bordered bee hawk-moth and ghost moth are sometimes seen in the woods with the common butterfly and moth species, and a clouded yellow or Camberwell beauty may also occur in some years. Grayling, small heath and common blue butterflies can be found in the dunes, where there is also a large antlion colony, making Holkham one of only two locations for this predatory insect in the UK. Retrieved 7 September 2012. Dragonflies include the migrant hawker, southern hawker and ruddy darter or eelgrass