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Location United Kingdom, South East
Central coordinates 0o 45.54' West  50o 45.89' North
IBA criteria B1i, C3
Area 627 ha
Altitude 0 - 1m
Year of IBA assessment 2007

Royal Society for the Protection of Birds

Site description A central area of mudflats and saltmarsh, and surrounding brackish marsh and pasture. The harbour itself has a narrow opening to the sea, flanked by shingle-beaches. The IBA supports large numbers of wintering wildfowl, and is also nationally important for wintering Phalacrocorax carbo.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Northern Pintail Anas acuta winter  2001-2006  615 individuals  good  B1i, C3  Least Concern 

IBA Monitoring

2007 low near favourable medium
Good - based on reliable and complete / representative data

Invasive & other problematic species, genes & diseases problematic native species/diseases - unspecified species happening now small area/few individuals (<10%) slow but significant deterioration low
Natural system modifications dams & water management/use - abstraction of ground water (agricultural use) likely in short term (within 4 years) small area/few individuals (<10%) moderate to rapid deterioration low
Pollution agricultural & forestry effluents - soil erosion, sedimentation happening now small area/few individuals (<10%) slow but significant deterioration low
Pollution domestic & urban waste water - sewage happening now small area/few individuals (<10%) slow but significant deterioration low

Anas acuta Northern Pintail 600 615 individuals 100 favourable
Branta bernicla Brent Goose 3010 2423 individuals 81 near favourable

Whole area of site (>90%) covered by appropriate conservation designation  A management plan exists but it is out of date or not comprehensive  Some limited conservation initiatives are in place  medium 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Pagham Harbour Site of Special Scientific Interest 629 is identical to site 627  
Pagham Harbour Wetlands of International Importance (Ramsar) 637 is identical to site 627  


IUCN habitat Habitat detail Extent (% of site)
Forest Broadleaved deciduous woodland  -
Shrubland Scrub  -
Grassland   -
Wetlands (inland) Coastal lagoons; Mud flats and sand flats; Salt marshes; Shingle or stony beaches; Tidal rivers and enclosed tidal waters; Water fringe vegetation  -

Land use

Land-use Extent (% of site)
nature conservation and research -
tourism/recreation -

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Pagham Harbour. Downloaded from on 28/10/2016

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