Brighton and Lewes Downs Biosphere Reserve is found within the temperate
broadleaf forests
biome of the
Palearctic realm's British Island province and includes the following
habitats: coastal chalk cliffs, sub-tidal chalk reef, freshwater
wetland, shingle beaches,
deciduous woodland, river
estuaries and chalk
grassland. Three distinct but interrelated environments make up the biosphere reserve area; rural, coastal and marine, and urban. The rural environment contains lowland
chalk grassland which is one of the richest wildlife habitats in the country and particularly important for its high botanical species diversity with up to 40-50 vascular plant species per square meter. It also supports the invertebrate communities, notably butterflies with 20 species having a substantial proportion of their breeding populations within this habitat. Characteristic species include:
Phyteuma orbiculare,
Wart-biter (Decticus verrucivorus), and
Adonis blue butterfly (Lysandra bellargus). The coastal and marine environments are made up of a moderately exposed coast and inshore area of the
English Channel with cliffs providing nesting niches for birds such as
Northern fulmar (Fulmarus glacialis). The discontinuous chalk ledge to the west of Brighton gives rise to a unique series of low underwater north-facing chalk cliffs with biological records of over 300 marine species in the area. The area is home to 211 species that have been recorded on international conservation lists, such as the
European eel (
Anguilla Anguilla)) in addition to 1,052 local rare species including the
hedgehog (
Erinaceus europaeus) and
yellowhammer (
Emberiza citronella). Important local genetic varieties of species include the unique
elm tree {
Elmus spp.) as well as wild apple tree varieties. The domesticated breeds of
Southdown sheep and rare
Sussex cattle are also distinctive to the area. == Socio-economic characteristics ==