AQA GCSE Geography: Management of Coastal Habitat Case Study
Terms in this set (6)
MANAGEMENT COASTAL HABITAT: Case Study
MANAGEMENT COASTAL HABITAT: Characteristics
Essex Marshes one of top 5 coastal wetlands in Britain (value to wildlife).
MANAGEMENT COASTAL HABITAT: Essex Marshes as a habitat
Provides valuable habitats for marine life (SHORE CRABS+HERRINGS), birds feeding (REDSHANK) and salt-loving plant communities.
MANAGEMENT COASTAL HABITAT: Threat to marshes
Farmers gradually reclaimed land from sea during last 400 YEARS. SEA WALLS built to ALLOW GRAZING, then ARABLE FARMING. 2500 hectares of coastal marsh remain- 30,000 hectares in 1600. Protection needed more urgently as threats increase- human from urban development spreading north.
MANAGEMENT COASTAL HABITAT: Strategies for Conservation
Areas can be SSIs so they are preserved- carefully managed to maintain biodiversity. Main strategy deliberately allowing rising sea levels to flood large areas- making GAPS in EXISTING DEFENCES. TRIAL SCHEME 2006 destroyed 300M SEA WALL+ allowed TIDE WASH IN.
MANAGEMENT COASTAL HABITAT: How is salt marsh formed?
1.Starts as accumulation of mud and silt in sheltered part of coast- mudflats initially only uncovered 1 hour in every 12 hour tidal cycle.
2.Ovet time, more mud and silt deposited to create series INTER-TIDAL MUDFLATS.
3. Since saline conditions, only SALT TOLERANT SPECIES colonise first (CORDGRASS- long roots).
4.Plants trap mud around them, craeting surface that remains exposed for longer between tides.
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