Dynamic Dunescapes is a partnership project restoring sand dunes across England and Wales for the benefit of wildlife, people and communities
What are sand dunes?
A sand dune is a hill or ridge beyond the reach of the tides. Dunes begin life as a singular grain of sand or shell fragment, blown inland by the offshore winds which accumulate on vegetation above the strandline. Overtime, our distinct mountains of sand have formed, standing at the forefront of our coastal weather systems and naturally shifting.
Why do sand dunes matter?
The coastal dunes of England and Wales are internationally important habitats for wildlife.
72 important sand dune species in England and Wales live here amongst two priority habitats.
Dunes are highly diverse environments, home to a variety of orchids and many insects and ground nesting birds. The damper dune slacks are the perfect habitat for amphibians such as the rare and protected natterjack toad – Cumbria is home to over a quarter of the UK’s natterjack toad population!
Dunes are also full of history, they provide a place for recreation and tourism, ecosystem services as well as beautiful views and are a place to be enjoyed as well as protected.
Healthy, dynamic dune systems support a variety of habitats and species
Embryo/frontal dunes - Sand is trapped by obstacles moved by wind and waves. Above the high tide line embryo dunes develop and pioneer plants establish including sand couch and lyme grass. Marram grass grows as fast as the sand builds and starts to dominate, accumulating sand to form higher mobile dunes. Specialised plants may include sea holly. Sand lizards and northern dune tiger beetles rely on bare sand here too.
Fixed dunes/ dune grassland - as marram dominates, bare sand cover is reduced. Mosses and grasses start to grow. Soil begins to form and many plants and wildflowers coexist, including the pretty dune gentian and bee orchid. Species diversity here is rich; ground-nesting birds such as skylarks thrive here, while rabbits burrow and solitary bees roam.
Dune slack - These are the hidden gems of any dune system. Low-lying, wind-blown wet depressions within the dunes are vital breeding pools for natterjack toads and a habitat for great crested newts and a variety of invertebrates. The surroundings can support a range of orchids such as coral root and marsh helleborine and other flora including round-leaved wintergreen. Sedges and creeping willow thrive.
Dune heath - This is priority habitat, as it is becoming increasingly scarce in the UK. Soil is dry and acidic. Heather is abundant and provides for ground nesting birds and insects. Dune heath can be calciferous too.
Scrub and Woodland - In the late successional stages of dune systems, you can find dominance of tall, woody perennials and understorey species. Very little, if any, bare sand is present here. The habitat provides important shelter for birds and mammals.
Natural disturbances - Storms create blow outs (new areas of exposed sand at the front or within a dune system), rabbits burrow into the dunes and visitors can trample, creating areas of bare sand. This kick-starts the earlier successional stages, forming patches of different habitat throughout the dune system, supporting a range of biodiversity.
However, the dynamic processes of the dunes have been impeded, threatening and stabilising our dunes.
Why do sand dunes need restoring?
Sand dunes are the most at risk habitat in Europe for biodiversity loss.
There are only 20,000 hectares of dunes left in England and Wales.
Dunes have become overgrown with vegetation and have stabilised. This is due to a variety of factors that have slowly impoverished the dunes over many decades. Factors include: conventional dune-stabilising management, change in land use and grazing regimes, nitrogen deposition and climate change, an increase in invasive species and widespread vegetation growth, and even significant local loss of grazing rabbit populations from disease.
These issues have impeded the natural dynamic nature of sand dunes; healthy dunes need areas of shifting sand in which bare sand-loving plants and animals can survive, but the older, less-mobile ecological succession stages of sand dunes have taken over. Increased vegetation has reduced the variety of dune habitats present which specialised species rely on to thrive, threatening the special biodiversity that lives there.
Changes in Cumbrian sand dunes over the decades
These historical aerial images are of South Walney Nature Reserve. The white on the 1960’s photo show areas of bare sand as part of a healthy dune system. See how the dunes have changed over time.
In this instance, large gull colonies nesting on site overtime caused a layer of nutrient rich soil to build on top of the sands, contributing to the vegetation growth seen in the more recent image. Subsequently there has been natural decline of these populations.
What will be happening in Cumbria?
Cumbria Wildlife Trust are working with area lead Natural England across 11 sites in Cumbria including Fleetwood in Lancashire. The project will work with skilled local and national experts, involve schools and local groups, volunteers and visitors of all ages and backgrounds to help rejuvenate our dunes.
Works to help restore biodiversity on the dunes will include scrub clearance, removal of invasive species, turf stripping, pond creation and restoration for natterjacks and restoration of rabbit populations. Grazing cattle will be introduced and managed to maintain dune grassland by disturbing the ground and keeping unwanted scrub at bay. All work will be carried out in carefully selected areas, part of an on-going process and monitored longer term via a national monitoring scheme and species surveying.
How to get involved
Register your interest to become a volunteer.
Keep an eye out for upcoming events.
Join us on Twitter @DynamicDunes
Dynamic Dunescapes is a partnership project rejuvenating sand dunes in England and Wales, funded by the National Lottery Heritage Fund and the EU LIFE Programme. Project partners are Natural England, Plantlife, National Trust, Natural Resources Wales, Cornwall Wildlife Trust, Lincolnshire Wildlife Trust and Cumbria Wildlife Trust.