On Monday Jo and I spent the morning working with the Milford Conservation Volunteers at Keyhaven. Although we mainly work at Blashford Lakes and Fishlake Meadows we have a number of other sites to look after. The reserve at Keyhaven is large, consisting of almost all the saltmarshes and mudflats outside the sea wall between Hurst Beach and the Lymington River. It is an important reserve for nesting gulls and terns in the summer and for waders and wildfowl in the winter. Its value is greatly enhanced by the neighbouring Hampshire County Council nature reserve, together the two reserves make one of the largest areas managed for nature conservation in the county.
The work we were doing was on the one small area of the Trust reserve that is inside the seawall. The wall here used to be a rather porous construction of timber and clay, as a result the land behind it was wet and quiet salty. Since the wall was reconstructed just over 25 years ago the saltwater has been kept out more effectively and the area has become drier and fresher. A lot of species are adapted to live in the narrow habitat band that lies between the saltiness of the sea and truly freshwater, as this habitat is very restricted these species tend to be very local and frequently rare. A time of rising sea level might be thought of as one which would bring benefits to these species, but in fact many are in decline. Our modern seawalls are effectively engineered so that they keep almost all of the saltwater outside and freshwater inside, the fuzzy edge that was the home of the brackish habitat lovers has been squeezed.
I was approached last year by a group of local residents interested in the potential of getting the brackish elements back, by finding a way to get some more seawater onto the marsh. It was really exciting to have such interest in what is often perceived as a dull habitat. Although we are still looking at how they goal might be achieved there is interest in the idea from both Natural England and the Environment Agency.
Monday’s task was to tackle some of the scrub that has established since the site has become fresher so that the former open character can be restored. We coppiced lots of willow and cleared a large area of bramble thicket. Hopefully once there is a more salty regime this will help to limit the regrowth of much of this scrub and encourage brackish marshland habitat.