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Habitats: Seabird Sanctuary Spared by Swift Action as Surge Tide Threatens Coastal Nesting Grounds​

19 August 2025
By James Hamilton
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Langstone Harbour serves as a vital breeding ground for seabirds along the south coast. Image credit: RSPB

In a timely intervention that may have saved hundreds of vulnerable seabird nests, conservationists and local authorities successfully restored a key breeding site in Langstone Harbour just weeks before a powerful tidal surge struck the Hampshire coast.

Earlier this year, Havant Borough Council, working alongside environmental groups, carried out vital restoration on the lagoon islands off Hayling Island. The project involved reshaping the land and laying down 400 tonnes of shingle, creating elevated nesting areas for seabirds increasingly at risk from rising sea levels and storm surges.

Their efforts were dramatically vindicated on May 27, when an unusually high tide - known as a surge tide - swept through the Solent. While such conditions could have devastated the nesting grounds, the newly-raised islands held firm. According to the council, most nests remained dry and intact, sparing what might otherwise have been a breeding season lost to the sea.

The impact was immediate and visible. Black-headed gulls, a species in long-term decline, returned in force. Researchers recorded 501 nesting pairs, up by more than 100 from the previous year. Other species, including Sandwich and Little Terns, also made use of the islands, with their fledged young seen there for the first time in recent memory.

"It's great to see the seabird numbers recover at the old oyster beds," said Wez Smith, senior project manager with the Royal Society for the Protection of Birds (RSPB). “This site is one of the most amazing on the English south coast and a real gem on the shores of Langstone Harbour.”

The project may also benefit marine life beyond seabirds. Dr Luke Helmer from the Blue Marine Foundation hopes the revitalised habitat will help support native oyster restoration in the Solent, a move that could further boost the local ecosystem. "If we get more oysters back, they can start to filter the water and provide essential habitat for a variety of fish species, some of which are a vital food source for the seabirds in the area," he said.

Once home to thriving oyster beds, Langstone Harbour remains one of the UK’s most important coastal habitats for seabirds. Thanks to careful planning and quick action, this fragile ecosystem, and the wildlife that depends on it, has been given a second chance.
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