Brownsea Island It is within the South Dorset constituency of the House of Commons and the South West England constituency of the European Parliament. Brownsea Island has built up on a bare sand and mud bank deposited in the shallow harbour. Ecological succession has taken place on the island to create topsoil able to support ecosystems. The nature reserve on the island is leased from the National Trust by Dorset Wildlife Trust. This reserve includes a brackish lagoon and area of woodland. Other ecosystems on the island include salt marsh, reedbed, two freshwater lakes, alder carr, coniferous woodland, deciduous woodland and arboretum.
Brownsea Island Henry VIII recognised the island's strategic importance of guarding the narrow entrance to the expanding port of Poole. As part of a deterrent to invasion forces from Europe, the island was fortified in 1547 by means of a blockhouse, which became known as Brownsea Castle. In the following centuries, the island passed into the hands of a succession of various owners. In 1576, Queen Elizabeth I made a gift of Brownsea to one of her court favourites and rumoured lover, Sir Christopher Hatton. During the English Civil War, Poole sided with Parliament and garrisoned Brownsea Castle. Colonel Thomas Pride, the