Authorities tend to fence off what they consider the entire potential breeding area.
Its conservation value is further marked by its role as the boundary between mangrove and Melaleuca forests, and as a reproduction and breeding area of marine species.
Their west Atlantic population ranges the East Coast of the U.S. and Canada and far out to sea, but the Gulf of Mexico is the giant fish's only known breeding area.
The Chiterns Conservation Board said the area now had the highest breeding density of red kites in England and added there could be more than 600 breeding pairs in the area.
Dan Jarvis, from the Cornish Seal Sanctuary at Gweek in west Cornwall, said he is concerned the activity could discourage grey seals from using the area for breeding.
Environmentalists said the area is a breeding ground for bird species including rare skylarks and lapwings.
Any feathers the bird had grown at a particular breeding ground would reflect the area's "signature" in their isotope ratios (the relationship between different types of the same atom), narrowing the search area for researchers.
Their pioneering study of blue whales in this area reveals its significance as breeding and feeding grounds for the largest creature on earth.
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Experts identified the area as an environmentally fragile cheetah breeding ground, and a 1996 management plan aimed to protect the vulnerable species by banning jeep-led safaris, which could interrupt hunts or scare and separate families.
At Breezy Point, the difference this year is that so much of the fenced area appears to be high-quality breeding habitat, Mr. Avrin explained.
Wez Smith, RSPB Langstone Harbour site manager, said the beach would now offer an "attractive and safe" nesting area for the area's little tern population during the breeding season.
The council is to consider introducing laws restricting activities such as entry to the reserve at certain times, including breeding seasons, using radios which might disturb wildlife and deliberate damage or disturbance to the area.
The agency says the area, near the Slimbridge Wetland Centre, is of "international importance" for migrating wildfowl, breeding waders, migratory fish and Atlantic eels.
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