. . "Images of a beaver dam over a four month period. Beaver dams block rivers and create ponds."@en . . . . . . . . . "December 2009"@en . . . . . . . . . . . . . . . . . . . . . . . . . "Beaver dam enlargement"@en . . . "The beaver is a keystone species, increasing biodiversity in its territory through creation of ponds and wetlands. As wetlands are formed and riparian habitats enlarged, aquatic plants colonize newly available watery habitat. Insect, invertebrate, fish, mammal, and bird diversities are also expanded. Effects of beaver recolonization on native and non-native species in streams where they have been historically absent, particularly dryland streams, is not well-researched."@en . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . "September 2009"@en . . "165"^^ . . . . . . . . . . . . . "horizontal"@en . "right"@en . . . . . . . . . . . . . . . . . . . . . . . . . . "77000"^^ . . . . . . . . . . . "The beaver is a keystone species, increasing biodiversity in its territory through creation of ponds and wetlands. As wetlands are formed and riparian habitats enlarged, aquatic plants colonize newly available watery habitat. Insect, invertebrate, fish, mammal, and bird diversities are also expanded. Effects of beaver recolonization on native and non-native species in streams where they have been historically absent, particularly dryland streams, is not well-researched."@en . . . . . . . . . . . "Beaver dam - four months on - geograph.org.uk - 1623430.jpg"@en . . . . . . . . . . . . . . . . . . . . "1121022115"^^ . . . . . . . . . "66158871"^^ . . . . . . . . . . "Environmental impacts of beavers"@en . . . . . . . . . . . . . . . . "Beaver dam - geograph.org.uk - 1452003.jpg"@en . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .