The greatest threat faced by wildlife in the Acadian Forest is the shredding of its habitat into smaller pieces by high impact forestry, road-building, and land-clearing.  This fragmentation of wildlife habitat creates two problems: 1) species that need large areas of old forest lack suitable habitat if only small areas remain; and 2) species that shy away from crossing relatively open areas are restricted in movement if small areas of forest are surrounded by clearcuts, young forests, or farm fields.  By managing for a greater diversity of trees, in terms of species, sizes and ages, low impact forestry helps minimize habitat fragmentation.   Examples of Wildlife Threatened by Fragmented Habitat   Marten: These large weasels disappear from areas where clearcuts, young forests or fields occupy more than 25 percent of the forest area.   Amphibians: Research in the Fundy Model Forest discovered that red-spotted newts will not travel through clearcuts or young tree plantations, which can prevent them from moving between their normal uplands habitat and their wetlands breeding habitat.   Flying Squirrels: Flying squirrels travel by gliding from tree to tree. Since they can only glide about 20 metres they require forests that still contain plenty of large trees.   Yellow Lady Slipper: Populations of forest plants such as the Yellow Lady Slipper can become isolated from one another by if the landscape is turned into a patchwork quilt of small forested areas and clearcuts. Isolation leads to inbreeding, reducing genetic diversity, placing the plants at risk of becoming locally extinct.