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provides critical insight into the ecological function of unfragmented forest blocks, which provide core
habitat as well as vital connectivity to larger forest blocks beyond town boundaries. Here are some of
the key concepts deployed by Biofinder:
Forest Block: a contiguous area of forest in any stage of succession, not currently developed for other
uses.
Habitat Block: Forested areas of at least 20 acres with no roads or low densities of Class IV roads. They
contain little or no human development such as buildings, parking areas, lawns, gravel pits, active
agricultural land, and so forth, but can be composed of any natural land cover type: various successional
stages of forest, wetland, old meadow, among others.
Connectivity Blocks: land or water that links wildlife habitat within a landscape, essentially acting as a
“stepping-stone” that allows for migration of animals and plants and the functioning of ecological
processes. Riparian areas along streams and rivers, strips of forest cover between developed areas, and
even hedgerows/ fencerows all represent potential connecting habitat for wildlife and other organisms.
Generally, such areas are characterized by undeveloped forested and riparian corridors, including forest
cover reaching to road rights-of-way, which serve to link large tracks of unfragmented core habitat.
Interior forest block: Also known as core habitat, these are areas of the most highly contiguous forest
and other natural habitats that are unfragmented by roads, development, or agriculture. The defining
factor is that there is little or no permanent habitat fragmentation from roads, agricultural lands and
other forms of development within an interior forest block.
Fragmentation: When roads, land clearing, development, or other land uses divide forests, waterways,
or other natural habitats into smaller and smaller areas. Depending on the location and scale,
fragmentation can negatively affect plant and animal species, wildlife habitat, and water quality.
Barnet’s priority interior forest blocks are largely concentrated in the eastern portion of town, following
the Passumpsic River. They support viable populations of wide-ranging animals that require large areas
to survive by allowing access to important feeding habitats, the ability to move and find mates for
reproduction, and as a result ensure genetic integrity of populations. The largest and highest ranked
priority habitat blocks are contained in the Roy Mountain WMA, and in the area where Barnet, Danville,
and Peacham boundaries meet.
Barnet’s priority interior forest blocks also function as highest priority connectivity blocks, allowing for
north movement along the Passumpsic valley up into vast concentrations of interior forest blocks in
Essex County, as well as movement south into the Groton State Forest.
Barnet also contains a vast network of riparian connectivity corridors along its lakes and streams. Many
wildlife species use riparian corridors for travel to find suitable habitat, but certain species are almost
entirely restricted to riparian areas, including mink, otter, beaver, and wood turtles. Maintaining
vegetation buffers along these corridors is critical.
After a century of forest regeneration, Vermont is now losing forest cover. While some of this loss
comes from conversion of forests to agriculture and commercial uses, the main cause is incremental,
low density residential development. Subdivision is contributing to parcelization as well. While large
areas of the state were once made up of large parcels owned by a single family or company, properties
are now often split and sold to many different buyers. Parcelization impacts forests, even when the land
is not converted for development. Overall, economically and environmentally sustainable forest
management is very difficult on parcels smaller than 50 acres. The Vermont Parcelization web site