What is a credit and debit and how are they determined?
Credits are
determined by the amount of functional acres within the project site above
general regional conditions (baseline). This can be achieved by committing to
maintain the current functional acres over time (referred to as “preservation
project”, though active management of the site is required) or by enhancing or
restoring the project site and committing to maintain the additional functional
acres achieved over time (referred to as “enhancement” or “restoration”
projects).
A functional
acre is represented by the assessed habitat functionality above baseline
multiplied by the total number of acres being considered for enrollment.
In general, functionality incorporates three separate scales:
Landscape
Scale – Desktop analysis
Management
importance factor (core, priority, general management areas)
Abundance vs.
limited availability of seasonal habitats (breeding, late brood rearing,
winter)
Proximity
factor (distance between the credit site and the debit site – Debit projects
only)
Local Scale –
Desktop analysis
Habitat
suitability index (provided by US Geological Survey analysis in Nevada)
Anthropogenic
impacts (with field review)
Site Scale –
Field data collection
Canopy cover –
Sagebrush and other shrubs, perennial grasses, perennial forbs, invasive annual
grasses
Height –
Sagebrush and other shrubs
The following figures demonstrate a simplified version of the concepts of functional acres,
functional acres above baseline, and credits generated: