|
Return to previous page |
|
10xx Urban 1001 High Intensity Urban 1002 Low Intensity Urban 1101 Disturbed, High 1102 Disturbed, Low 2000 Agricultural land
31xx - Grasslands
33xx – Xeric
Shrublands
41xx – Broadleaf Forest
42xx – Needleleaf Forest
|
4217 Subalpine Pine
43xx – Mixed
Needleleaf/Broadleaf Forest
44xx – Burnt, Standing Timber
5000 Water
61xx – Forested
Riparian
62xx – Non-forested Riparian
63xx Wetlands
70xx Barren Land
8100 Alpine Meadow 9100 Perennial Ice or Snow |
|
Return to previous page Modeling with Buffers For many species, the presence or proximity of water is as or more important than land cover type. To accommodate this in a GIS model, we constructed buffers of hydrologic features (streams, major rivers, lakes, and wetlands) and restricted the modeling of suitable habitat to those areas within the buffers. The following buffers were used in ID-GAP to model wildlife-habitat relationships. |
| amph1 | Rivers, streams, lakes and wetlands buffered to 250m. All interior of wetlands included, but only 30m into lakes included. |
| amph2 | Major rivers, lakes and wetlands buffered to 1km. All interior of rivers and wetlands included, but only 30m into lakes included. |
| amph3 | Rivers, streams, lakes, and wetlands. No outside buffer. All interior of rivers and wetlands included, but only 30m into lakes included. |
| amph4 | Rivers, streams, lakes, and wetlands buffered to 500m All interior of rivers and wetlands included, but only 30m into lakes included. |
| amph5 | This buffer not used. |
| amph6 | Rivers, streams, lakes, and wetlands buffered to 90m All interior of rivers and wetlands included, but only 30m into lakes included. |
| amph7 | Rivers, streams, and lakes buffered to 90m. No interior of rivers or lakes was included. |
| lake90 | Lakes and reservoirs buffered to 90m |
| lake1km | Lakes and reservoirs buffered to 1km |
| lake_wet90 | Lakes, reservoirs, and wetlands buffered to 90m |
| lake_wet500 | Lakes, reservoirs, and wetlands buffered to 500m |
| lake_wet1km | Lakes, reservoirs, and wetlands buffered to 1km |
| majriv90 | Major rivers buffered to 90m |
| majriv500 | Major rivers buffered to 500m |
| majriv1km | Major rivers buffered to 1km |
| river90 | Rivers and perennial streams buffered to 90m |
| river500 | Rivers and perennial streams buffered to 500m |
| river1km | Rivers and perennial streams buffered to 1km |
| wetland500 | Wetlands buffered to 500m |
| wetlnd90 | Wetlands buffered to 90m |
|
Return to previous page Elevation A 2-arc-second digital elevation model if Idaho (compiled from USGS DEMS) was used to restrict modeling of suitable habitat to within defined elevation limits. |
|
Return to previous page Climate Zones PRISM grid of mean freeze-free days was split into 10 categories and converted from 5km resolution to 30m. Categories were numbered from 1 to 10 with 1 being the least freeze-free days per year (coldest climate) and 10 being the most freeze-free days per year (warmest climate). Climate restrictions were used to better predict habitat for reptiles and amphibians. |
|
Return to previous page Species Status Species status designations were obtained from the Idaho Conservation Data Center's listings of species of conservation concern. The following links contain more information: |
|
Return to previous page Protection Status Categories GAP currently uses a scale of 1 to 4 to denote relative degree of maintenance of biodiversity for each tract. A status of “1” denotes the highest, most permanent level of maintenance, and “4” represents the lowest level of biodiversity management, or unknown status. This is a highly subjective area, and we recognize a variety of limitations in our approach, although we maintain certain principles in assigning the status level. Our first principle is that land ownership is not the primary determinant in assigning status. The second principle is that while data are imperfect, and all land is subject to changes in ownership and management, we can use the intent of a land steward as evidenced by legal and institutional factors to assign status. In other words, if a land steward institutes a program backed by legal and institutional arrangements that are intended for permanent biodiversity maintenance, we use that as the guide for assigning status. The characteristics used to determine management status are as follows:
• Permanence of protection from conversion of natural land cover to unnatural (human-induced barren, exotic-dominated, arrested succession). The four status categories are generally defined as follows (after Scott et al. 1993, Edwards et al. 1995, Crist et al. 1995): Status 1: An area having permanent protection from conversion of natural land cover and a mandated management plan in operation to maintain a natural state within which disturbance events (of natural type, frequency, and intensity) are allowed to proceed without interference, or are mimicked through management. (e.g. Research natural areas) Status 2: An area having permanent protection from conversion of natural land cover and a mandated management plan in operation to maintain a primarily natural state, but which may receive use or management practices that degrade the quality of existing natural communities. (e.g. Wilderness areas) Status 3: An area having permanent protection from conversion of natural land cover for the majority of the area, but subject to extractive uses of either a broad, low-intensity type or localized, high-intensity type. It also confers protection to federally listed endangered and threatened species throughout the area. (e.g. National forests) Status 4: Lack of irrevocable easement or mandate to prevent conversion of natural habitat types to anthropogenic habitat types. Allows for intensive use throughout the tract. Also includes those tracts for which the existence of such restrictions or sufficient information to establish a higher status is unknown. (e.g. private) |
|
Return to previous page Major Land Ownership Categories To facilitate analyses of predicted wildlife distributions, land ownership is normally collapsed into 8 major ownership categories. These categories were determined based on the total land in each category as well as the relative contribution of that category to the total status 1 and 2 lands in the state. The 8 major ownership categories are:
|
|
|
IDVMD is a product of the |
|
|
The information presented on this page was collected/created as part of the Idaho Gap Analysis project. While we have made every attempt to ensure its quality, we make no claims as to its accuracy and are not responsible for its use. If you have additional questions regarding this information, please fill out and submit a Comment Form. This page is best viewed with Microsoft Internet Explorer. |
||
