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Wildlife Specialist report

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Reticulate Gila Monster (Forest Service Sensitive Species Representative of Desert<br />

Shrub/Grassland Vegetation Cover Types) - In New Mexico, this species occurs in<br />

desert scrub and, more rarely, woodland and grassland habitats most commonly<br />

associated with rocky regions of mountain foothills and canyons. It is found from sea<br />

level to about 5000 ft in elevation (Stebbins 1985). Dominant vegetation often includes<br />

creosote bush, mesquite, acacia, ocotillo, and snakeweed. The seasonal activity period<br />

extends from March to November, although Gila monsters can be encountered basking at<br />

shelter entrances during the winter and early spring. Above ground travels range from a<br />

few meters around shelter entrances, to forays over 1.5 km, and these lizards can also<br />

climb (Degenhardt 1996, BISON-M 2009).<br />

This species has been selected as focal species for reptiles that occur in desert shrub, and<br />

grassland vegetation areas. For the analysis of this species the analysis indicators (road<br />

miles and acres of potential disturbance) will analyze the change in desert shrub and<br />

grassland habitat by alternative from the existing condition.<br />

Amphibian and Reptile Summary:<br />

Table 37 list road associated and motorized trail/ORV factors related to amphibian and<br />

reptile focal species that represent this group (Gaines et al. 2003); analysis factors based<br />

on the analysis factor discussed above; and the indicator that will be used to compare the<br />

different levels of affect between the different alternatives.<br />

Table 37:<br />

Focal Group/<br />

Species<br />

Amphibians &<br />

Reptiles<br />

Road Associated<br />

Factors<br />

Collisions, Collection Collisions³<br />

Collection<br />

Disturbance,<br />

Displacement,<br />

Avoidance, Harassment<br />

Motorized<br />

Trail/ORV<br />

Associated Factors¹<br />

Disturbance,<br />

Displacement, Avoidance,<br />

Harassment<br />

Combined<br />

Analysis Factors<br />

Analysis<br />

Indicator<br />

Harvest/Direct Effects Route Miles<br />

Disturbance/Indirect<br />

Effects<br />

Disturbance Zone<br />

Summarized In<br />

Acres<br />

Table 38 summarizes the harvest indicator, disturbance indicator, and analysis area that<br />

will be used to analyze the effects of the different alternatives to amphibians and reptiles.<br />

Table 38:<br />

Focal Species Motorized<br />

Chiricahua<br />

leopard frog<br />

Mexican<br />

Gartersnake<br />

Arizona Toad<br />

Narrow Headed<br />

Gartersnake<br />

Retculate Gila<br />

Monster<br />

Activity<br />

Motorized Trail/ORV<br />

Use<br />

Motorized Trail/ORV<br />

and Roads<br />

Motorized Trail/ORV<br />

and Roads<br />

Motorized Trail/ORV<br />

and Roads<br />

Harvest<br />

Indicator<br />

Route Miles<br />

Number of<br />

Stream<br />

Crossings<br />

Route Miles<br />

Route Miles<br />

Route Miles<br />

Disturbance<br />

Analysis<br />

Zone<br />

Area<br />

Miles of routes within:<br />

Occupied Sites<br />

- 1 mile overland<br />

- 3 miles along an ephemeral or<br />

intermittent drainage<br />

- 5 miles along a perennial stream<br />

250m Low Elevation<br />

Riparian<br />

”<br />

”<br />

Low, Middle, & High<br />

Elevation Riparian<br />

Desert<br />

Shrub/Grassland<br />

60

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