West Mojave Plan FEIR/S - Desert Managers Group

Table 3-21Characteristics of Older and Newer Die-Off RegionsIn the Fremont-Kramer DWMAREGIONAGE OF NO. MI 2 NO. RANGE AVERAGENO. & NAME DIE-OFFCARCASSESOLDER REGIONS NORTH OF HIGHWAY 58FK1. DTNAOlder 50 72 1 to 5 2.7Newer 13 30 1 to 5 1.8Subtotal63 1022.0FK2. Cuddeback Lake Older 36 53 1 to 4 2.2Newer 5 11 1 to 4 1.8Subtotal41 641.9FK3. California CityOlder 22 21 1 to 3 1.4Newer 5 5 1 to 2 1.3Subtotal27 261.4FK4. NE Kramer Jct. Older 15 24 1 to 4 1.4Newer 6 7 1 to 2 2.2Subtotal21 311.9TOTALSOlderNewer4 Areas123 (81%)29 (19%)152 mi 2 170 (76%)53 (24%)2231 to 3/1 to 51 to 2/1 to 51 to 2/1 to 51.82.11.9NEWER REGION BISECTED BY AND SOUTH OF HIGHWAY 58FK5. N of HWY 58 bisect Newer 32 37 1 to 4 1.7FK6. S of HWY 58 bisect Newer 19 26 1 to 5 1.4FK7. Edwards Bowl Newer 4 4 1 1.0TOTALSNewerOlder3 Areas45 mi 20 (0%)45 (100%)670 (0%)67 (100%)1/1 to 5N/A1 to 5Observations: Older regions north of Highway 58 comprised 123 mi 2 (81%) of the 152mi 2 die-off region, with 29 mi 2 (21%) of newer die-offs interspersed. Of the 223 carcasses found,170 (76%) were older and 53 (24%) were newer, with at least one and up to five carcasses foundon each square mile surveyed. There were also two newer regions in the Fremont-Kramer,which are bisected by Highway 58 (Region FK5 and Region FK6 on Map 3-13). Region FK7 is4 mi 2 and found near “Edwards Bowl.” Only 1 tortoise/mi 2 was observed, so this is more likelyan artifact of the survey as opposed to a regional die-off. The two bisected regions included 32mi 2 in Region FK5 and 19 mi 2 in Region FK6. There were 37 fresher carcasses north of thehighway and 26 to the south; given the similar region sizes, the average number of carcasses pertransect was similar (i.e, 1.7/mi 2 to the north and 1.4/mi 2 to the south). Like the older regions tothe north, there were between 1 and 5 carcasses found per transect. Unlike the older regions, 54of 67 carcasses (81%) found in these two areas were estimated to have died within four years ofbeing found.Given the above observations, areas north of Highway 58, excluding Region FK5, arepredominantly (81%) older die-off regions. Region FK5 and south of Highway 58 are (100%)newer die-off regions.1.4N/A1.5Chapter 3 3-115