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Results of the 2016 Bighorn Sheep Helicopter Survey in the Peninsular Ranges of Southern California

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Results of the 2016 Bighorn Sheep Helicopter Survey in the Peninsular Ranges of Southern California Results of the 2016 bighorn sheep helicopter survey in the Peninsular Ranges of southern California Compiled by Randy Botta and Janene Colby December 22, 2016 Bighorn sheep helicopter surveys were conducted in the Peninsular Ranges of San Diego, Riverside and Imperial Counties during November 7-15, 2016. Surveys were coordinated and funded by the California Department of Fish and Wildlife (CDFW). Logistical support was provided by the California Department of Parks and Recreation (CDPR) and the Bureau of Land Management (BLM). Participants included Randy Botta, Janene Colby, Christine Thompson, Amanda Eigner, Ken Devore (CDFW - Region 5), Kevin Brennan, Chanelle Davis, Jeff Villepique (CDFW - Region 6), Tim Glenner, Lora Konde (CDFW - WIL), and Dave Everson (Shasta Rotor and Wing). The bighorn sheep habitat surveyed ranged from the south side of Chino Canyon in the San Jacinto Mountains south to the Jacumba Mountains at the U.S. border with Mexico. Twenty-six of twenty-seven predetermined polygons were surveyed; Polygon 26 (Coyote Mountains) was not flown due to time constraints, and polygon 15 was combined with polygon 14 (Map 1). Weather during the surveys ranged from clear with temperatures in the Map 1 Peninsular Bighorn Sheep mid 80° F and calm winds to clear with CDFW Survey 2016 Sheep Group Locations temperatures in the low 90° F and Survey Polygons (1 – 27) Recovery Regions light winds. Locations of all observed SJM 1 SJM = San Jacinto Mountains bighorn sheep were recorded with a NSRM = N. Santa Rosa Mountains 9 CSRM = C. Santa Rosa Mountains SSRM = S. Santa Rosa Mountains Garmin Montana 650t GPS unit while CO C = Coyote Canyon NSYM =N. San Ysidro Mountains SSYM =S. San Ysidro Mountains flight paths were recorded using a VM = Vallecito Mountains 8 7 CC = Carrizo Canyon Area Samsung Galaxy Note 8.0 and the NSRM topographic software program Gaia CSRM 6 5 GPS. All sheep groups observed SSRM were photographed using a hand-held digital camera with stabilizing lens. 3 4 CO C 12 11 A total of 588 bighorn sheep (including 10 2 lambs) were observed in 125 groups NSYM 13 during a total of 47.88 rotor hours of actual survey time resulting in an SSYM 14-15 overall Catch per Unit Effort (CPUE) 17 of 12.28 sheep per rotor hour (Table 1 16 18 & 2). A total of 92 (87 female, 5 male) VM 20 marked (collared) bighorn sheep were 19 seen out of 149 (141 females, 8 25 males) present in the range, for an overall observation of 62 percent. 21 Population estimates were generated CC 26 24 using Chapman’s (1951) modification 22 of the Peterson estimator (Seber 23 1982). The overall range-wide 27 estimate for females (yearlings and adults) combined was 490 (Table 3) 1 and individual subpopulation estimates were: San Jacinto Mountains 32, north Santa Rosa Mountains 28, central Santa Rosa Mountains 65, south Santa Rosa Mountains 54, Coyote Canyon 45, north San Ysidro Mountains 29, south San Ysidro Mountains 29, Vallecito Mountains 101, and Carrizo Canyon 169. Additionally, an estimate for adult females only was generated (refer to Table 4). The overall range-wide estimate (yearlings and adult males and females combined but excluding lambs) was 794 (Table 5) and individual subpopulation estimates were: San Jacinto Mountains 56, north Santa Rosa Mountains 37, central Santa Rosa Mountains 119, south Santa Rosa Mountains 83, Coyote Canyon 69, north San Ysidro Mountains 59, south San Ysidro Mountains 42, Vallecito Mountains 163, and Carrizo Canyon 256. The overall lamb:ewe ratio (lambs per adult ewe) was 0.38 (Table 6) and individual subpopulations were: San Jacinto Mountains 0.52, north Santa Rosa Mountains 0.43, central Santa Rosa Mountains 0.52, south Santa Rosa Mountains 0.25, Coyote Canyon 0.46, north San Ysidro Mountains 0.39, south San Ysidro Mountains 0.32, Vallecito Mountains 0.28, and Carrizo Canyon 0.31. A secondary estimate was also generated using the simultaneous double-count method (Graham and Bell 1989), resulting in an overall estimate (lambs, yearlings, and adult males and females) of 752 in the survey area. Attached at the end of this report are the data sheets for each polygon flown during the survey (Tables 7-15): data sheets document the composition (ewes, lambs, yearlings, and rams) of each group observed along with the identification of each marked animal. Table 1 - Summary of Animals Observed Cl. I Yrlg Adult (yrlg.) Cl.II Cl. III Cl. IV Subpopulation Lambs Ewes Ewes Rams Rams Rams Rams Total San Jacinto Mtns. 11 2 21 5 5 8 2 54 N. Santa Rosa Mtns. 6 2 14 2 1 1 1 27 C. Santa Rosa Mtns. 24 9 46 6 9 11 21 126 S. Santa Rosa Mtns. 9 6 36 4 6 6 7 74 Coyote Canyon 13 9 28 6 7 6 2 71 N. San Ysidro Mtns. 7 1 18 3 4 7 6 46 S. San Ysidro Mtns. 6 3 19 2 3 2 3 38 Vallecito Mtns and 11 11 39 4 2 8 12 87 Fish Creek Mtns Carrizo Canyon and 9 10 29 4 5 3 5 65 Coyote Mtns Total 96 53 250 36 42 52 59 588 2 Table 2 - Flight Polygons Percent Marked Marked marked Regions and respective polygons Flight CPUE sheep sheep sheep (polygon numbers refer to those time (sheep present observed observed listed in USFWS recovery plan) (hrs) per hour) (F,M) (F,M) (F,M) SAN JACINTO MOUNTAINS 2.03 26.60 (10,2) (7,2) (70,100) 1. South side of Chino Canyon to 2.03 Murray Canyon NORTH SANTA ROSA MTNS 2.57 10.51 (11,0) (6,0) (55,NA) 9. Highway 74 west to Cathedral Cyn 2.57 CENTRAL SANTA ROSA MTNS 7.82 16.11 (19,1) (16,1) (84,100) 8. Highway 74 east to west side of 1.30 Bear Creek 7 - 6. Bear Creek South to Toro Cyn 3.85 6, 5, 4. Toro to North Barton Cyn 2.67 SOUTH SANTA ROSA MTNS 6.1 14.51 (17,1) (13,1) (76,100) 4. Big Wash to South Barton Cyn 2.35 2. Calcite Mine to Rattlesnake Cyn 1.75 3. Rattlesnake to Rockhouse Cyn 2.00 COYOTE CANYON 6.59 10.77 (11,1) (9,1) (82,100) 10. Coyote Mountain 1.22 11. Coyote Canyon (NE) 2.47 12. Coyote Canyon (SW) 2.90 NORTH SAN YSIDRO MTNS 2.90 15.86 (14,0) (9,0) (64,NA) 13. Henderson to Hellhole 2.90 SOUTH SAN YSIDRO MTNS 2.17 17.92 (12,0) (9,0) (75,NA) 14/15.* Tubb Canyon to Pinyon 2.17 Ridge (*includes most of polygon15) VALLECITO MOUNTAINS and 9.45 9.21 (31,2) (15,0) (48,0) FISH CREEK MOUNTAINS 16. NW Vallecito Mtns 1.72 (Pinyon Mtns) 17. Sunset Mtn 1.43 18. Harper Cyn to Alma Cyn 1.28 19. Alma Cyn to Split Mtn 1.67 20. Whale Peak 1.27 25. Fish Creek Mountains 2.08 CARRIZO CANYON AREA 8.25 7.88 (16,1) (3,0) (19,0) 21. Tierra Blanca Mtns to 1.43 Rockhouse Cyn 22. W. side of Carrizo Wash 1.47 (Rockhouse to Blackwater) 23. Carrizo Gorge 1.13 24. E. side of Carrizo Wash 1.42 26. Coyote Mountains 0.00 27. South of Interstate 8 2.80 Overall 47.88 12.28 (141,8) (87,5) (62,63) 3 Table 3. Female abundance estimates (Includes yearlings and adult females)a Region 2002 (95% CI) 2004 (95% CI) 2006 (95% CI) 2008 (95% CI) 2010 (95% CI) 2016 (95% CI) San Jacinto Mountains NAd NAd NAd NAd 9.7 (7.7-11.7) 32 (22.8 - 41.2) N. Santa Rosa Mtns. NAd NAd NAd NAd 51.4 (37.6-65.2) 28.1 (18.1 - 38.1) C. Santa Rosa Mtns. NAd NAd NAd NAd 70.5 (61.7-81.3) 64.9 (55.0 - 74.7) S. Santa Rosa Mtns. NAd NAd NAd NAd 84.4 (47.4-121.4) 54.3 (43.5 - 65.1) Coyote Canyon 23.0 (13.4-32.6) 24.7 (18.6-30.8) 20.7 (8.9-32.5) 31.0 (24.2-37.8) 46.1 (29.9-62.3) 44.6 (35.2 - 54.0) N. San Ysidro Mtns. 19.0 (19.0-19.0) 27.0 (13.1-40.9) 42.3 (24.5-60.1) 53.6 (40.1-67.1) 40.3 (25.6-55.0) 29.0 (21.8 - 36.2) S. San Ysidro Mtns. 29.0 (16.8-41.2) 33.0 (33.0-33.0) 22.0 (22.0-22.0) 47.6 (24.2-71.0) 35.7 (28.0-43.4) 28.9 (22.5 - 35.3) Vallecito and Fish Creek Mtns 56.3b 111.8 (36.9-186.6) 31.4 (25.2-37.6) 102.2 (42.9-161.5) 80.0 (55.1-104.9) 101.0 (72.6 - 129.4) Carrizo Canyon and c e Coyote Mtns 85.2 (44.9-125.4) 71.0 (15.0-127.0) 93.9 (68.9-118.9) 395.0 (0.0-797.8) 136.2 (78.9-193.5) 169.0 (45.4 - 292.6) Overall 225.5 (165.4-285.5) 229.7 (176.8-282.6) 208.1 (177.8-238.4) 394.9 (295.2.-494.6) 563.0 (491.1-634.9) 489.5 (436.6 - 542.5) Table 4. Female abundance estimates (adult females only)a Region 2016 (95% CI) San Jacinto Mountains 29.3 (21.0 - 37.5) N.
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