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PLOS ONE  2014 

Disease and Predation: Sorting out Causes of a Bighorn Sheep (Ovis canadensis) Decline

DOI: 10.1371/journal.pone.0088271

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Abstract:

Estimating survival and documenting causes and timing of mortality events in neonate bighorn sheep (Ovis canadensis) improves understanding of population ecology and factors influencing recruitment. During 2010–2012, we captured and radiocollared 74 neonates in the Black Hills, South Dakota, of which 95% (70) died before 52 weeks of age. Pneumonia (36%) was the leading cause of mortality followed by predation (30%). We used known fate analysis in Program MARK to estimate weekly survival rates and investigate the influence of intrinsic variables on 52-week survival. Model {S1 wk, 2–8 wks, >8 wks} had the lowest AICc (Akaike’s Information Criterion corrected for small sample size) value, indicating that age (3-stage age-interval: 1 week, 2–8 weeks, and >8 weeks) best explained survival. Weekly survival estimates for 1 week, 2–8 weeks, and >8 weeks were 0.81 (95% CI = 0.70–0.88), 0.86 (95% CI = 0.81–0.90), and 0.94 (95% CI = 0.91–0.96), respectively. Overall probability of surviving 52 weeks was 0.02 (95% CI = 0.01–0.07). Of 70 documented mortalities, 21% occurred during the first week, 55% during weeks 2–8, and 23% occurred >8 weeks of age. We found pneumonia and predation were temporally heterogeneous with lambs most susceptible to predation during the first 2–3 weeks of life, while the greatest risk from pneumonia occurred from weeks 4–8. Our results indicated pneumonia was the major factor limiting recruitment followed by predation. Mortality from predation may have been partly compensatory to pneumonia and its effects were less pronounced as alternative prey became available. Given the high rates of pneumonia-caused mortality we observed, and the apparent lack of pneumonia-causing pathogens in bighorn populations in the western Black Hills, management activities should be geared towards eliminating contact between diseased and healthy populations.

References

[1]  Buechner HK (1960) The bighorn sheep in the United States, its past, present, and future. Wildl Monogr 4: 1–174.
[2]  Singer FJ, Zeigenfuss LC, Spicer L (2001) Role of patch size, disease, and movement in rapid extinction of bighorn sheep. Conserv Biol 15: 1347–1354. doi: 10.1046/j.1523-1739.2001.99488.x
[3]  Wehausen JD, Kelley ST, Ramey RR (2011) Domestic sheep, bighorn sheep, and respiratory disease: a review of the experimental evidence. California Fish and Game 97: 7–24.
[4]  Fitzsimmons NN, Buskirk SW, Smith MH (1995) Population history, genetic variability, and horn growth in bighorn sheep. Conserv Biol 9: 314–323. doi: 10.1046/j.1523-1739.1995.9020314.x
[5]  Gaillard JM, Festa-Bianchet M, Yoccoz NG, Loison A, Toigo C (2000) Temporal variation in fitness components and population dynamics of large herbivores. Annu Rev Ecol Syst 31: 367–393. doi: 10.1146/annurev.ecolsys.31.1.367
[6]  Raithel JD, Kauffman M, Pletscher DH (2007) Impact of spatial and temporal variation in calf survival on the growth of elk populations. J Wildl Manage 71: 795–803. doi: 10.2193/2005-608
[7]  Barber-Meyer SM, Mech LD, White PJ (2008) Elk calf survival and mortality following wolf restoration to Yellowstone National Park. Wildl Monogr 169: 1–30. doi: 10.2193/2008-004
[8]  Bishop CJ, Freddy DJ, White GC, Watkins BE, Stephenson T, et al. (2007) Using vaginal implant transmitters to aid in capture of mule deer neonates. J Wildl Manage71: 945–954. doi: 10.2193/2006-123
[9]  Grovenburg TW, Swanson CC, Jacques CN, Klaver RW, Brinkman TJ, et al. (2011) Survival of white-tailed deer neonates in Minnesota and South Dakota. J Wildl Manage 75: 213–220. doi: 10.1002/jwmg.20
[10]  Shackleton DM, Shank CC, Wikeem BM (1999) Natural history of Rocky Mountain and California bighorn sheep. In: Valdez R, Krausman PR, editors. Mountain sheep of North America. Tucson: The University of Arizona Press. 78–138.
[11]  Smith JB, Walsh DP, Goldstein EJ, Parsons ZD, Karsch RC, et al.. (2013) Techniques for capturing bighorn sheep lambs. Wildl Soc Bull: In Press.
[12]  Woodard TN, Gutierrez RJ, Rutherford WH (1974) Bighorn lamb production, survival, and mortality in South-Central Colorado. J Wildl Manage 38: 771–774. doi: 10.2307/3800043
[13]  Wehausen JD, Bleich VC, Blong B, Russi TL (1987) Recruitment dynamics in a Southern-California mountain sheep population. J Wildl Manage 51: 86–98. doi: 10.2307/3801636
[14]  Cook JG, Arnett E, Irwin LL, Lindzey FG (1990) Population dynamics of two transplanted bighorn sheep herds in southcentral Wyoming. Proceedings of the Biennial Symposium of the Northern Wild Sheep and Goat Council 7: 19–30.
[15]  Cassirer EF, Sinclair AE (2007) Dynamics of pneumonia in a bighorn sheep metapopulation. J Wildl Manage 71: 1080–1088. doi: 10.2193/2006-002
[16]  Sirochman MA, Woodruff KJ, Grigg JL, Walsh DP, Huyvaert KP, et al. (2012) Evaluation of management treatments intended to increase lamb recruitment in a bighorn sheep herd. J Wildl Dis 48: 781–784. doi: 10.7589/0090-3558-48.3.781
[17]  Onderka DK, Wishart WD (1984) A major bighorn sheep die-off from pneumonia in southern Alberta. Proceedings of the Biennial Symposium of the Northern Wild Sheep and Goat Council 4: 356–363.
[18]  Festa-Bianchet M (1988) A pneumonia epizootic in bighorn sheep, with comments on preventive management. Proceedings of the Biennial Symposium of the Northern Wild Sheep and Goat Council 6: 66–76.
[19]  Ross PI, Jalkotzy M, Festa-Bianchet M (1997) Cougar predation on bighorn sheep in southwestern Alberta during winter. Can J Zool 75: 771–775. doi: 10.1139/z97-098
[20]  Wehausen JD (1996) Effects of mountain lion predation on bighorn sheep in the Sierra Nevada and Granite Mountains of California. Wildl Soc Bull 24: 471–479.
[21]  Rominger EM, Whitlaw HA, Weybright DL, Dunn WC, Ballard WB (2004) The influence of mountain lion predation on bighorn sheep translocations. J Wildl Manage 68: 993–999. doi: 10.2193/0022-541x(2004)068[0993:tiomlp]2.0.co;2
[22]  Festa-Bianchet M, Coulson T, Gaillard JM, Hogg J, Pelletier F (2006) Stochastic predation events and population persistence in bighorn sheep. Proc R Soc B Biol Sci 273: 1537–1543. doi: 10.1098/rspb.2006.3467
[23]  Kamler JF, Lee RM, deVos JC, Ballard WB, Whitlaw HA (2002) Survival and cougar predation of translocated bighorn sheep in Arizona. J Wildl Manage 66: 1267–1272. doi: 10.2307/3802959
[24]  South Dakota Department of Game, Fish and Parks (2007). Rocky mountain bighorn sheep management plan South Dakota. Available: http://gfp.sd.gov/wildlife/management/pl?ans/. Accessed 7 June 2013.
[25]  Valdez R, Krausman PR (1999) Description, distribution, and abundance of mountain sheep in North America. In: Valdez R, Krausman PR, editors. Mountain Sheep of North America. Tucson: University of Arizona Press. 3–22.
[26]  Zimmerman TJ (2008) Evaluation of an augmentation of Rocky Mountain bighorn sheep at Badlands National Park, South Dakota. Disseration. Brookings: South Dakota State University.
[27]  Froiland SG (1990) Natural History of the Black Hills and Badlands. Sioux Falls: The Center for Western Studies. 225 p.
[28]  USGS Gap Analysis Program. 2013. National GAP analysis landcover data portal. Available: http://gapanalysis.usgs.gov/gaplandcover?/data/download/. Accessed 13 March 2013.
[29]  National Oceanic and Atmospheric Administration (2013) Summary of monthly normals 1981–2010. Available: http://www.ncdc.noaa.gov/cdo-web/search. Accessed 13 March 2013.
[30]  Krausman PR, Bowyer RT (2003) Mountain Sheep. In: Feldhamer GA, Thompson BC, Chapman JA, editors. Wild mammals of North America: biology, management, and conservation. Baltimore: Johns Hopkins University Press. 1095–1115.
[31]  Bishop CJ, Anderson CR, Walsh DP, Bergman EJ, Kuechle P, et al. (2011) Effectiveness of a redefined vaginal implant transmitter in mule deer. J Wildl Manage 75: 1797–1806. doi: 10.1002/jwmg.229
[32]  Sikes RS, Gannon WL (2011) Animal Care and Use Committee of the American Society of Mammalogists (2011) Guidelines of the American Society of Mammalogists for the use of wild animals in research. J Mammal 92: 235–253. doi: 10.1644/10-mamm-f-355.1
[33]  White GC, Burnham KP (1999) Program MARK: survival estimation from populations of marked animals. Bird Study 46: 120–138. doi: 10.1080/00063659909477239
[34]  Burnham KP, Anderson DR (2002) Model selection and inference:a practical information-theoretic approach. New York: Springer-Verlag. 488 p.
[35]  Devrie JH, Citta JJ, Lindberg MS, Howerter DW, Anderson MG (2003) Breeding-season survival of mallard females in the prairie pothole region of Canada. J Wildl Manage 67: 551–563. doi: 10.2307/3802713
[36]  Bishop CJ, White GC, Lukacs PM (2008) Evaluating dependence among mule deer siblings in fetal and neonatal survival analyses. J Wildl Manage 72: 1085–1093. doi: 10.2193/2007-423
[37]  Heisey DM, Patterson BR (2006) A review of methods to estimate cause-specific mortality in presence of competing risks. J Wildl Manage 70: 1544–1555. doi: 10.2193/0022-541x(2006)70[1544:aromte]2.0.co;2
[38]  Sargeant GA (2011) wild1: R Tools for Wildlife Research and Management. R package version 1.09.
[39]  Therneau T (2013) A Package for Survival Analysis in S. R package version 2.37–4, Accessed 9 June 2013.
[40]  Lent PC (1974) Mother-infant relationships in ungulates. In: Morges: IUCN Geist V, Walther F, editors. The behaviour of ungulates and its relation to management. Publication24: 14–55.
[41]  Enk TA, Picton HD, Williams JS (2001) Factors limiting a bighorn sheep population in Montana following a dieoff. Northwest Sci 75: 280–291.
[42]  Miller MW, Conlon JA, McNeil HJ, Bulgin JM, Ward ACS (1997) Evaluation of a multivalent Pasteurella haemolytica vaccine in bighorn sheep: safety and serologic responses. J Wildl Dis 33: 738–748. doi: 10.7589/0090-3558-33.4.738
[43]  Schmitz LE (2010) Mortality and habitat use of mule deer fawns in the southern Black Hills, South Dakota, 2003–2007. Pierre: South Dakota Game, Fish, and Parks Report No. 2010–05: 1–64.
[44]  Schmitz LE (2006) Ecology of white-tailed deer in South Dakota: growth, survival, and winter nutrition. Dissertation. Brookings: South Dakota State University.
[45]  Logan KA, Sweanor LL (2001) Desert puma: evolutionary ecology and conservation of an enduring carnivore. Washington: Island Press. 1–463.
[46]  Theurer ME, Anderson DE, White BJ, Miesner MD, Mosier DA, et al. (2013) Effect of Mannheimia haemolytica pneumonia on behavior and physiologic responses of calves during high ambient environmental temperatures. J Anim Sci 8: 3917–3929. doi: 10.2527/jas.2012-5823
[47]  Singer FJ, Williams ES, Miller MW, Zeigenfuss LC (2000) Population growth, fecundity, and survivorship in recovering populations of bighorn sheep. Restor Ecol 8: 75–84. doi: 10.1046/j.1526-100x.2000.80067.x
[48]  Monello RJ, Murray DL, Cassirer EF (2001) Ecological correlates of pneumonia epizootics in bighorn sheep herds. Can J Zool 79: 1423–1432. doi: 10.1139/cjz-79-8-1423
[49]  Cassirer EF, Rudolph KM, Fowler P, Coggins VL, Hunter DL, et al. (2001) Evaluation of ewe vaccination as a tool for increasing bighorn lamb survival following pasteurellosis epizootics. J Wildl Dis 37: 49–57. doi: 10.7589/0090-3558-37.1.49
[50]  Subramaniam R, Shanthalingam S, Bavananthasivam J, Kugadas A, Potter KA, et al. (2011) A multivalent Mannheimia-Bibersteinia vaccine protects bighorn sheep against Mannheimia haemolytica challenge. Clin Vaccine Immunol 18: 1689–1694. doi: 10.1128/cvi.05276-11

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