Context-dependent survival, fecundity and predicted population-level consequences of brucellosis in African buffalo Public Deposited

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This research was approved by Oregon State University and University of Georgia IACUC (Protocol numbers: OSU No.3822; UGA No.A2010 10-190-A1) and by KNP’s Scientific Services.

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  • 1. Chronic infections may have negative impacts on wildlife populations, yet their effects are difficult to detect in the absence of long-term population monitoring. Brucella abortus, the bacteria responsible for bovine brucellosis, causes chronic infections and abortions in wild and domestic ungulates, but its impact on population dynamics is not well understood. 2. We report infection patterns and fitness correlates of bovine brucellosis in African buffalo based on (1) 7 years of cross-sectional disease surveys and (2) a 4-year longitudinal study in Kruger National Park (KNP), South Africa. We then used a matrix population model to translate these observed patterns into predicted population-level effects. 3. Annual brucellosis seroprevalence ranged from 8·7% (95% CI = 1·8–15·6) to 47·6% (95% CI = 35·1–60·1) increased with age until adulthood (>6) and varied by location within KNP. Animals were on average in worse condition after testing positive for brucellosis (F = −5·074, P < 0·0001), and infection was associated with a 2·0 (95% CI = 1·1–3·7) fold increase in mortality (χ2 = 2·039, P = 0·036). Buffalo in low body condition were associated with lower reproductive success (F = 2·683, P = 0·034), but there was no association between brucellosis and pregnancy or being observed with a calf. 4. For the range of body condition scores observed in the population, the model-predicted growth rate was λ = 1·11 (95% CI = 1·02–1·21) in herds without brucellosis and λ = 1·00 (95% CI = 0·85–1·16) when brucellosis seroprevalence was 30%. 5. Our results suggest that brucellosis infection can potentially result in reduced population growth rates, but because these effects varied with demographic and environmental conditions, they may remain unseen without intensive, longitudinal monitoring.
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  • Gorsich, E. E., Ezenwa, V. O., Cross, P. C., Bengis, R. G., & Jolles, A. E. (2015). Context-dependent survival, fecundity and predicted population-level consequences of brucellosis in African buffalo. [Article in Press] Journal of Animal Ecology. doi:10.1111/1365-2656.12356
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  • description.provenance : Submitted by Open Access (openaccess@library.oregonstate.edu) on 2015-06-05T00:17:41Z No. of bitstreams: 2 Gorsich et al. Diagnostic test.pdf: 198833 bytes, checksum: b73d83556d7d807c78ad57e2c0bb4df0 (MD5) suppliment.pdf: 92408 bytes, checksum: 61da673a4e43b6a2675e370a5be35b91 (MD5)
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  • description.provenance : Made available in DSpace on 2015-06-09T21:37:52Z (GMT). No. of bitstreams: 3 gorsiche760637801.zip: 256919 bytes, checksum: f47853a6769e340db6d944e4d8220db0 (MD5) Gorsich et al. Diagnostic test.pdf: 198833 bytes, checksum: b73d83556d7d807c78ad57e2c0bb4df0 (MD5) suppliment.pdf: 92408 bytes, checksum: 61da673a4e43b6a2675e370a5be35b91 (MD5) Previous issue date: 2015-03-18

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