An Integrated Ecological Niche Modelling Framework for Risk Mapping of Peste des Petits Ruminants Virus Exposure in African Buffalo (Syncerus caffer) in the Greater Serengeti-Mara Ecosystem
Abstract
:1. Introduction
2. Materials and Methods
2.1. Study Area
2.2. Data Sources and Preparation
2.2.1. PPRV Seropositive Buffalos in the GSME
2.2.2. Buffalo Presence Points in the GSME
2.2.3. Selection of Predictor Variables of PPRV Antibody Positive Buffalo Herds
2.2.4. Collinearity Analysis
2.3. Modelling Habitat Suitability for PPRV and Buffalo Occurrence
3. Results
3.1. Variable Contribution, Model Performance, and Response Curves
3.1.1. Buffalo Model
3.1.2. PPRV Antibody Positive Buffalo Herd Model
3.2. Habitat Suitability Maps
3.2.1. Buffalo Suitability Map
3.2.2. PPRV Antibody Positive Buffalo Herd Suitability Map
3.3. PPRV Antibody Positive Herd Suitability Considering the <50 PI Cut-Off Value
4. Discussion
Supplementary Materials
Author Contributions
Funding
Institutional Review Board Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
- Gibbs, E.P.; Taylor, W.P.; Lawman, M.J.; Bryant, J. Classification of peste des petits ruminants virus as the fourth member of the genus Morbillivirus. Intervirology 1979, 11, 268–274. [Google Scholar] [CrossRef] [PubMed]
- Muniraju, M.; Munir, M.; Parthiban, A.R.; Banyard, A.C.; Bao, J.; Wang, Z.; Ayebazibwe, C.; Ayelet, G.; El Harrak, M.; Mahapatra, M.; et al. Molecular evolution of peste des petits ruminants virus. Emerg. Infect. Dis. 2014, 20, 2023–2033. [Google Scholar] [CrossRef]
- Rahman, A.U.; Wensman, J.J.; Abubakar, M.; Shabbir, M.Z.; Rossiter, P. Peste des petits ruminants in wild ungulates. Trop. Anim. Health Prod. 2018, 50, 1815–1819. [Google Scholar] [CrossRef] [PubMed]
- Parida, S.; Muniraju, M.; Altan, E.; Baazizi, R.; Raj, G.D.; Mahapatra, M. Emergence of PPR and its threat to Europe. Small Rumin. Res. 2016, 142, 16–21. [Google Scholar] [CrossRef] [PubMed]
- Jones, B.A.; Rich, K.M.; Mariner, J.C.; Anderson, J.; Jeggo, M.; Thevasagayam, S.; Cai, Y.; Peters, A.R.; Roeder, P. The economic impact of eradicating peste des petits ruminants: A benefit-cost analysis. PLoS ONE 2016, 11, e0149982. [Google Scholar] [CrossRef] [PubMed]
- FAO; OIE. Global Strategy for the Control and Eradication of PPR; FAO: Rome, Italy, 2015. [Google Scholar]
- Baron, M.D.; Diop, B.; Njeumi, F.; Willett, B.J.; Bailey, D. Future research to underpin successful peste des petits ruminants virus (PPRV) eradication. J. Gen. Virol. 2017, 98, 2635–2644. [Google Scholar] [CrossRef] [PubMed]
- Marashi, M.; Masoudi, S.; Moghadam, M.K.; Modirrousta, H.; Marashi, M.; Parvizifar, M.; Dargi, M.; Saljooghian, M.; Homan, F.; Hoffmann, B.; et al. Peste des petits ruminants virus in vulnerable wild small ruminants, Iran, 2014–2016. Emerg. Infect. Dis. 2017, 23, 704–706. [Google Scholar] [CrossRef]
- Hoffmann, B.; Wiesner, H.; Maltzan, J.; Mustefa, R.; Eschbaumer, M.; Arif, F.A.; Beer, M. Fatalities in wild goats in Kurdistan associated with peste des petits ruminants virus. Transbound. Emerg. Dis. 2012, 59, 173–176. [Google Scholar] [CrossRef]
- Pruvot, M.; Fine, A.E.; Hollinger, C.; Strindberg, S.; Damdinjav, B.; Buuveibaatar, B.; Chimeddorj, B.; Bayandonoi, G.; Khishgee, B.; Sandag, B.; et al. Outbreak of peste des petits ruminants among critically endangered Mongolian saiga and other wild ungulates, Mongolia, 2016–2017. Emerg. Infect. Dis. 2020, 26, 51–62. [Google Scholar] [CrossRef]
- Benfield, C.; Hill, S.; Shatar, M.; Shiilegdamba, E.; Damdinjav, B.; Fine, A.; Willett, B.; Kock, R.; Bataille, A. Molecular epidemiology of peste des petits ruminants virus emergence in critically endangered Mongolian saiga antelope and other wild ungulates. Virus Evol. 2021, 7, veab062. [Google Scholar] [CrossRef]
- Aguilar, X.F.; Fine, A.E.; Pruvot, M.; Njeumi, F.; Walzer, C.; Kock, R.; Shiilegdamba, E. PPR virus threatens wildlife conservation. Science 2018, 362, 165–166. [Google Scholar] [CrossRef] [PubMed]
- Torsson, E.; Kgotlele, T.; Berg, M.; Mtui-Malamsha, N.; Swai, E.S.; Wensman, J.J.; Misinzo, G. History and current status of peste des petits ruminants virus in Tanzania. Infect. Ecol. Epidemiol. 2016, 6, 32701. [Google Scholar] [CrossRef] [PubMed]
- Dundon, W.G.; Kihu, S.M.; Gitao, G.C.; Bebora, L.C.; John, N.M.; Oyugi, J.O.; Loitsch, A.; Diallo, A. Detection and genome analysis of a lineage III peste des petits ruminants virus in Kenya in 2011. Transbound. Emerg. Dis. 2017, 64, 644–650. [Google Scholar] [CrossRef] [PubMed]
- Swai, E.S.; Kapaga, A.; Kivaria, F.; Tinuga, D.; Joshua, G.; Sanka, P. Prevalence and distribution of Peste des petits ruminants virus antibodies in various districts of Tanzania. Vet. Res. Commun. 2009, 33, 927–936. [Google Scholar] [CrossRef] [PubMed]
- Idoga, E.S.; Armson, B.; Alafiatayo, R.; Ogwuche, A.; Mijten, E.; Ekiri, A.B.; Varga, G.; Cook, A. A review of the current status of peste des petits ruminants epidemiology in small ruminants in Tanzania. Front. Vet. Sci. 2020, 7, 592662. [Google Scholar] [CrossRef] [PubMed]
- Jones, B.A.; Mahapatra, M.; Mdetele, D.; Keyyu, J.; Gakuya, F.; Eblate, E.; Lekolool, I.; Limo, C.; Ndiwa, J.N.; Hongo, P.; et al. Peste des petits ruminants virus infection at the wildlife-livestock interface in the Greater Serengeti Ecosystem, 2015–2019. Viruses 2021, 13, 838. [Google Scholar] [CrossRef] [PubMed]
- Couacy-Hymann, E.; Koffi, M.Y.; Kouadio, V.K.; Mossoum, A.; Kouadio, L.; Kouassi, A.; Assemian, K.; Godji, P.H.; Nana, P. Experimental infection of cattle with wild type peste-des-petits-ruminants virus—Their role in its maintenance and spread. Res. Vet. Sci. 2019, 124, 118–122. [Google Scholar] [CrossRef]
- Schulz, C.; Fast, C.; Wernery, U.; Kinne, J.; Joseph, S.; Schlottau, K.; Jenckel, M.; Höper, D.; Patteril, N.; Syriac, G.; et al. Camelids and cattle are dead-end hosts for peste-des-petits-ruminants virus. Viruses 2019, 11, 1133. [Google Scholar] [CrossRef]
- Mahapatra, M.; Sayalel, K.; Muniraju, M.; Eblate, E.; Fyumagwa, R.; Shilinde, L.; Mdaki, M.; Keyyu, J.; Parida, S.; Kock, R. Spillover of Peste des Petits Ruminants Virus from Domestic to Wild Ruminants in the Serengeti Ecosystem, Tanzania. Emerg. Infect. Dis. 2015, 21, 2230–2234. [Google Scholar] [CrossRef]
- Lembo, T.; Oura, C.; Parida, S.; Hoare, R.; Frost, L.; Fyumagwa, R.; Kivaria, F.; Chubwa, C.; Kock, R.; Cleaveland, S.; et al. Peste des petits ruminants infection among cattle and wildlife in northern Tanzania. Emerg. Infect. Dis. 2013, 19, 2037–2040. [Google Scholar] [CrossRef]
- Roug, A.; Muse, E.A.; Clifford, D.L.; Larsen, R.; Paul, G.; Mathayo, D.; Mpanduji, D.; Mazet, J.A.K.; Kazwala, R.; Kiwango, H.; et al. Seasonal movements and habitat use of African buffalo in Ruaha National Park, Tanzania. BMC Ecol. 2020, 20, 6. [Google Scholar] [CrossRef] [PubMed]
- Chowell, G.; Rothenberg, R.B. Spatial infectious disease epidemiology: On the cusp. BMC Med. 2018, 16, 192. [Google Scholar] [CrossRef] [PubMed]
- Stevens, K.B.; Pfeiffer, D.U. Spatial modelling of disease using data- and knowledge-driven approaches. Spat. Spatio-Temporal Epidemiol. 2011, 2, 125–133. [Google Scholar] [CrossRef] [PubMed]
- Elith, J.; Leathwick, J.R. Species distribution models: Ecological explanation and prediction across space and time. Annu. Rev. Ecol. Evol. Syst. 2009, 40, 677–697. [Google Scholar] [CrossRef]
- Peterson, A. Ecologic Niche Modeling and spatial patterns of disease transmission. Emerg. Infect. Dis. 2006, 12, 1822–1826. [Google Scholar] [CrossRef] [PubMed]
- La Sala, L.F.; Burgos, J.M.; Blanco, D.E.; Stevens, K.B.; Fernández, A.R.; Capobianco, G.; Tohmé, F.; Pérez, A.M. Spatial modelling for low pathogenicity avian influenza virus at the interface of wild birds and backyard poultry. Transbound. Emerg. Dis. 2019, 66, 1493–1505. [Google Scholar] [CrossRef] [PubMed]
- Conley, A.K.; Fuller, D.O.; Haddad, N.; Hassan, A.N.; Gad, A.M.; Beier, J.C. Modeling the distribution of the West Nile and Rift Valley fever vector Culex pipiens in arid and semi-arid regions of the Middle East and North Africa. Parasit. Vectors 2014, 7, 289. [Google Scholar] [CrossRef]
- Sindato, C.; Stevens, K.B.; Karimuribo, E.D.; Mboera, L.E.; Paweska, J.T.; Pfeiffer, D.U. Spatial heterogeneity of habitat suitability for Rift Valley fever occurrence in Tanzania: An ecological niche modelling approach. PLoS Negl. Trop. 2016, 10, e0005002. [Google Scholar] [CrossRef]
- Escobar, L.E. Ecological Niche Modeling: An introduction for veterinarians and epidemiologists. Front. Vet. Sci. 2020, 7, 519059. [Google Scholar] [CrossRef]
- Ruget, A.S.; Tran, A.; Waret-Szkuta, A.; Moutroifi, Y.O.; Charafouddine, O.; Cardinale, E.; Cêtre-Sossah, C.; Chevalier, V. Spatial multicriteria evaluation for mapping the risk of occurrence of peste des petits ruminants in Eastern Africa and the Union of the Comoros. Front. Vet. Sci. 2019, 6, 455. [Google Scholar] [CrossRef]
- Ma, J.; Gao, X.; Liu, B.; Chen, H.; Xiao, J.; Wang, H. Peste des petits ruminants in China: Spatial risk analysis. Transbound. Emerg. Dis. 2019, 66, 1784–1788. [Google Scholar] [CrossRef] [PubMed]
- Assefa, A.; Tibebu, A.; Bihon, A.; Yimana, M. Global ecological niche modelling of current and future distribution of peste des petits ruminants virus (PPRv) with an ensemble modelling algorithm. Transbound. Emerg. Dis. 2021, 68, 3601–3610. [Google Scholar] [CrossRef] [PubMed]
- Phillips, S.J.; Anderson, R.P.; Schapire, R.E. Maximum entropy modeling of species geographic distributions. Ecol. Modell. 2006, 190, 231–259. [Google Scholar] [CrossRef]
- Fernandez Aguilar, X.; Mahapatra, M.; Begovoeva, M.; Kalema-Zikusoka, G.; Driciru, M.; Ayebazibwe, C.; Adwok, D.S.; Kock, M.; Lukusa, J.K.; Muro, J.; et al. Peste des Petits Ruminants at the Wildlife-Livestock Interface in the Northern Albertine Rift and Nile Basin, East Africa. Viruses 2020, 12, 293. [Google Scholar] [CrossRef] [PubMed]
- May, R.; Jackson, C.; Bevanger, K.; Røskaft, E. Servicescape of the Greater Serengeti-Mara Ecosystem: Visualizing the linkages between land use, biodiversity and the delivery of wildlife-related ecosystem services. Ecosyst. Serv. 2019, 40, 101025. [Google Scholar] [CrossRef]
- Kavana, P.Y.; Mahonge, C.P.; Mtengeti, E.J.; Fyumagwa, R.; Graae, B.J.; Nielsen, M.R.; Ilomo, O. Panorama of agro-pastoralism in western Serengeti: A review and synthesis. Livest. Res. Rural Dev. 2017, 29, 15. [Google Scholar]
- Walpole, M.; Karanja, G.; Sitati, N.; Leader-Williams, N. Wildlife and People: Conflict and Conservation in Masai Mara, Kenya; IIED Wildlife and Development Series Volume 14; International Institute for Environment and Development: London, UK, 2003; pp. 1–42. [Google Scholar]
- Veldhuis, M.P.; Ritchie, M.E.; Ogutu, J.O.; Morrison, T.A.; Beale, C.M.; Estes, A.B.; Mwakilema, W.; Ojwang, G.O.; Parr, C.L.; Probert, J.; et al. Cross-boundary human impacts compromise the Serengeti-Mara ecosystem. Science 2019, 363, 1424–1428. [Google Scholar] [CrossRef] [PubMed]
- Tanzania Wildlife Research Institute. Aerial Total Count of Elephant and Buffalo in the Serengeti Ecosystem, Dry Season, 2014; TAWIRI Aerial Survey Report; Tanzania Wildlife Research Institute: Arusha, Tanzania.
- Kyale, D.M.; Kimutai, D.; Ndetei, R.; Rotiken, D.M.; Maritim, Z.K.; Leto, D. Mara Wet Season Total Aerial Count of Elephants and Other Large Animals; Technical Report; Kenya Wildlife Service: Nairobi, Kenya; World Wide Fund for Nature: Nairobi, Kenya; Narok County Government: Narok, Kenya, 2014; pp. 1–49.
- Waret-Szkuta, A.; Roger, F.; Chavernac, D.; Yigezu, L.; Libeau, G.; Pfeiffer, D.U.; Guitian, J. Peste des petits ruminants (PPR) in Ethiopia: Analysis of a national serological survey. BMC Vet. Res. 2008, 4, 34. [Google Scholar] [CrossRef]
- Cao, Z.; Jin, Y.Z.; Shen, T.; Xu, F.; Li, Y. Risk factors and distribution for peste des petits ruminants (PPR) in Mainland China. Small Rumin. Res. 2017, 162, 12–16. [Google Scholar] [CrossRef]
- Gilbert, M.; Nicolas, G.; Cinardi, G.; Van Boeckel, T.P.; Vanwambeke, S.O.; Wint, G.R.; Robinson, T.P. Global distribution data for cattle, buffaloes, horses, sheep, goats, pigs, chickens, and ducks in 2010. Sci. Data 2018, 5, 180227. [Google Scholar] [CrossRef]
- Agga, G.E.; Raboisson, D.; Walch, L.; Alemayehu, F.; Semu, D.T.; Bahiru, G.; Woube, Y.A.; Belihu, K.; Tekola, B.G.; Bekana, M.; et al. epidemiological survey of peste des petits puminants in Ethiopia: Cattle as potential sentinel for surveillance. Front. Vet. Sci. 2019, 6, 302. [Google Scholar] [CrossRef] [PubMed]
- Jung, M.; Dahal, P.R.; Butchart, S.H.M.; Donald, P.F.; De Lamo, X.; Lesiv, M.; Kapos, V.; Rondinini, C.; Visconti, P. A global map of terrestrial habitat types. Sci. Data 2020, 7, 256. [Google Scholar] [CrossRef] [PubMed]
- Fick, S.E.; Hijmans, R.J. WorldClim 2: New 1-km Spatial resolution climate surfaces for global land areas. Int. J. Climatol. 2017, 37, 4302–4315. [Google Scholar] [CrossRef]
- Naimi, B.; Araújo, M.B. sdm: A reproducible and extensible R platform for species distribution modelling. Ecography 2016, 39, 368–375. [Google Scholar] [CrossRef]
- Phillips, S.J.; Anderson, R.P.; Dudík, M.; Schapire, R.E.; Blair, M.E. Opening the black box: An open-source release of Maxent. Ecography 2017, 40, 887–893. [Google Scholar] [CrossRef]
- Phillips, S.J.; Dudík, M.; Elith, J.; Graham, C.H.; Lehmann, A.; Leathwick, J.; Ferrier, S. Sample selection bias and presence-only distribution models: Implications for background and pseudo-absence data. Ecol. Appl. 2009, 19, 181–197. [Google Scholar] [CrossRef] [PubMed]
- Venables, W.N.; Ripley, B.D. Density Estimation. In Modern Applied Statistics with S; Springer: New York, NY, USA, 2002; pp. 126–133. [Google Scholar]
- Muscarella, R.; Galante, P.J.; Soley-Guardia, M.; Boria, R.A.; Kass, J.M.; Uriarte, M.; Anderson, R.P. ENMeval: An R package for conducting spatially independent evaluations and estimating optimal model complexity for MAXENT ecological niche models. Methods Ecol. Evol. 2014, 5, 1198–1205. [Google Scholar] [CrossRef]
- Shcheglovitova, M.; Anderson, R.P. Estimating optimal complexity for ecological niche models: A jackknife approach for species with small sample sizes. Ecol. Modell. 2013, 269, 9–17. [Google Scholar] [CrossRef]
- LaHue, N.P.; Baños, J.V.; Acevedo, P.; Gortázar, C.; Martínez-López, B. Spatially explicit modeling of animal tuberculosis at the wildlife-livestock interface in Ciudad Real province, Spain. Prev. Vet. Med. 2016, 128, 101–111. [Google Scholar] [CrossRef]
- Johnson, E.E.; Escobar, L.E.; Zambrana-Torrelio, C. An ecological framework for modeling the geography of disease transmission. Trends Ecol. Evol. 2019, 34, 655–668. [Google Scholar] [CrossRef]
- Escobar, L.E.; Peterson, A.T.; Favi, M.; Yung, V.; Pons, D.J.; Medina-Vogel, G. Ecology and geography of transmission of two bat-borne rabies lineages in Chile. PLoS Negl. Trop. Dis. 2013, 7, e2577. [Google Scholar] [CrossRef] [PubMed]
- Couacy-Hymann, E.; Bodjo, C.; Danho, T.; Libeau, G.; Diallo, A. Surveillance of wildlife as a tool for monitoring rinderpest and peste des petits ruminants in West Africa. Rev. Sci. Tech. (Int. Off. Epizoot.) 2005, 24, 869–877. [Google Scholar]
- Metzger, K.L.; Sinclair, A.R.E.; Hilborn, R.; Hopcraft, J.G.C.; Mduma, S.A.R. Evaluating the protection of wildlife in parks: The case of African buffalo in Serengeti. Biodivers. Conserv. 2010, 19, 3431–3444. [Google Scholar] [CrossRef]
- Kgotlele, T.; Chota, A.; Chubwa, C.C.; Nyasebwa, O.M.; Lyimo, B.; Torsson, E.; Karimuribo, E.D.; Kasanga, C.J.; Wensman, J.J.; Misinzo, G.; et al. Detection of peste des petits ruminants and concurrent secondary diseases in sheep and goats in Ngorongoro district, Tanzania. Comp. Clin. Path. 2018, 28, 755–759. [Google Scholar] [CrossRef]
- Kgotlele, T.; Kasanga, C.J.; Kusiluka, L.J.; Misinzo, G. Preliminary investigation on presence of peste des petits ruminants in Dakawa, Mvomero district, Morogoro region, Tanzania. Onderstepoort J. Vet. Res. 2014, 81, E1–E3. [Google Scholar] [CrossRef] [PubMed]
- Jones, B.A.; Mahapatra, M.; Chubwa, C.; Clarke, B.; Batten, C.; Hicks, H.; Henstock, M.; Keyyu, J.; Kock, R.; Parida, S. Characterisation of Peste Des Petits Ruminants Disease in Pastoralist Flocks in Ngorongoro District of Northern Tanzania and Bluetongue Virus Co-Infection. Viruses 2020, 12, 389. [Google Scholar] [CrossRef] [PubMed]
- WOAH. World Animal Health Information Database (WAHIS) Interface. Available online: www.wahis.oie.int (accessed on 29 July 2021).
- Davenport, M.L.; Nicholson, S.E. On the relation between rainfall and the Normalized Difference Vegetation Index for diverse vegetation types in East Africa. Int. J. Remote Sens. 1993, 14, 2369–2389. [Google Scholar] [CrossRef]
- European Food Safety Agency. Scientific opinion on peste des petits ruminants. EFSA J. 2015, 13, 3985. [Google Scholar] [CrossRef]
- Ogutu, J.O.; Piepho, H.-P.; Said, M.Y.; Ojwang, G.O.; Njino, L.W.; Kifugo, S.C.; Wargute, P.W. Extreme wildlife declines and concurrent increase in livestock numbers in Kenya: What are the causes? PLoS ONE 2016, 11, e0163249. [Google Scholar] [CrossRef]
- Løvschal, M.; Håkonsson, D.D.; Amoke, I. Are goats the new elephants in the room? Changing land-use strategies in Greater Mara, Kenya. Land Use Policy 2019, 80, 395–399. [Google Scholar] [CrossRef]
- Phillips, S.J.; Dudík, M. Modeling of species distributions with Maxent: New extensions and a comprehensive evaluation. Ecography 2008, 31, 161–175. [Google Scholar] [CrossRef]
- Merow, C.; Smith, M.J.; Silander, J.A. A practical guide to MaxEnt for modeling species’ distributions: What it does, and why inputs and settings matter. Ecography 2013, 36, 1058–1069. [Google Scholar] [CrossRef]
- Katale, B.Z.; Mbugi, E.V.; Siame, K.K.; Keyyu, J.D.; Kendall, S.; Kazwala, R.R.; Dockrell, H.M.; Fyumagwa, R.D.; Michel, A.L.; Rweyemamu, M.; et al. Isolation and Potential for Transmission of Mycobacterium bovis at Human-livestock-wildlife Interface of the Serengeti Ecosystem, Northern Tanzania. Transbound. Emerg. Dis. 2017, 64, 815–825. [Google Scholar] [CrossRef] [PubMed]
- Tully, M.; Batten, C.; Ashby, M.; Mahapatra, M.; Parekh, K.; Parida, S.; Njeumi, F.; Willett, B.; Bataille, A.; Libeau, G.; et al. The evaluation of five serological assays in determining seroconversion to peste des petits ruminants virus in typical and atypical hosts. Sci. Rep. 2023, 13, 14787. [Google Scholar] [CrossRef]
- Kock, R.A. Rinderpest and wildlife. In Rinderpest and Peste des Petits Ruminants Virus. Plagues of Large and Small Ruminants, 1st ed.; Barret, T., Pastoret, P.-P., Tayor, W., Eds.; Academic Press: London, UK; Elsevier: London, UK, 2006; pp. 144–162. [Google Scholar]
- Roeder, P.; Mariner, J.; Kock, R. Rinderpest: The veterinary perspective on eradication. Philos. Trans. R. Soc. B Biol. Sci. 2013, 368, 20120139. [Google Scholar] [CrossRef]
- Kock, R.A. The Wildlife Domestic Animal Disease Interface—Should Africa adopt a hard or soft edge? Trans. R. Soc. S. Afr. 2004, 59, 10–14. [Google Scholar] [CrossRef]
- Kock, R.; Kebkiba, B.; Heinonen, R.; Bedane, B. Wildlife and pastoral society–shifting paradigms in disease control. Ann. N. Y. Acad. Sci. 2002, 969, 24–33. [Google Scholar] [CrossRef]
Environmental Variables | Hypothesis | Data Source |
---|---|---|
Sheep and Goat Density | Small ruminant density contributes to PPRV habitat suitability in coarse-scale models [33]. As livestock is thought to transmit PPRV to wildlife [20], sheep and goat density is an important factor in the Greater Serengeti-Mara Ecosystem (GSME). | Gridded Livestock of the World 3 database [44], downloaded from FAO GeoNetwork (http://www.fao.org/livestock-systems/global-distributions/en/ (accessed on 23 June 2021)) at a 5 arc-minute resolution (~10 km). |
Cattle Density | Cattle infection is an indicator of PPRV circulation in sheep and goats and may be a good sentinel for PPRV at the wildlife-livestock interface [45]. In general, cattle are more likely to enter protected areas than goats and sheep [35]. | Gridded Livestock of the World 3 database [44], downloaded from FAO GeoNetwork (http://www.fao.org/livestock-systems/global-distributions/en/ (accessed on 23 June 2021)) at a 5 arc-minute resolution (~10 km). |
IUCN habitat types | Buffalo distribution depends on the habitat type, and consequently, higher probabilities of PPRV occurrence in buffalo might be restricted to certain habitat types. | International Union of Conservation of Nature (IUCN) habitat classification scheme [46]. |
Temperature and rainfall | Both temperature and rainfall contribute to PPRV habitat suitability in coarse-scale ENMs, but it is unknown in African buffalo [32,33,43]. Since important mechanisms for PPRV transmission between wildlife and livestock are the sharing of grazing and water resources [17], climatic variables might play a role in PPRV short-term persistence in the environment and shared sites [43]. | 19 bioclimatic variables related to temperature and rainfall. Worldclim website (www.worldclim.org, (accessed on 23 June 2021)) at a 30 arc-second resolution (~1 km) [47]. |
Proximity to the border of protected areas | The borders of protected areas where livestock is not allowed (Maasai Mara National Reserve and Serengeti National Park) are mainly open, and both wildlife and livestock can freely cross them, making them a potential area for high-risk PPRV transmission. | Serengeti-Mara Ecosystem Protected Areas. Serengeti GIS and Data: https://serengetidata.weebly.com/data.html (accessed on 23 June 2021) [39] at a 0.002 degrees resolution (~220 m). |
Proximity to bomas | Areas surrounding bomas where livestock are enclosed at night tend to be degraded, and wildlife does not approach them. However, the livestock from bomas in areas bordering Serengeti National Park and Maasai Mara National Reserve may be illegally taken inside the restricted areas for grazing, increasing the probability of PPRV livestock-wildlife transmission. | Boma Distribution. Serengeti GIS and Data https://serengetidata.weebly.com/data.html (accessed on 23 June 2021) [39] 0.002 degree resolution (~220 m). |
NDVI maxima | The Normalised Difference Vegetation Index (NDVI) is an indicator of green vegetation. Areas with greener and richer pastures might gather more wildlife species and livestock together, and the probability of PPRV transmission might be higher. | Serengeti GIS and Data: https://serengetidata.weebly.com/data.html [39], during 2011–2016, at 5.6 × 10−5 degrees resolution (~6.24 m) |
PPRV Seropositivity in Buffalo | Buffalo | ||
---|---|---|---|
Variable | Percent Contribution | Variable | Percent Contribution |
IUCN habitat | 71.2 | NDVI maxima | 25.6 |
Sheep and goat density | 15.4 | Proximity to borders | 23.7 |
Proximity to Bomas | 5.7 | Bio 7 | 18.8 |
Bio 4 | 4 | IUCN habitat | 8.6 |
Proximity to borders | 2.6 | Proximity to bomas | 6.4 |
Bio 13 | 1 | Sheep and goat density | 5.2 |
Cattle density | 0.1 | Bio 8 | 4.8 |
Bio 7 | 0.0 | Bio 13 | 2.3 |
Bio 18 | 0.0 | Bio 4 | 2.0 |
Bio 8 | 0.0 | Bio14 | 1.3 |
Bio 14 | 0.0 | Cattle density | 0.7 |
NDVI maxima | 0.0 | Bio 18 | 0.6 |
Disclaimer/Publisher’s Note: The statements, opinions and data contained in all publications are solely those of the individual author(s) and contributor(s) and not of MDPI and/or the editor(s). MDPI and/or the editor(s) disclaim responsibility for any injury to people or property resulting from any ideas, methods, instructions or products referred to in the content. |
© 2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Share and Cite
Carrera-Faja, L.; Yesson, C.; Jones, B.A.; Benfield, C.T.O.; Kock, R.A. An Integrated Ecological Niche Modelling Framework for Risk Mapping of Peste des Petits Ruminants Virus Exposure in African Buffalo (Syncerus caffer) in the Greater Serengeti-Mara Ecosystem. Pathogens 2023, 12, 1423. https://doi.org/10.3390/pathogens12121423
Carrera-Faja L, Yesson C, Jones BA, Benfield CTO, Kock RA. An Integrated Ecological Niche Modelling Framework for Risk Mapping of Peste des Petits Ruminants Virus Exposure in African Buffalo (Syncerus caffer) in the Greater Serengeti-Mara Ecosystem. Pathogens. 2023; 12(12):1423. https://doi.org/10.3390/pathogens12121423
Chicago/Turabian StyleCarrera-Faja, Laura, Chris Yesson, Bryony A. Jones, Camilla T. O. Benfield, and Richard A. Kock. 2023. "An Integrated Ecological Niche Modelling Framework for Risk Mapping of Peste des Petits Ruminants Virus Exposure in African Buffalo (Syncerus caffer) in the Greater Serengeti-Mara Ecosystem" Pathogens 12, no. 12: 1423. https://doi.org/10.3390/pathogens12121423