Spatial and temporal patterns of sarcoptic mange in wombats using the citizen science tool, WomSAT

Abstract

There is currently limited information regarding the levels of infection and distribution of sarcoptic mange in the wombat population throughout Australia. We analyzed cases of sarcoptic mange in bare-nosed wombats reported into WomSAT, a website and mobile phone application where citizen scientists can upload sightings of wombats, burrows, and sarcoptic mange status. We used Maxent software to predict locations and the environmental factors associated with sarcoptic mange occurrence in bare-nosed wombats. A total of 1379 sarcoptic mange-infected and 3043 non-sarcoptic mange-infected wombats were reported by 674 and 841 citizen scientists, respectively. Of all the wombats reported to WomSAT from 2015 to 2019, 31.2% were infected with sarcoptic mange. Sarcoptic mange in bare-nosed wombats was reported in 502 suburbs across four states. New South Wales had the highest number of sarcoptic mange cases reported to WomSAT. There was no statistically significant seasonal variation of sarcoptic mange levels in bare-nosed wombats. The model showed that Euclidean distance to urban areas was the highest contributing factor for sarcoptic mange occurrence. As distance to urban areas decreased, the suitability for sarcoptic mange increased. Annual precipitation was the next contributing factor in the model, with higher rainfall of 400–700 mm correlating to an increase in sarcoptic mange occurrence. As the data collected to date have provided the largest-scale contemporary distribution of sarcoptic mange in wombats, data should continue to be collected by citizen scientists as it is an easy and low-cost method of collecting data over large areas. We suggest targeting the identified hotspot areas and more site-specific studies for studying and mitigating sarcoptic mange in bare-nosed wombats.

Keywords

bare-nosed wombats / habitat suitability / Maxent / modeling

References

[1] Almberg ES, Cross PC, Dobson AP et al. (2015). Social living mitigates the costs of a chronic illness in a cooperative carnivore. Ecology Letters 18, 660–667.

[2] Australian Bureau of Statistics (2021). Digital Boundary Files (Jul7 2021–June 2026). [Cited 20 Apr 2023.] Available from URL: https://www.abs.gov.au/statistics/standards/australian-statistical-geography-standard-asgs-edition-3/jul2021-jun2026/access-and-downloads/digital-boundary-files

[3] Burgess LG, Richards SA, Driessen MM, Wilkinson V, Amin RJ, Carver S (2023). Fine-scale landscape epidemiology: Sarcoptic mange in bare-nosed wombats (Vombatus ursinus). Transboundary and Emerging Diseases 2023, 2955321.

[4] Department of Primary Industries, Parks, Water and Environment (2020). Research and monitoring report synopsis–Wombats and sarcoptic mange in Tasmania. [Cited 1 May 2023.] Available from URL: https://nre.tas.gov.au/Documents/M662343_Revised_M629593_Wombat%20and%20wombat%20mange%20status_Synopsis_June%202020.pdf

[5] Driessen MM, Gales R, Visoiu M, Dewar E, Hehn K (2018). Prevalence of wombat mange at Cape Portland, northeast Tasmania. Nature Conservation Report 18/7. Department of Primary Industries, Parks, Water and Environment, Hobart.

[6] Driessen MM, Dewar E, Carver S, Gales R (2022). Conservation status of common wombats in Tasmania I: Incidence of mange and its significance. Pacific Conservation Biology 28, 103–114.

[7] Elith J, Phillips SJ, Hastie T, Dudík M, Chee YE, Yates CJ (2011). A statistical explanation of MaxEnt for ecologists. Diversity and Distributions 17, 43–57.

[8] ESRI (2021). ‘ArcGIS Desktop: Release 10.3.1.’ Environmental Systems Research Institute: Redlands, CA.

[9] Evans MC, Macgregor C, Jarman PJ (2006). Diet and feeding selectivity of common wombats. Wildlife Research 33, 321–330.

[10] Fick SE, Hijmans RJ (2017). WorldClim 2: New 1-km spatial resolution climate surfaces for global land areas. International Journal of Climatology 37, 4302–4315.

[11] Fleming P, Corbett L, Harden B, Thomson P (2001). Managing the Impacts of Dingoes and Other Wild Dogs. Bureau of Rural Sciences, Canberra, Australia.

[12] Fleming PA, Anderson H, Prendergast AS, Bretz MR, Valentine LE, Hardy GES (2014). Is the loss of Australian digging mammals contributing to a deterioration in ecosystem function? Mammal Review 44, 94–108.

[13] Fraser TA, Carver S, Martin AM, Mounsey K, Polkinghorne A, Jelocnik M (2018). A Sarcoptes scabiei specific isothermal amplification assay for detection of this important ectoparasite of wombats and other animals. PeerJ 6, e5291.

[14] Fraser TA, Charleston M, Martin A, Polkinghorne A, Carver S (2016). The emergence of sarcoptic mange in Australian wildlife: An unresolved debate. Parasites and Vectors 9, 316.

[15] Gakuya F, Ombui J, Maingi N et al. (2012). Sarcoptic mange and cheetah conservation in Masai Mara (Kenya): Epidemiological study in a wildlife/livestock system. Parasitology 139, 1587–1595.

[16] Gray DF (1937). Sarcoptic mange affecting wild fauna in New South Wales. Australian Veterinary Journal 13, 154–155.

[17] Guy TR, Kirkpatrick JB (2021). Environmental associations and effects of disturbances by common wombats in alpine Tasmania. Austral Ecology 46, 1392–1403.

[18] Hartley M, English A (2005). Sarcoptes scabei var. wombati infection in the common wombat (Vombatus ursinus). European Journal of Wildlife Research 51, 117–121.

[19] Holz P, Orbell G, Beveridge I (2011). Sarcoptic mange in a wild swamp wallaby (Wallabia bicolor). Australian Veterinary Journal 89, 458–459.

[20] Kramer-Schadt S, Niedballa J, Pilgrim JD et al. (2013). The importance of correcting for sampling bias in MaxEnt species distribution models. Diversity and Distributions 19, 1366–1379.

[21] Lawson B, Petrovan SO, Cunningham AA (2015). Citizen science and wildlife disease surveillance. Ecohealth 12, 693–702.

[22] López-Olvera JR, Serrano E, Armenteros A et al. (2015). Sex-biased severity of sarcoptic mange at the same biological cost in a sexually dimorphic ungulate. Parasites & Vectors 8, 583.

[23] Martin AM, Burridge CP, Ingram J, Fraser TA, Carver S, Flory L (2018). Invasive pathogen drives host population collapse: Effects of a travelling wave of sarcoptic mange on bare-nosed wombats. Journal of Applied Ecology 55, 331–341.

[24] Martin R, Handasyde K, Skerratt L (1998). Current distribution of sarcoptic mange in wombats. Australian Veterinary Journal 76, 411–414.

[25] Matthews A, Green K (2012). Seasonal and altitudinal influences on the home range and movements of common wombats in the Australian Snowy Mountains. Journal of Zoology 287, 24–33.

[26] Mayadunnage S, Stannard HJ, West P, Old JM (2023). Identification of roadkill hotspots and the factors affecting wombat vehicle collisions using the citizen science tool, WomSAT. Australian Mammalogy 45, 53–61.

[27] McLelland DJ, Youl JM (2005). Sarcoptic mange in agile wallabies (Macropus agilis) in the Northern Territory. Australian Veterinary Journal 83, 744–745.

[28] Nguyen HKD, Fielding MW, Buettel JC, Brook BW (2019). Habitat suitability, live abundance and their link to road mortality of Tasmanian wildlife. Wildlife Research 46, 236–246.

[29] Obendorf DL (1983). Causes of mortality and morbidity of wild koalas, Phascolarctos cinereus (Goldfuss), in Victoria, Australia. Journal of Wildlife Diseases 19, 123–131.

[30] Old JM, Hunter NE, Wolfenden J (2018a). Who utilises bare-nosed wombat burrows? Australian Zoologist 39, 409–413.

[31] Old JM, Sengupta C, Narayan E, Wolfenden J (2018b). Sarcoptic mange in wombats—A review and future research directions. Transboundary and Emerging Diseases 65, 399–407.

[32] Pearce J, Ferrier S (2000). An evaluation of alternative algorithms for fitting species distribution models using logistic regression. Ecological Modelling 128, 127–147.

[33] Pence D, Ueckermann E (2002). Sarcoptic mange in wildlife. Revue Scientifique et Technique (International Office of Epizootics) 21, 385–398.

[34] Pérez JM, Ruiz-Martínez I, Granados JE, Soriguer RC, Fandos P (1997). The dynamics of sarcoptic mange in the ibex population of Sierra Nevada in Spain–influence of climatic factors. Journal of Wildlife Research 2, 86–89.

[35] Phillips SJ, Anderson RP, Schapire RE (2006). Maximum entropy modeling of species geographic distributions. Ecological Modelling 190, 231–259.

[36] Phillips SJ, Dudík M, Elith J et al. (2009). Sample selection bias and presence-only distribution models: Implications for background and pseudo-absence data. Ecological Applications 19, 181–197.

[37] Rafuse DJ (2021). A Maxent predictive model for hunter-gatherer sites in the southern Pampas, Argentina. Open Quaternary 7, 6.

[38] Ringwaldt EM, Brook BW, Buettel JC et al. (2023). Host, environment, and anthropogenic factors drive landscape dynamics of an environmentally transmitted pathogen: Sarcoptic mange in the bare-nosed wombat. Journal of Animal Ecology 92, 1786–1801.

[39] Roger E, Ramp D (2009). Incorporating habitat use in models of fauna fatalities on roads. Diversity and Distributions 15, 222–231.

[40] Ruykys L, Taggart DA, Breed WG, Schultz D (2009). Sarcoptic mange in southern hairy-nosed wombats (Lasiorhinus latifrons): Distribution and prevalence in the Murraylands of South Australia. Australian Journal of Zoology 57, 129–138.

[41] Santori C, Spencer R-J, Van Dyke JU, Thompson MB (2018). Road mortality of the eastern long-necked turtle (Chelodina longicollis) along the Murray River, Australia: An assessment using citizen science. Australian Journal of Zoology 66, 41–49.

[42] Skelton CJ, Cook AS, West P, Spencer R-J, Old JM (2019). Building an army of wombat warriors: Developing and sustaining a citizen science project. Australian Mammalogy 41, 186–195.

[43] Skerratt LF (1998). Diseases and parasites of the common wombat Vombatus ursinus in the Healesville area of Victoria. In: Wells RT, Pridmore PA, eds. Wombats. Surrey Beatty and Sons, Chipping Norton, pp. 317–328.

[44] Skerratt LF, Middleton D, Beveridge I (1999). Distribution of life cycle stages of Sarcoptes scabiei var wombati and effects of severe mange on common wombats in Victoria. Journal of Wildlife Diseases 35, 633–646.

[45] Stannard HJ, Wolfenden J, Hermsen EM, Vallin BT, Hunter NE, Old JM (2021). Incidence of sarcoptic mange in bare-nosed wombats (Vombatus ursinus). Australian Mammalogy 43, 85–95.

[46] Thorley RK, Old JM (2020). Distribution, abundance and threats to bare-nosed wombats (Vombatus ursinus). Australian Mammalogy 42, 249–256.

[47] Thornett E, Ostendorf B, Taggart DA (2017). Interspecies co-use of southern hairy-nosed wombat (Lasiorhinus latifrons) burrows. Australian Mammalogy 39, 205–212.

[48] Wicks RM, Clark P, Hobbs RP (2007). Clinical dermatitis in a southern brown bandicoot (Isoodon obesulus) associated with the mite Sarcoptes scabiei. Comparative Clinical Pathology 16, 271–274.

[49] Young N, Carter L, Evangelista P (2011). A MaxEnt Model v3.3.3e Tutorial (ArcGIS v10). Available from URL: http://ibis.colostate.edu/WebContent/WS/ColoradoView/TutorialsDownloads/A_Maxent_Model_v7.pdf

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