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11 results for “bare-nosed wombat”
Fig. 2. 3 in Environmental suitability of bare-nosed wombat burrows for Sarcoptes scabiei
Fig. 2. 3-Dimensional models of A) S. scabiei mite survival from laboratory data (Arlian et al., 1984a), and B) the estimated mite survival from GAM fit to the laboratory data (R2 = 0.834).
Fig. 5. A in Environmental suitability of bare-nosed wombat burrows for Sarcoptes scabiei
Fig. 5. A) Estimated mite survival within burrows across the eastern (low mange prevalence) and western (high mange prevalence) survey areas. B) The relationship between estimated mite survival and the elevation of burrows from the eastern and western areas.
Fig. 4 in Environmental suitability of bare-nosed wombat burrows for Sarcoptes scabiei
Fig. 4. Relationship of burrow A) length, B) depth, C) elevation, and D) field trip number, to estimated mite survival time within burrow.
Fig. 3 in Environmental suitability of bare-nosed wombat burrows for Sarcoptes scabiei
Fig. 3. Temporal profiles of A) air temperature, B) relative humidity, and C) estimated mite survival within wombat burrows and outside at the burrow entrances. D) Average estimated mite survival time at burrow entrances and within burrows (n = 33).
Fig. 6 in Environmental suitability of bare-nosed wombat burrows for Sarcoptes scabiei
Fig. 6. Seasonal variation in estimated mite survival within wombat burrows. Note: in winter, the burrows were sampled with a different method (data loggers) compared to the spring and summer (robotic vehicle, the WomBot).
Fig. 1 in Environmental suitability of bare-nosed wombat burrows for Sarcoptes scabiei
Fig. 1. Location of study area at Musselroe Wind Farm, Cape Portland. Map of DPIPWE spotlight survey transect routes, red: west transect, blue: east transect. (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)
Abundance and population growth estimates for bare-nosed wombats
<p><span>Wildlife managers often rely on population estimates, but estimates can be challenging to obtain for geographically widespread species. Spotlight surveys provide abundance data for many species and, when conducted over wide spatial scales, have the potential to provide population estimates of geographically widespread species. The bare-nosed wombat (<em>Vombatus</em> <em>ursinus</em>) has a broad geographic range and is subject to spotlight surveys. We used 19 years (2002–2020) of annual spotlight surveys to provide the first estimates of population abundance for two of the three extant bare-nosed wombat subspecies: <em>V. u. ursinus</em> on Flinders Island; and <em>V. u. tasmaniensis</em> on the Tasmanian mainland. Using distance sampling methods, we estimated annual rates of change and 2020 population sizes for both sub-species. Tasmanian mainland surveys included habitat data, which allowed us to also look for evidence of habitat associations for <em>V. u. tasmaniensis</em>. The average wombat density estimate was higher on Flinders Island (0.42 ha<sup>-1</sup>, 95% CrI = 0.25 – 0.79) than on the Tasmanian mainland (0.11 ha<sup>-1</sup>, CrI = 0.07 – 0.19) and both wombat subspecies increased over the 19-year survey period with an estimated annual growth rate of 2.90% (CrI = -1.7 – 7.3) on Flinders Island and 1.20% (CrI = -1.1 – 2.9) on mainland Tasmania. Habitat associations for <em>V. u. tasmaniensis</em> were weak, possibly owing to survey design; however, we detected regional variation in density for this subspecies. We estimated the population size of <em>V. u. ursinus </em>to be 71,826 (CrI = 43,913 – 136,761) on Flinders Island, which when combined with a previously published estimate of 2,599 (CI = 2,254 – 2,858) from Maria Island, where the subspecies was introduced, provides a total population estimate. We also estimated 840,665 (CrI = 531,104 – 1,201,547) <em>V. u. tasmaniensis </em>on mainland Tasmania. These estimates may be conservative, owing to individual heterogeneity in when wombats emerge from burrows. Although these two sub-species are not currently threatened, our population estimates provide an important reference when assessing their population status in the future, and demonstrate how spotlight surveys can be valuable to inform management of geographically widespread species.</span></p>
Abundance and population growth estimates for bare-nosed wombats
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Data from: Isolation, marine transgression, and translocation of the bare-nosed wombat (Vombatus ursinus)
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Data from: Invasive pathogen drives host population collapse: effects of a travelling wave of sarcoptic mange on bare-nosed wombats
1.Emerging and invasive pathogens can have long-lasting impacts on susceptible wildlife populations, including localised collapse and extirpation. Management of threatening disease is of widespread interest and requires knowledge of spatiotemporal patterns of pathogen spread. 2.Theory suggests disease spread often occurs via two patterns: homogenous mixing and travelling waves. However, high resolution empirical data demonstrating localised (within population) disease spread patterns are rare. 3.This study examined the spread of sarcoptic mange (aetiological agent Sarcoptes scabiei) in a population of bare-nosed wombats (Vombatus ursinus), and investigated whether pathogen spread occurred by homogenous mixing or a travelling wave. 4.Using seven years of population surveys and four years of disease severity surveys, we show that mange was first detected in the east of a wombat population in northern Tasmania, and progressed westward as a travelling wave. Wombat mortality rates reached 100% behind the wave, with a 94% decline in overall wombat abundance within the park. 5.Synthesis and applications. Globally distributed pathogens may have severe impacts on susceptible host species. This is the first study to quantify population level impacts of sarcoptic mange upon bare-nosed wombats, showing a wave of mange disease which resulted in a dramatic population decline. Successful management of the spread of this and similar pathogens may hinge on the capacity to establish transmission barriers at local or between-population scales.
Data from: Invasive pathogen drives host population collapse: effects of a travelling wave of sarcoptic mange on bare-nosed wombats
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