Journal articles on the topic 'Eastern barred bandicoot Victoria'

The eastern barred bandicoot, Perameles gunnii, formerly occurred widely in Victoria and Tasmania. Because it is endangered in Victoria, clarification of its conservation and taxonomic status in Tasmania is important. We observed the distribution and relative abundance of Perameles gunnii in nine localities in Tasmania. Comparisons of trappability in three localities sampled in March 1985 and October- November 1989 showed no decline in relative abundance. P. gunnii were more abundant in November 1989 than on two previous occasions at one location. However, six other localities where P. gunnii were abundant in 1985 showed little evidence of P. gunnii activity in 1989. Spotlighting and trapping efforts, together with anecdotal information, suggest a decline in the status of P. gunnii in the Tasmanian Midland region. The reduction of these populations could be a feature of normal demographic fluctuation or could be indicative of a real decline in the status of P. gunnii. Long-term studies to monitor seasonal and annual abundance changes in Tasmania would be useful for the management of the dwindling Victorian population, and are needed to fully determine the status of Tasmanian populations for conservation and management purposes.

Totals of 32 female and 53 male Perameles gunnii were caught 241 and 330 times, respectively, during 4340 trap-nights at Hamilton, Victoria. Residents comprised 75.3% (n = 64) of the sample. Morphometric comparison indicates that P. gunnii is sexually dimorphic. Sex ratios (expressed in percentage of females) of 55% (dependent juvenile), 45% (independent juvenile) and 37.9% (adult) were determined. The age structure of the live-trapped population changed substantially between July 1989 (42.9% juvenile, 9.5% subadult and 47.6% adult) and August 1990 (46.2% juvenile, 15.4% subadult and 34.6% adult). The mean age of captured female bandicoots increased during the study, from 9.8 months in July 1989 to 15.8 months in August 1990. In all, 24 of 32 females produced 145 pouch young in 66 litters, with a mean W e . ) litter size of 2.2+/-0.1 (n = 66). The number of females that were lactating each month was high throughout the study (85%) and peaked during spring and autumn when all captured females were lactating. Sexual maturity for males and females occurred at about 5 and 3.5 months of age, respectively. The causes of mortality of P. gunnii between 1980 and 1990 included road death (63%, n = 85), cat predation (17.8%, n = 24), disease (8.1%, n = 11), trap death (5.2%, n = 7), machinery (3.7%, n = 5) and dog predation (2.2%, n = 3). A total of 25 P. gunnii died from unknown causes. Cat predation of P. gunnii may be high amongst juveniles and subadults but low for adults. A net emigration rate of 18% of individuals known to be alive indicates that the Hamilton Municipal Tip is a source for dispersal to other subpopulations. The 1990 distribution of the population was about 169 ha, within the City of Hamilton and adjacent Shire of Dundas, Victoria. There has been a decline in distribution and some local extinctions of P. gunnii in several areas between 1988 and 1990.

Once widespread throughout Victoria, the Eastern Barred Bandicoot Perameles gunnii has declined to near extinction on the Australian mainland due to habitat loss and predation by exotic predators. The last remaining wild population occurs in Hamilton, western Victoria. Founders for a captive breeding program were taken from this population in 1988, which has persisted without predator control or supplementation from captive-bred animals. The species was reintroduced to eight sites from 1989: Woodlands Historic Park, Hamilton Community Parklands, Mooramong, Floating Islands Nature Reserve, Lake Goldsmith, Lanark, Cobra Killuc, and Mount Rothwell. Although all reintroduced populations initially increased, declines were observed during the mid- to late 1990s, from which they have never recovered. A combination of drought and predation by Red Foxes Vulpes vulpes and Cats Felis catus is thought to be responsible. Currently, management techniques focus on intensive control of Red Foxes by poison baiting and shooting, and by construction and maintenance of predator barrier-fences at some sites. Understanding which characteristics lead to the success or failure of a reintroduction site is paramount to the success of the recovery programme for this species. This paper reviews the status of all reintroduction sites, and examines characteristics that could account for the performance of their populations.

On mainland Australia, eastern barred bandicoots (Perameles gunnii) are now restricted to a single wild population at Hamilton in western Victoria, and recovery efforts are focussed on establishing new populations at reintroduction sites. The success in founding these populations has been variable, and post-release survival has not been accurately quantified. It is believed that predation by the red fox (Vulpes vulpes) is largely responsible for post-release loss of P. gunnii, despite the implementation of predator control programs at release sites. An intensive fox control program was established to protect 10 released P. gunnii at Woodlands Historic Park, near Melbourne. Monitoring of fox activity was undertaken prior to and after the release in an attempt to better understand the effectiveness of control operations. Seven bandicoots were known to be alive at the conclusion of the study five weeks after their release (and an additional animal was trapped four months later), with weight loss appearing to be an important factor in determining post-release survival. Despite constant levels of bait-take by V. vulpes, fox activity measured from sand-pads remained high. We hypothesise that the presence of suitable refugia is allowing the persistence of a low-density bandicoot population at Woodlands despite constant, high levels of fox activity.

Perameles gunnii was greatly affected by the introduction of European agriculture to the volcanic plains in Victoria. At Hamilton, agricultural areas possessed little structural complexity and supported a fairly homogeneous composition of pasture species that were generally shorter than 100 mm because of heavy stock grazing. No P. gurznii were caught in agricultural areas at Hamilton. At the Hamilton Municipal Tip, most captures and nest sites occurred where food resources and structural complexity were greatest. Descriptions of 16 diurnal nest sites indicated that a range of natural and artificial materials was used for shelter, including fallen branches, sawn timber, cement culverts, galvanised iron, and scrap metal. Earthworms were most frequently observed in faecal and stomach material, while beetles and crickets were also common. Optimal habitat for P. gunnii was defined by high structural complexity and habitat heterogeneity. Older P. gunnii may usurp optimal habitat and force subordinate adult females into sub-optimal habitat. Associated with their occupation of optimal habitat, older P. gunnii may utilise smaller nocturnal foraging areas. Analysis of the movement of P. gunnii within the Hamilton Municipal Tip indicated that males occupied significantly larger nocturnal foraging areas than females. Mean female and male home ranges (defined by Minimum Convex Polygon analysis) were 1.6 ha (n = 13, range 0.02-5.9 ha) and 4 ha (n = 18, range 0.8-9.0 ha), respectively. Also, nocturnal foraging areas were analysed on the basis of pattern of use of an area, and these were referred to as utilisation distributions. The mean utilisation distributions (defined by Minimum Area v. Probability [0.95] analysis) for females and males were 0.64 ha (n = 13, range 0.01-4.7 ha) and 4.0 ha (n = 18, range 0.01-19.6 ha), respectively. Mean female and male observed range lengths were 173 m (tz = 26, range 0-364 m) and 249 m (n = 34, range 50430 m), respectively. Mean ( +/-s.e ) observed range length (214+/-20, n = 60, range 50-430 m) was less than half the grid width (500 m), which suggests that grid size did not negatively bias the calculated home-range sizes.

The threatened, free-ranging mainland poplation, of the eastern barred bandicoot in the Hamilton area of Victoria declined to near extinction in late 1992. Demographic changes associated with the decline were monitored from 1988 to 1992. About 200 different animals were captured in 1988,49 in 1989, 16 in 1990, 3 in 1991 and 3 in 1992; capture rates (number of bandicoots captured per trap-night) displayed a similar pattern: 0.5 in 1988,O.l in 1989,0.05 in 1990,0.05 in 1991 and 0.02 in 1992. Observed declines lay within the 5% confidence intervals predicted by a demographic model for a population subjected to a removal rate of 14 animals per three months (the number removed for captive breeding by managers). Removal of bandicoots to stock a captive population hastened the demise of the wild population by about seven years; however, even in the absence of removals of animals, extinction was impending within 5-10 years. Sex ratios were male-biased in all years except 1988; the bias may have resulted from stochastic events. Average litter sizes did not differ between the 1988 population and subsequent populations, except for the 1991 population, in which a predominance of non-reproductive females contributed to a strong decline in average litter size. These demographic trends illustrate how the synergy between stochastic and deterministic forces can rapidly drive a small population to extinction.

On the Australian mainland, the eastern barred bandicoot is now restricted to the city of Hamilton in western Victoria. Mark-recapture data from four main population areas, used in a Petersen index, gave a population estimate of about 134 individuals in 1988. When areas not sampled for population abundance were included, the total estimate of abundance for Hamilton was 246 individuals. Sex ratio was significantly male-biased for adults (68%), whereas the sex ratio for pouch young was about equal (45% male). The subadult age class constituted 8.2% of the captures, and accounted for only 10% of the total number of pouch young produced. Mean litter size was 2.11. The number of lactating females and the litter size were greatest during early spring. Eighty per cent of the offspring were produced in litters of 2 or 3. Nests were observed in various substrates, including man-made structures. Selected foraging areas had few native grasses, high ground cover, tall plant height and acid soils of low to medium compaction. Bandicoots were observed feeding on invertebrates, with some orchard fruits also being eaten. Foraging patches were actively defended. Adult home ranges of males (mean 12.94 ha) were larger than those of females (mean 2.38 ha). No female moved more than 150 m whereas males moved up to 2.3 km from their initial point of capture. The major cause of adult mortality observed was road kills. Life-expectancy is probably less than 2 years. Juvenile mortality was high.

The habitat requirements of the eastern barred bandicoot, Perameles gunnii, in Tasmania were investigated with road-kill survey data and by mapping habitat features along survey routes. Road-kills of eastern barred bandicoots were most numerous in the South-east and North-west, less common in the North-east and Midlands, and very uncommon on the East Coast. Logistic regression of bandicoot presencelabsence data suggested that traffic volume is the major determinant of the road-kill distribution of eastern barred bandicoots around Tasmania. Along with traffic volume, rainfall was found to be strongly associated with the presence of eastern barred bandicoot road-kills for the state combined and for the South-east and Northeast, while along the Huon Highway in the South-east, soil depth was associated with the presence of roadkills. Favoured habitat of the eastem barred bandicoot is high-quality agricultural land with deep soils and high rainfall. It is hypothesised that clearing for agriculture in south-eastem, north-eastem and north-westem Tasmania has opened up previously unsuitable, heavily forested habitat for colonisation by eastern barred bandicoots. The resulting mosaic of pasture and remnant bush appears to provide ideal habitat for the eastern barred bandicoot. However, the majority of bandicoot habitat is found on private land, making the species vulnerable to changes in farming practices. Possible management options are briefly discussed.

The eastern barred bandicoot, Perameles gunnii, is functionally extinct on mainland Australia. Conservation of this unique taxon is dependent on reintroduction, based on a managed captive-breeding programme that provides founder animals. Existing reserves at which reintroduction has occurred are too small to support long-term genetically viable populations. Therefore, reintroductions must be made at a number of sites and the resulting populations managed as a metapopulation. A habitat-suitability model has been developed to assess and compare reintroduction sites. This is the first application of this concept to an Australian species. The model is composed of five variables-size, habitat structure, predation, shape and security-values of which are combined in a simple relationship to produce comparable mathematical statements for proposed reintroduction sites. The model has been applied to existing reserves to test their contribution to the recovery programme.

Context Assisted colonisation has the potential to protect species from intractable threats within their historical ranges. The Australian mainland subspecies of the eastern barred bandicoot (Perameles gunnii) is extinct in the wild, with surviving populations restricted to small sites protected by predator–barrier fences. PVA modelling shows that a self-sustaining bandicoot population would require an area free of the introduced red fox (Vulpes vulpes) of at least 2500ha. French Island is outside the historic range of the species, but is fox-free and contains around 9000ha of potentially suitable habitat. Aims This study will assess the suitability of French Island as a potential site for a self-sustaining eastern barred bandicoot population by conducting a 1-year assisted colonisation trial to assess habitat use, body condition and survival. Methods Between July and September 2012, 18 adult bandicoots were released. We radio-tracked bandicoots using intraperitoneal radio-transmitters for up to 122 days and trapped fortnightly. Key results The release group met the three measures of success: (1) appropriate habitat use; (2) recovery of post-release bodyweight; and (3) founder survival exceeding 100 days. Habitat use and body condition throughout the trial reflected that of mainland populations, and seven bandicoots survived longer than 100 days. Mortality was greatest in the first month, with veterinary investigations confirming two deaths due to cat predation, two deaths from toxoplasmosis and one unknown cause of death. Bandicoots that survived longer than 100 days occupied higher, drier ground than those that did not. Toxoplasmosis cases were associated with lower topographic position on the site. Conclusions Our results suggest that French Island provides suitable habitat for the establishment of a population of eastern barred bandicoots. On French Island, toxoplasmosis was identified as an important source of mortality in addition to cat predation, and warrants further investigation. Implications Given the costs and challenges of predator control and the maintenance of predator exclusion fences, assisted colonisation to one or more fox-free islands remains the most viable option to establish self-sustaining bandicoot populations. Our results highlight the value in conducting trial releases ahead of major translocations.

Thermoregulatory, metabolic and ventilatory parameters measured for the Tasmanian eastern barred bandicoot (Perameles gunnii) in thermoneutrality (ambient temperature = 30°C) were: body temperature 35.1°C, basal metabolic rate 0.55 mL O2 g–1 h–1, wet thermal conductance 2.2 mL O2 g–1 h–1 °C–1, dry thermal conductance 1.4 J g–1 h–1 °C–1, ventilatory frequency 24.8 breaths min–1, tidal volume 9.9 mL, minute volume of 246 mL min–1, and oxygen extraction efficiency 22.2%. These physiological characteristics are consistent with a cool/wet distribution, e.g. high basal metabolic rate (3.33 mL O2 g–0.75 h–1) for thermogenesis, low thermal conductance (0.92 J g–1 h–1 °C–1 at 10°C) for heat retention and intolerance of high ambient temperatures (≥35°C) with panting, hyperthermia and high total evaporative water loss (16.9 mg H2O g–1 h–1).

We used live-trapping to study the demography and movement of two populations of the eastern barred bandicoot, Perameles gunnii, in south-eastern Tasmania from 1992 to 1996. Densities were 0.35–2.35 animals ha–1. Sex ratios were male-dominated on Grid I and female-dominated on Grid II. The average body weight for sexual maturity was 700g for males and 680g for females, while the lowest recorded weight for a breeding female was 570g. Perameles gunnii was sexually dimorphic, with males having a greater body weight and pes length than females. Recruitment was 25.4–32.1%, residence 46.7–100.0%, and emigration 16.5–25.5% of the population. Three juveniles were recruited to the Grid I population, 55 to Grid II, with a steady decline in the number of juveniles recruited to Grid II over the four years of the study. Breeding occurred year-round. Mean litter size was 2.53, with 78.2% of all litters having either 2 or 3 young. Mean longevity for male and female P. gunnii was 7.91 and 10.54 months, respectively. Home ranges of males (4.29 ha) were significantly larger than those of females (2.34 ha), although this may represent a significant underestimate due to the small width of our grids (200m) relative to the home-range area. There was only moderate overlap (19.3%) between home ranges of males and females. The overlap between male/male home ranges (4.4%) was significantly less than the overlap between female/female home ranges (15.8%). Perameles gunnii carried both ticks and fleas, with flea infestation being significantly higher on Grid I than on Grid II. Both populations underwent a significant decline over the study period, apparently the result of the unusually dry conditions over the first 3 years of the study. A deterioration in conditions was associated with a steady loss of resident adults, declining recruitment of juveniles and an increase in the male/female sex ratio. The sex ratio of P. gunnii populations may provide a convenient index of habitat quality, with poor or deteriorating conditions apparently associated with a high or increasing numbers of males to females.

Radio-tracking is a key technique for monitoring threatened species during ecological research and reintroduction programs. In the case of the endangered eastern barred bandicoot (Perameles gunnii), it has not been possible to radio-track for extended periods (≥3 months) due to difficulties in reliably and safely attaching radio-transmitters. In this study we compared eight attachment methods. Transmitters weighing 1.2–28 g were either mounted with adhesive, attached to a collar or implanted into the peritoneum. Intraperitoneal transmitters were superior in terms of attachment duration, but were considered inferior overall as they could not be fitted in the field and had a very short detection range once implanted (≤50 m). Retention times for external transmitters differed greatly between methods, ranging from 1 to 102 days. One tail-mount attachment technique caused minimal adverse effects but another caused tail amputation in one animal, and both had short retention times (3–33 days). Neither of the glue-on transmitter methods resulted in substantial periods of attachment (2–30 days) and flank-mounted transmitters also caused severe skin trauma. Radio-collars were generally retained for longer periods (42–102 days) but resulted in limb entanglement when they were fitted too loosely or subconjunctival haemorrhages when they were too tight. Cable tie collars are recommended as the most suitable attachment technique for bandicoots, as when fitted correctly they cause minimal impact to individuals and permit long retention times, but precise fitting is essential.

In the Midlands and on the east coast of Tasmania, the eastern barred bandicoot, Perameles gunnii, is restricted to a small number of isolated populations around townships. Comparable sites with similar habitat, rainfall, geology, soil type and topography were observed not to support P. gunnii. We examined four such paired sites around Tasmania, one site in each pair supporting P. gunnii, the other without P. gunnii. Using orthophotos and aerial photographs (scale 1: 5000), various features of the habitat were quantified for all site pairs, which were then compared. In the Midlands and north-west, sites with P. gunnii had significantly greater areas of ground cover, suitable as nests for P. gunnii and as refuges from predators, than did areas without P. gunnii. This association was not observed for the paired sites on the east coast. It is hypothesised that the remnant populations of P. gunnii found in the Midlands reflect the availability of pockets of suitable habitat, in particular the presence of significant ground cover for nesting sites and refugia. This has implications for management of P. gunnii in cleared agricultural land, where weed species may provide the principal cover for bandicoots.

Perameles gunnii is a small to medium-sized omnivorous marsupial. We measured milk components from Week 4 until weaning at Week 8; these showed marked quantitative and qualitative changes. The milk produced in the early stages of lactation was dilute, ~28% solid (w/w). At four weeks carbohydrate, protein and lipids were also at low levels: 2.0 g (100 mL)–1, 4.5 g (100 mL)–1 and 3.1 g (100 mL)–1 respectively. At the mid-phase of lactation solids reached 36%, carbohydrate 5.5 g (100 mL)–1, protein 10.0 g (100 mL)–1 and lipids 8.5 g (100 mL)–1. The energy content of the milk at 4 weeks of lactation was 2.25 kJ mL–1 while at pouch vacancy it reached 8.86 kJ mL–1. At 8 weeks the pouch young was almost weaned and all the constituents but carbohydrates had increased significantly. We compared the milk components of the eastern barred bandicoot with those of other marsupial species and with the Wombaroo milk formula used by zookeepers and carers to hand-raise orphaned bandicoots. We found the milk formula to be deficient in both protein and lipid.

The value of road-kill counts in monitoring changes in numbers of the eastern barred bandicoot, Perameles gunnii, was investigated in the Huon Valley, south-eastern Tasmania, by comparing population trends on two trapping grids with trends in road-kills on adjacent segments of highway. Between 1992 and 1996, both the number of P. gunnii on the trapping grids and the number of road-kills on the adjacent highway underwent a significant decline. While our data are preliminary, we suggest that road-kills may provide a useful index of gross, long-term trends in numbers of P. gunni. Such an index could be used to track long-term trends in local populations adjacent to a segment of highway, as in the present study. Alternatively, by considering a highway as a continuous ‘chain’ of such segments, road-kills may provide an index of trends over a larger (i.e. regional) scale.

We investigated the metabolic rate, thermoneutral zone and thermal conductance of the eastern barred bandicoot in Tasmania. Five adult eastern barred bandicoots (two males, three non-reproductive females) were tested at temperatures of 3, 10, 15, 20, 25, 30, 35 and 40°C. The thermoneutral zone was calculated from oxygen consumption and body temperature, measured during the daytime: their normal resting phase. It was found that the thermoneutral zone lies between 25°C and 30°C, with a minimum metabolic rate of 0.51 mL g–1 h–1 and body temperature of 35.8°C. At cooler ambient temperatures (3–20°C) the body temperature decreased to approximately 34.0°C while the metabolic rate increased from 0.7 to 1.3 mL g–1�h–1. At high temperatures (35°C and 40°C) both body temperature (36.9–38.7°C) and metabolic rate (1.0–1.5 mL g–1 h–1) rose. Thermal conductance was low below an ambient temperature of 30°C but increased significantly at higher temperatures. The low thermal conductance (due, in part, to good insulation, a reduced body temperature at lower ambient temperatures, combined with a relatively high metabolic rate) suggests that this species is well adapted to cooler environments but it could not thermoregulate easily at temperatures above 30°C.

The Eastern Barred Bandicoot, Perameles gunnii, is still relatively widespread and abundant in Tasmania, in contrast to the situation on mainland Australia where the species has declined to a single wild population. However, despite its relative security in Tasmania, there is evidence that a significant shift in the species' distribution has occurred since European settlement. The original range of P. gunnii in Tasmania can be postulated from the pre-European distribution of its original habitat (native grasslands and grassy woodlands), which occurred almost exclusively through the Midlands region of the state. We present anecdotal data collected from residents throughout the Midlands and adjoining regions which indicate that P. gunnii is now absent from the majority of its original range. The removal of >80% of the original Midlands native vegetation through clearing for agriculture and stock-grazing is suggested as the principal cause of this decline.

Body condition and diet of eastern barred bandicoots (Perameles gunnii) in southern Tasmania were quantified to investigate lactational strategies of a marsupial with medium-duration lactation and high reproductive output. There was no significant seasonal change in body condition, assessed using isotope dilution, or weight for either females or males. Further, body condition and weight of lactating females did not change with age of the pouch young, suggesting that female P. gunnii are able to cope with the energy demands of lactation without storing and utilising stored body fat. Analysis of faecal samples from April to October 1992 revealed a change of the frequency of occurrence of some prey items.

Context Reintroduction is a popular tool for conserving endangered species, yet many attempts fail. Soft-release measures, including acclimatisation, have been used for many species around the world, based on the reasoning that gradual and supported reintroductions should improve the success of animals released into an unfamiliar wild environment. However, experimental testing of soft-release methods is rare. Aims To experimentally test the effect of a soft-release method versus a hard-release method on the initial reintroduction success of the eastern barred bandicoot (Perameles gunnii). Methods We released 12 captive-bred eastern barred bandicoots into a predator-proof reserve using two methods: soft-release (7 days of on-site acclimatisation with supplementary food before release) and hard-release (no acclimatisation and no supplementary food). We monitored the bandicoots intensively via radio-tracking and live-trapping for 4 weeks after release. Compared with hard-release bandicoots, we predicted that soft-release bandicoots would have (1) reduced movement (first night dispersal, site fidelity and activity range), (2) more directed patterns of habitat selection, (3) improved bodyweights and (4) improved survival. Key results There was no detectable difference in habitat selection, overall weight change and survival between the soft-release and hard-release groups. There was moderate evidence that, compared with the hard-release group, soft-release bandicoots moved less, demonstrated lower individual variation in all measures of movement, and lost weight more gradually after release. In most cases, effect sizes were moderate to large but had large standard errors owing to both small sample size and high variance. Consequently, statistical testing failed to detect significant differences at the 5% level. Conclusions Despite evidence that the release method influenced some of the monitored behaviours, soft-release did not confer a consistent and substantive advantage for captive-bred eastern barred bandicoots at our site. We conclude that soft-release is unlikely to improve overall reintroduction success for this species at fenced predator-free sites. Implications The present study suggests that the preferred option for reintroductions of eastern barred bandicoots to fenced sites is a hard-release, information that is now being used to guide reintroductions of this species. Similar experiments should be undertaken to improve reintroduction practice for other endangered species.

The southern brown bandicoot (Isoodon obesulus) occurs across the periphery of southern and eastern Australia as a series of isolated regional populations. Historical records and recent surveys conducted for I. obesulus indicate that it has disappeared or decreased significantly from many parts of its former range. Vegetation clearance, habitat fragmentation, feral predators and fire have all been implicated in the decline of the species. This paper examines the distribution of I. obesulus in the Portland region of south-western Victoria. Historical records of I. obesulus were compiled from the specimen collection of Museum Victoria, the Atlas of Victorian Wildlife, Portland Field Naturalists’ Club records and anecdotal sources. Field surveys were conducted to determine the current distribution of I. obesulus in the study area based on evidence of its foraging activity. The historical records reveal limited information: most are clustered around centres of human activity, indicating observational bias. The field surveys demonstrate that I. obesulus occurs in the Portland region as a series of local populations. Each local population is associated with a patch of remnant native vegetation separated from neighbouring patches by dispersal barriers. Within these habitat remnants the occurrence of the species is sporadic. Approximately 69% of the potential habitat is managed by the Forests Service, 31% is managed by Parks Victoria, and less than 0.5% is held under other tenures. Spatial isolation of habitat remnants, fires and feral predators are the main threats to I. obesulus in the Portland region.

This article summarises current knowledge of marsupial population genetics, and discusses its relevance to the conservation of marsupial species. It has been suggested that there is much lower genetic variation within marsupial populations than in eutherian mammals. This trend is not evident in the electrophoretic data summarised here. However, genetic differentiation between populations, subspecies, and species of marsupials appears to be slightly lower than comparable values for eutherians. Genetic estimates of migration between populations are scarce at present, but show values that are comparable with eutherians. Some studies of marsupial population genetics have used non-electrophoretic characteristics, or have addressed the possibility of selection on the characters analysed. Although few, these studies indicate the suitability of marsupials for such investigations. Recent debate over the theories and applications of conservation genetics has made it clear that more research is required on individual species. Given the record of extinction of marsupials in the last 200 years, it is important to test the applicability of these theories to individual marsupial species. Several examples are discussed emphasising the need for ecological studies that estimate the effective number of reproducing individuals per generation. This figure, called the effective size, is the corner- stone of conservation genetics theory, being an important determinant of both the rate of loss of variation between individuals, and the rate of inbreeding. The effective size of the mainland population of the eastern barred bandicoot, Perameles gunnii, appears to be only about one-tenth of its census number. This result is comparable with estimates made in other vertebrates, and demonstrates that many marsupial species which appear to have an adequate census size on ecological grounds may face genetic problems resulting from small effective size.

Abstract ContextFire management advice for fauna conservation in protected areas must often be based on expert opinion and extrapolation from very few scientific studies. More monitoring and research are needed to better inform land managers tasked with both managing for biodiversity and managing the threat of bushfires. AimsTo document changes in the activity of native and introduced mammal species in response to planned burns in a small, isolated woodland reserve in Tasmania. MethodsOver a 10-year period, mammal activity was monitored before and after two separate moderate-intensity planned burns in 20-ha management blocks and in unburnt blocks of similar size by using live-trapping and camera-trapping. Vegetation density was monitored concurrently, and we also searched burnt areas for animals killed by fire. Key resultsThe activity of most mammal populations was largely unaffected by the two planned burns. However, during one of the burns, over 20 rufous-bellied pademelons were directly killed as a result of a need to conduct a backburn. The population recovered after 3 years. The activity of red-necked wallabies, common brushtail possums and short-beaked echidnas generally increased across the whole study area during the 10-year monitoring period. Limited evidence suggests that eastern barred bandicoot and European rabbit activity increased after fire. No swamp rat activity was recorded in burnt areas following the planned burns. Unexpectedly they did not recolonise burnt areas and also ceased to be active in control areas for the last 3 years of the study; we hypothesise that this may be due to the increased dryness and thinning of vegetation. ConclusionsWe found that most of the mammal populations within this small, isolated reserve were resilient to the planned burning program, with no or limited short-term effect for all but one species. The absence of swamp rats from burnt or unburnt areas for the last 3 years of our study suggests that factors other than fire are also affecting this species. ImplicationsPlanned burning is an important tool for biodiversity conservation, but its use needs to be underpinned by empirical data because mammal fire responses are likely to be site-, time- and context-specific.

IntroductionRegional identity is a constant construction, in which landscape, human activity and cultural imaginary build a narrative of place. For the Tasmanian Midlands, the interactions between history, ecology and agriculture both define place and present problems in how to recognise, communicate and balance these interactions. In this sense, regionality is defined not so much as a relation of margin to centre, but as a specific accretion of environmental and cultural histories. According weight to more-than-human perspectives, a region can be seen as a constellation of plant, animal and human interactions and demands, where creative art and design can make space and give voice to the dynamics of exchange between the landscape and its inhabitants. Consideration of three recent art and design projects based in the Midlands reveal the potential for cross-disciplinary research, embedded in both environment and community, to create distinctive and specific forms of connectivity that articulate a regional identify.The Tasmanian Midlands have been identified as a biodiversity hotspot (Australian Government), with a long history of Aboriginal cultural management disrupted by colonial invasion. Recent archaeological work in the Midlands, including the Kerry Lodge Archaeology and Art Project, has focused on the use of convict labour during the nineteenth century in opening up the Midlands for settler agriculture and transport. Now, the Midlands are placed under increasing pressure by changing agricultural practices such as large-scale irrigation. At the same time as this intensification of agricultural activity, significant progress has been made in protecting, preserving and restoring endemic ecologies. This progress has come through non-government conservation organisations, especially Greening Australia and their program Tasmanian Island Ark, and private landowners placing land under conservation covenants. These pressures and conservation activities give rise to research opportunities in the biological sciences, but also pose challenges in communicating the value of conservation and research outcomes to a wider public. The Species Hotel project, beginning in 2016, engaged with the aims of restoration ecology through speculative design while The Marathon Project, a multi-year curatorial art project based on a single property that contains both conservation and commercially farmed zones.This article questions the role of regionality in these three interconnected projects—Kerry Lodge, Species Hotel, and Marathon—sited in the Tasmanian Midlands: the three projects share a concern with the specificities of the region through engagement with specifics sites and their histories and ecologies, while also acknowledging the forces that shape these sites as far more mobile and global in scope. It also considers the interdisciplinary nature of these projects, in the crossover of art and design with ecological, archaeological and agricultural practices of measuring and intervening in the land, where communication and interpretation may be in tension with functionality. These projects suggest ways of working that connect the ecological and the cultural spheres; importantly, they see rural locations as sites of knowledge production; they test the value of small-scale and ephemeral interventions to explore the place of art and design as intervention within colonised landscape.Regions are also defined by overlapping circles of control, interest, and authority. We test the claim that these projects, which operate through cross-disciplinary collaboration and network with a range of stakeholders and community groups, successfully benefit the region in which they are placed. We are particularly interested in the challenges of working across institutions which both claim and enact connections to the region without being centred there. These projects are initiatives resulting from, or in collaboration with, University of Tasmania, an institution that has taken a recent turn towards explicitly identifying as place-based yet the placement of the Midlands as the gap between campuses risks attenuating the institution’s claim to be of this place. Paul Carter, in his discussion of a regional, site-specific collaboration in Alice Springs, flags how processes of creative place-making—operating through mythopoetic and story-based strategies—requires a concrete rather than imagined community that actively engages a plurality of voices on the ground. We identify similar concerns in these art and design projects and argue that iterative and long-term creative projects enable a deeper grappling with the complexities of shared regional place-making. The Midlands is aptly named: as a region, it is defined by its geographical constraints and relationships to urban centres. Heading south from the northern city of Launceston, travellers on the Midland Highway see scores of farming properties networking continuously for around 175 kilometres south to the outskirts of Brighton, the last major township before the Tasmanian capital city of Hobart. The town of Ross straddles latitude 42 degrees south—a line that has historically divided Tasmania into the divisions of North and South. The region is characterised by extensive agricultural usage and small remnant patches of relatively open dry sclerophyll forest and lowland grassland enabled by its lower attitude and relatively flatter terrain. The Midlands sit between the mountainous central highlands of the Great Western Tiers and the Eastern Tiers, a continuous range of dolerite hills lying south of Ben Lomond that slope coastward to the Tasman Sea. This area stretches far beyond the view of the main highway, reaching east in the Deddington and Fingal valleys. Campbell Town is the primary stopping point for travellers, superseding the bypassed towns, which have faced problems with lowering population and resulting loss of facilities.Image 1: Southern Midland Landscape, Ross, Tasmania, 2018. Image Credit: Patrick Sutczak.Predominantly under private ownership, the Tasmanian Midlands are a contested and fractured landscape existing in a state of ecological tension that has occurred with the dominance of western agriculture. For over 200 years, farmers have continually shaped the land and carved it up into small fragments for different agricultural agendas, and this has resulted in significant endemic species decline (Mitchell et al.). The open vegetation was the product of cultural management of land by Tasmanian Aboriginal communities (Gammage), attractive to settlers during their distribution of land grants prior to the 1830s and a focus for settler violence. As documented cartographically in the Centre for 21st Century Humanities’ Colonial Frontier Massacres in Central and Eastern Australia 1788–1930, the period 1820–1835, and particularly during the Black War, saw the Midlands as central to the violent dispossession of Aboriginal landowners. Clements argues that the culture of violence during this period also reflected the brutalisation that the penal system imposed upon its subjects. The cultivation of agricultural land throughout the Midlands was enabled by the provision of unfree convict labour (Dillon). Many of the properties granted and established during the colonial period have been held in multi-generational family ownership through to the present.Within this patchwork of private ownership, the tension between visibility and privacy of the Midlands pastures and farmlands challenges the capacity for people to understand what role the Midlands plays in the greater Tasmanian ecology. Although half of Tasmania’s land areas are protected as national parks and reserves, the Midlands remains largely unprotected due to private ownership. When measured against Tasmania’s wilderness values and reputation, the dry pasturelands of the Midland region fail to capture an equivalent level of visual and experiential imagination. Jamie Kirkpatrick describes misconceptions of the Midlands when he writes of “[f]latness, dead and dying eucalypts, gorse, brown pastures, salt—environmental devastation […]—these are the common impression of those who first travel between Spring Hill and Launceston on the Midland Highway” (45). However, Kirkpatrick also emphasises the unique intimate and intricate qualities of this landscape, and its underlying resilience. In the face of the loss of paddock trees and remnants to irrigation, change in species due to pasture enrichment and introduction of new plant species, conservation initiatives that not only protect but also restore habitat are vital. The Tasmanian Midlands, then, are pastoral landscapes whose seeming monotonous continuity glosses over the radical changes experienced in the processes of colonisation and intensification of agriculture.Underlying the Present: Archaeology and Landscape in the Kerry Lodge ProjectThe major marker of the Midlands is the highway that bisects it. Running from Hobart to Launceston, the construction of a “great macadamised highway” (Department of Main Roads 10) between 1820–1850, and its ongoing maintenance, was a significant colonial project. The macadam technique, a nineteenth century innovation in road building which involved the laying of small pieces of stone to create a surface that was relatively water and frost resistant, required considerable but unskilled labour. The construction of the bridge at Kerry Lodge, in 1834–35, was simultaneous with significant bridge buildings at other major water crossings on the highway, (Department of Main Roads 16) and, as the first water crossing south of Launceston, was a pinch-point through which travel of prisoners could be monitored and controlled. Following the completion of the bridge, the site was used to house up to 60 male convicts in a road gang undergoing secondary punishment (1835–44) and then in a labour camp and hiring depot until 1847. At the time of the La Trobe report (1847), the buildings were noted as being in bad condition (Brand 142–43). After the station was disbanded, the use of the buildings reverted to the landowners for use in accommodation and agricultural storage.Archaeological research at Kerry Lodge, directed by Eleanor Casella, investigated the spatial and disciplinary structures of smaller probation and hiring depots and the living and working conditions of supervisory staff. Across three seasons (2015, 2016, 2018), the emerging themes of discipline and control and as well as labour were borne out by excavations across the site, focusing on remnants of buildings close to the bridge. This first season also piloted the co-presence of a curatorial art project, which grew across the season to include eleven practitioners in visual art, theatre and poetry, and three exhibition outcomes. As a crucial process for the curatorial art project, creative practitioners spent time on site as participants and observers, which enabled the development of responses that interrogated the research processes of archaeological fieldwork as well as making connections to the wider historical and cultural context of the site. Immersed in the mundane tasks of archaeological fieldwork, the practitioners involved became simultaneously focused on repetitive actions while contemplating the deep time contained within earth. This experience then informed the development of creative works interrogating embodied processes as a language of site.The outcome from the first fieldwork season was earthspoke, an exhibition shown at Sawtooth, an artist-run initiative in Launceston in 2015, and later re-installed in Franklin House, a National Trust property in the southern suburbs of Launceston.Images 2 and 3: earthspoke, 2015, Installation View at Sawtooth ARI (top) and Franklin House (bottom). Image Credits: Melanie de Ruyter.This recontextualisation of the work, from contemporary ARI (artist run initiative) gallery to National Trust property enabled the project to reach different audiences but also raised questions about the emphases that these exhibition contexts placed on the work. Within the white cube space of the contemporary gallery, connections to site became more abstracted while the educational and heritage functions of the National Trust property added further context and unintended connotations to the art works.Image 4: Strata, 2017, Installation View. Image Credit: Karen Hall.The two subsequent exhibitions, Lines of Site (2016) and Strata (2017), continued to test the relationship between site and gallery, through works that rematerialised the absences on site and connected embodied experiences of convict and archaeological labour. The most recent iteration of the project, Strata, part of the Ten Days on the Island art festival in 2017, involved installing works at the site, marking with their presence the traces, fragments and voids that had been reburied when the landscape returned to agricultural use following the excavations. Here, the interpretive function of the works directly addressed the layered histories of the landscape and underscored the scope of the human interventions and changes over time within the pastoral landscape. The interpretative role of the artworks formed part of a wider, multidisciplinary approach to research and communication within the project. University of Manchester archaeology staff and postgraduate students directed the excavations, using volunteers from the Launceston Historical Society. Staff from Launceston’s Queen Victorian Museum and Art Gallery brought their archival and collection-based expertise to the site rather than simply receiving stored finds as a repository, supporting immediate interpretation and contextualisation of objects. In 2018, participation from the University of Tasmania School of Education enabled a larger number of on-site educational activities than afforded by previous open days. These multi-disciplinary and multi-organisational networks, drawn together provisionally in a shared time and place, provided rich opportunities for dialogue. However, the challenges of sustaining these exchanges have meant ongoing collaborations have become more sporadic, reflecting different institutional priorities and competing demands on participants. Even within long-term projects, continued engagement with stakeholders can be a challenge: while enabling an emerging and concrete sense of community, the time span gives greater vulnerability to external pressures. Making Home: Ecological Restoration and Community Engagement in the Species Hotel ProjectImages 5 and 6: Selected Species Hotels, Ross, Tasmania, 2018. Image Credits: Patrick Sutczak. The Species Hotels stand sentinel over a river of saplings, providing shelter for animal communities within close range of a small town. At the township of Ross in the Southern Midlands, work was initiated by restoration ecologists to address the lack of substantial animal shelter belts on a number of major properties in the area. The Tasmania Island Ark is a major Greening Australia restoration ecology initiative, connecting 6000 hectares of habitat across the Midlands. Linking larger forest areas in the Eastern Tiers and Central Highlands as well as isolated patches of remnant native vegetation, the Ark project is vital to the ongoing survival of local plant and animal species under pressure from human interventions and climate change. With fragmentation of bush and native grasslands in the Midland landscape resulting in vast open plains, the ability for animals to adapt to pasturelands without shelter has resulted in significant decline as animals such as the critically endangered Eastern Barred Bandicoot struggle to feed, move, and avoid predators (Cranney). In 2014 mass plantings of native vegetation were undertaken along 16km of the serpentine Macquarie River as part of two habitat corridors designed to bring connectivity back to the region. While the plantings were being established a public art project was conceived that would merge design with practical application to assist animals in the area, and draw community and public attention to the work that was being done in re-establishing native forests. The Species Hotel project, which began in 2016, emerged from a collaboration between Greening Australia and the University of Tasmania’s School of Architecture and Design, the School of Land and Food, the Tasmanian College of the Arts and the ARC Centre for Forest Value, with funding from the Ian Potter Foundation. The initial focus of the project was the development of interventions in the landscape that could address the specific habitat needs of the insect, small mammal, and bird species that are under threat. First-year Architecture students were invited to design a series of structures with the brief that they would act as ‘Species Hotels’, and once created would be installed among the plantings as structures that could be inhabited or act as protection. After installation, the privately-owned land would be reconfigured so to allow public access and observation of the hotels, by residents and visitors alike. Early in the project’s development, a concern was raised during a Ross community communication and consultation event that the surrounding landscape and its vistas would be dramatically altered with the re-introduced forest. While momentary and resolved, a subtle yet obvious tension surfaced that questioned the re-writing of an established community’s visual landscape literacy by non-residents. Compact and picturesque, the architectural, historical and cultural qualities of Ross and its location were not only admired by residents, but established a regional identity. During the six-week intensive project, the community reach was expanded beyond the institution and involved over 100 people including landowners, artists, scientists and school children from the region (Wright), attempting to address and channel the concerns of residents about the changing landscape. The multiple timescales of this iterative project—from intensive moments of collaboration between stakeholders to the more-than-human time of tree growth—open spaces for regional identity to shift as both as place and community. Part of the design brief was the use of fully biodegradable materials: the Species Hotels are not expected to last forever. The actual installation of the Species Hotelson site took longer than planned due to weather conditions, but once on site they were weathering in, showing signs of insect and bird habitation. This animal activity created an opportunity for ongoing engagement. Further activities generated from the initial iteration of Species Hotel were the Species Hotel Day in 2017, held at the Ross Community Hall where presentations by scientists and designers provided feedback to the local community and presented opportunities for further design engagement in the production of ephemeral ‘species seed pies’ placed out in and around Ross. Architecture and Design students have gone on to develop more examples of ‘ecological furniture’ with a current focus on insect housing as well as extrapolating from the installation of the Species Hotels to generate a VR visualisation of the surrounding landscape, game design and participatory movement work that was presented as part of the Junction Arts Festival program in Launceston, 2017. The intersections of technologies and activities amplified the lived in and living qualities of the Species Hotels, not only adding to the connectivity of social and environmental actions on site and beyond, but also making a statement about the shared ownership this project enabled.Working Property: Collaboration and Dialogues in The Marathon Project The potential of iterative projects that engage with environmental concerns amid questions of access, stewardship and dialogue is also demonstrated in The Marathon Project, a collaborative art project that took place between 2015 and 2017. Situated in the Northern Midland region of Deddington alongside the banks of the Nile River the property of Marathon became the focal point for a small group of artists, ecologists and theorists to converge and engage with a pastoral landscape over time that was unfamiliar to many of them. Through a series of weekend camps and day trips, the participants were able to explore and follow their own creative and investigative agendas. The project was conceived by the landowners who share a passion for the history of the area, their land, and ideas of custodianship and ecological responsibility. The intentions of the project initially were to inspire creative work alongside access, engagement and dialogue about land, agriculture and Deddington itself. As a very small town on the Northern Midland fringe, Deddington is located toward the Eastern Tiers at the foothills of the Ben Lomond mountain ranges. Historically, Deddington is best known as the location of renowned 19th century landscape painter John Glover’s residence, Patterdale. After Glover’s death in 1849, the property steadily fell into disrepair and a recent private restoration effort of the home, studio and grounds has seen renewed interest in the cultural significance of the region. With that in mind, and with Marathon a neighbouring property, participants in the project were able to experience the area and research its past and present as a part of a network of working properties, but also encouraging conversation around the region as a contested and documented place of settlement and subsequent violence toward the Aboriginal people. Marathon is a working property, yet also a vital and fragile ecosystem. Marathon consists of 1430 hectares, of which around 300 lowland hectares are currently used for sheep grazing. The paddocks retain their productivity, function and potential to return to native grassland, while thickets of gorse are plentiful, an example of an invasive species difficult to control. The rest of the property comprises eucalypt woodlands and native grasslands that have been protected under a conservation covenant by the landowners since 2003. The Marathon creek and the Nile River mark the boundary between the functional paddocks and the uncultivated hills and are actively managed in the interface between native and introduced species of flora and fauna. This covenant aimed to preserve these landscapes, linking in with a wider pattern of organisations and landowners attempting to address significant ecological degradation and isolation of remnant bushland patches through restoration ecology. Measured against the visibility of Tasmania’s wilderness identity on the national and global stage, many of the ecological concerns affecting the Midlands go largely unnoticed. The Marathon Project was as much a project about visibility and communication as it was about art and landscape. Over the three years and with its 17 participants, The Marathon Project yielded three major exhibitions along with numerous public presentations and research outputs. The length of the project and the autonomy and perspectives of its participants allowed for connections to be formed, conversations initiated, and greater exposure to the productivity and sustainability complexities playing out on rural Midland properties. Like Kerry Lodge, the 2015 first year exhibition took place at Sawtooth ARI. The exhibition was a testing ground for artists, and a platform for audiences, to witness the cross-disciplinary outputs of work inspired by a single sheep grazing farm. The interest generated led to the rethinking of the 2016 exhibition and the need to broaden the scope of what the landowners and participants were trying to achieve. Image 7: Panel Discussion at Open Weekend, 2016. Image Credit: Ron Malor.In November 2016, The Marathon Project hosted an Open Weekend on the property encouraging audiences to visit, meet the artists, the landowners, and other invited guests from a number of restoration, conservation, and rehabilitation organisations. Titled Encounter, the event and accompanying exhibition displayed in the shearing shed, provided an opportunity for a rhizomatic effect with the public which was designed to inform and disseminate historical and contemporary perspectives of land and agriculture, access, ownership, visitation and interpretation. Concluding with a final exhibition in 2017 at the University of Tasmania’s Academy Gallery, The Marathon Project had built enough momentum to shape and inform the practice of its participants, the knowledge and imagination of the public who engaged with it, and make visible the precarity of the cultural and rural Midland identity.Image 8. Installation View of The Marathon Project Exhibition, 2017. Image Credit: Patrick Sutczak.ConclusionThe Marathon Project, Species Hotel and the Kerry Lodge Archaeology and Art Project all demonstrate the potential of site-based projects to articulate and address concerns that arise from the environmental and cultural conditions and histories of a region. Beyond the Midland fence line is a complex environment that needed to be experienced to be understood. Returning creative work to site, and opening up these intensified experiences of place to a public forms a key stage in all these projects. Beyond a commitment to site-specific practice and valuing the affective and didactic potential of on-site installation, these returns grapple with issues of access, visibility and absence that characterise the Midlands. Paul Carter describes his role in the convening of a “concretely self-realising creative community” in an initiative to construct a meeting-place in Alice Springs, a community defined and united in “its capacity to imagine change as a negotiation between past, present and future” (17). Within that regional context, storytelling, as an encounter between histories and cultures, became crucial in assembling a community that could in turn materialise story into place. In these Midlands projects, a looser assembly of participants with shared interests seek to engage with the intersections of plant, human and animal activities that constitute and negotiate the changing environment. The projects enabled moments of connection, of access, and of intervention: always informed by the complexities of belonging within regional locations.These projects also suggest the need to recognise the granularity of regionalism: the need to be attentive to the relations of site to bioregion, of private land to small town to regional centre. The numerous partnerships that allow such interconnect projects to flourish can be seen as a strength of regional areas, where proximity and scale can draw together sets of related institutions, organisations and individuals. However, the tensions and gaps within these projects reveal differing priorities, senses of ownership and even regional belonging. Questions of who will live with these project outcomes, who will access them, and on what terms, reveal inequalities of power. Negotiations of this uneven and uneasy terrain require a more nuanced account of projects that do not rely on the geographical labelling of regions to paper over the complexities and fractures within the social environment.These projects also share a commitment to the intersection of the social and natural environment. They recognise the inextricable entanglement of human and more than human agencies in shaping the landscape, and material consequences of colonialism and agricultural intensification. Through iteration and duration, the projects mobilise processes that are responsive and reflective while being anchored to the materiality of site. Warwick Mules suggests that “regions are a mixture of data and earth, historically made through the accumulation and condensation of material and informational configurations”. Cross-disciplinary exchanges enable all three projects to actively participate in data production, not interpretation or illustration afterwards. Mules’ call for ‘accumulation’ and ‘configuration’ as productive regional modes speaks directly to the practice-led methodologies employed by these projects. The Kerry Lodge and Marathon projects collect, arrange and transform material taken from each site to provisionally construct a regional material language, extended further in the dual presentation of the projects as off-site exhibitions and as interventions returning to site. The Species Hotel project shares that dual identity, where materials are chosen for their ability over time, habitation and decay to become incorporated into the site yet, through other iterations of the project, become digital presences that nonetheless invite an embodied engagement.These projects centre the Midlands as fertile ground for the production of knowledge and experiences that are distinctive and place-based, arising from the unique qualities of this place, its history and its ongoing challenges. Art and design practice enables connectivity to plant, animal and human communities, utilising cross-disciplinary collaborations to bring together further accumulations of the region’s intertwined cultural and ecological landscape.ReferencesAustralian Government Department of the Environment and Energy. Biodiversity Conservation. Canberra: Commonwealth of Australia, 2018. 1 Apr. 2019 <http://www.environment.gov.au/biodiversity/conservation>.Brand, Ian. The Convict Probation System: Van Diemen’s Land 1839–1854. Sandy Bay: Blubber Head Press, 1990.Carter, Paul. “Common Patterns: Narratives of ‘Mere Coincidence’ and the Production of Regions.” Creative Communities: Regional Inclusion & the Arts. Eds. Janet McDonald and Robert Mason. Bristol: Intellect, 2015. 13–30.Centre for 21st Century Humanities. Colonial Frontier Massacres in Central and Eastern Australia 1788–1930. 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