Options
Vernes, Karl
- PublicationMycophagy in the larger bodied skinks of the genera 'Tiliqua' and 'Egernia': are there implications for ecosystem health?The larger bodied skink of the genera 'Tikiqua' (blue-tongued and shingle-back lizards) and 'Egernia' may be contributing to the maintenance of ecosystem health by dispersing fungle spores that form symbiotic relationships with most terrestrial plant species. We observed an Eastern Blue-tongued Lizard 'Tiliqua scincoides' digging for fungi in a garden bed, which prompted us to examine the literature on the consumption of fungi by skinks. Our observation, together with a previous record of 'Tiliqua nigrolutea' having consumed the fruiting bodies of truffle-like fungi (Webb and Simpson 1985), indicates that blue-tongued lizards can detect the presence of subterranean fungi and will readily eat them.
- PublicationRepresenting the Dingo: An Examination of Dingo-Human Encounters in Australian Cultural and Environmental Heritage(2017)
;Philip, Justine Mary ;Reid, Nick ;Garden, Don; The aim of my thesis is to document the cultural history and heritage of the ancient Australian canine, the dingo. An analysis of the complex symbiotic relationship between the dingo and human society for over 4,600 years reveals an animal uniquely positioned as both a human companion and top-order predator - fulfilling important ecosystem services across the Australian mainland, complementary to their role in traditional Aboriginal society. The thesis collates ethnographic, scientific and social representations of the dingo, and interrogates the legacy of 200 years of dingo control across the south-eastern third of the continent. I use a writing technique called a prosopography to explore areas of knowledge about dingoes, and the culture and heritage surrounding them. This involves recording human-animal encounters in the form of the stories of individual animals within a contextual history, revealing themes, patterns, inconsistencies and anomalies in dingo-human history. The listing of the species as endangered on the IUCN Red List (2004) and as a threatened species in the State of Victoria (2008) underscores the importance of critical analysis, revealing processes underlying the construction and dissemination of dingo knowledge that reinforce their cultural and physical marginalization. The study reveals a complex human-dingo history, and strives to present this information in a comprehensible format as a basis for discussion - allowing new insights into the unique history of the dingo's survival at the heart of traditional Aboriginal society and at the limits and borderlands of contemporary environmental management. - PublicationTruffle consumption by New Guinea forest wallabiesAlthough the fungal diet of Australian mammals, including macropodids (kangaroos and wallabies), is reasonably well understood, no work has been done on mycophagy among New Guinea mammals. We examined stomach samples from the black forest wallaby, 'Dorcopsis atrata' (one sample), greater forest wallaby, 'Dorcopsis hageni' (two samples), lesser forest wallaby, 'Dorcopsulus vanheurni' (five samples), and the dusky pademelon, 'Thylogale brunii' (one sample), for the presence of spores of epigeous (mushroom-like) and hypogeous (truffle-like) macrofungi. All wallaby species were found to have consumed a range of fungal taxa as part of their diet, including those taxa that form symbiotic relationships with forest trees and produce truffle-like fruit-bodies. This is the first record of truffle consumption of fungi by mammals in New Guinea. Our work suggests that forest wallabies are important dispersers of fungi, and may play a significant role in maintaining mycorrhizal communities and healthy forest ecosystems in New Guinea.
- PublicationDog and Cat Interactions in a Remote Aboriginal Community(MDPI AG, 2018)
; ; ; ; Australian remote Aboriginal communities commonly have large, free-roaming dog populations and relatively small cat populations. However, cats are becoming increasingly popular pets in these communities and it is essential to determine their potential impacts on wildlife to inform animal management practices. In a small island community, this study provided baseline population demographics and investigated dog and cat roaming behaviours and interspecific interactions. The dog population, estimated at 343 dogs, showed active periods at dawn and dusk. The cat population had doubled in 6 months to approximately 83 cats. Cats were observed roaming mainly from dawn until dusk, possibly avoiding periods when dogs were most active. The majority of cats were observed nonroaming. Three cats, however, were captured roaming during the night when all flightless wildlife were observed on our camera traps, suggesting potential impact on local wildlife through their hunting activities. These baseline data provide evidence on which to base management programs that include cats and their impacts on native wildlife. Further research using the multiple methods piloted in this study are warranted to monitor dog and cat populations and their interactions in this island community. - PublicationThe Ecology of the Bhutan takin Budorcas whitei in Jigme Dorji National Park, Bhutan(2019-02-11)
;Sangay, Tiger; The Bhutan takin Budorcas whitei, a large gregarious forest-dwelling ungulate, is endemic to Bhutan and categorized as 'vulnerable' by the IUCN Red List of Threatened Species. The word 'takin' is used hereafter to denote both singular and plural. Prior to my work, there had been only one study on this species which investigated its diet within its summer habitat. Prior to beginning my field research on takin, I assessed its current distribution and conservation status in Bhutan from information gathered through publications, field surveys, interviews and unpublished reports. The assessment resulted in documenting some interesting facts such as establishing the Bhutan takin as endemic to Bhutan; the takin's site fidelity to hot spring and salt lick areas, and their distribution along the river valleys which are important landscape features for habitat selection. I identified additional threats to the takin like anthropogenic disturbance and disruption to migration routes, threats posed by domestic livestock including dogs, and the risk of zoonoses disease transmission.
I examined takin migratory movement between their winter and summer habitat, and their summer habitat use in the Tsharijathang Valley of Jigme Dorji National Park, Bhutan, from 2013-2015 using GPS collars. Bhutan takins are seasonal migrants from warm broad-leaved forest to alpine meadow within the altitude range of 1500 m to 5550 m asl (meter above sea level, hereafter using 'm' instead of 'm asl'). GPS-collars were placed on 13 adult takins (7 males and 6 females) to document these seasonal movements. Because of animal welfare concerns, sub-adult animals could not be collared. Takin, on average, travelled about 4 km per 24-hour period, about a third of which occurred at night. There was high site fidelity and overlap of habitat in their summer range that led to short distance travel which ultimately resulted in a smaller summer home range. The Minimum Convex Polygon (MCP) home range estimate for takin in the summer habitat at a 95% isopleth ranged between 3.35 - 14.21 km2, while the kernel utilization distribution (KUD) estimate ranged between 7.55 to 27.4 km2. A male takin (TM2724) collared on 8 July 2013 provided partial data on takin migration from its summer range to its winter range before the GPS collar ran out of memory on 27 September 2013. However, this inaugural migration data showed that the animal travelled 26.68 km in the rugged mountainous terrain in three days, and part of which was along a ridgeline between 5007 to 5374 m. The male migrated to the area around Zomling, Lingzhi and Barshong, Naro of Thimphu district.
Habitat use by the Bhutan takin in their summer (alpine meadows) and winter (broadleaf forest) habitats was examined by comparing floristic composition in the areas that were used by takin compared to those that were not used. A collective total of 58 plots were laid in the summer habitat (30 plots, 15 each in the used and unused area) and in the winter habitat (28 plots, 14 each in the used and unused area). Principal component analysis (PCA) showed that the first three principal components explained about 70 percent of the total variance between used and unused sites. PC1 had significant loadings from variables like altitude, herb count and herb mean height, PC2's significant variables were tree count and tree mean DBH while PC3 had significant loadings from shrub mean height. Analysis of variance using distance matrices showed that there were significant differences between the used and unused plots in both habitats (summer F 1, 28 = 69.36, p < 0.01; winter F 1, 26 = 3.89, p < 0.01). The analysis of data from the summer habitat showed significant difference between used and unused plots that was driven by differences in plant species and diversity, with used plots having significantly more trees and shrubs which the takin prefers as cover and for rest during midday.
Local knowledge and perceptions by people towards the takin was assessed by conducting facetoface semi-structured interviews on 169 residents of Jigme Dorji National Park from the Laya Geog (takin summer habitat; 91 residents) and Khatey and Khamey Geogs (takin winter habitat; 78 residents). Most respondents knew the takin was the national animal and a significantly higher proportion also knew its protected status. There was a significant difference in knowledge based upon respondents' residence whereby residents in the takin's summer habitat possessed more knowledge on the vulnerable status of takin. The summer habitat has affluent residents that benefit from collection of the prized medicinal Chinese caterpillar fungus or 'Cordyceps' Ophiocordyceps sinensis; this in turn allows them better access to media (e.g. television and radio) that expose them to pertinent information and campaigns surrounding the takin. Most respondents expressed positive feelings towards the takin and supported its protection.
This strong positive attitude and awareness by residents is promising but it is strongly recommended that the park develops diverse education programs targeting different age groups and learning capabilities in continuing to maintain local support and stewardship. Conservation of the takin, however, is not without its challenges and requires a commitment to reduce anthropogenic disturbance such as land use change from road construction, infrastructure for power transmission lines, unregulated harvesting of natural resources notably the prized cordyceps, competition for foraging resources from domestic livestock, and most critically, the spread of zoonotic disease transmission from domestic livestock. Understanding habitat use by takin and associated preferred habitat variables amidst various anthropogenic threats is integral towards ameliorating damage to takin habitat and preventing further loss. Furthermore, the Jigme Dorji National Park management should reinforce the implementation of the tripartite Tsharijathang Agreement whereby domestic livestock are not grazed in the Tsharijathang Valley a month prior to the takin's arrival. The valley needs urgent protection as a declared takin sanctuary to provide a safe habitat for takin during their breeding season. This valley attracts different congregating herds from several wintering habitats around Thimphu, Paro, Gasa and Punakha, and it is crucial to facilitate the current genetic exchange to increase population vigor for the long-term survival of the takin, Bhutan's national animal.
- PublicationHuman–wildlife conflict in the Kingdom of Bhutan: Patterns of livestock predation by large mammalian carnivoresWe examined predation activity throughout Bhutan by tiger (Panthera tigris'), common leopard ('Panthera pardus'), snow leopard ('Uncia uncia) and Himalayan black bear ('Ursus thibetanus') on a variety of livestock types using data gathered over the first two years (2003–2005) of a compensation scheme for livestock losses. One thousand three hundred and seventy five kills were documented, with leopards killing significantly more livestock (70% of all kills), than tigers (19%), bears (8%) and snow leopards (2%). About 50% of livestock killing were of cattle, and about 33% were of horses, with tigers, leopards and snow leopards killing a significantly greater proportion of horses than predicted from availability. Examination of cattle kills showed that leopards killed a significantly greater proportion of smaller prey (e.g., calves), whereas tigers killed a significantly greater proportion of larger prey (e.g., bulls). Overall, livestock predation was greatest in summer and autumn which corresponded with a peak in cropping agriculture; livestock are turned out to pasture and forest during the cropping season, and subsequently, are less well guarded than at other times. Across Bhutan, high horse density and low cattle and yak density were associated with high rates of livestock attack, but no relationship was found with forest cover or human population density. Several northern districts were identified as 'predation hotspots', where proportions of livestock lost to predation were considerable, and the ratio of reported kills to relative abundance of livestock was high. Implications of our findings for mitigating livestock losses and for conserving large carnivores in Bhutan are discussed.
- PublicationReview and analysis of Australian macropod translocations 1969-2006(Wiley-Blackwell Publishing Ltd, 2014)
;Clayton, Jim ;Pavey, Chris R; 1. Translocations have become an increasingly popular tool in threatened macropod conservation in Australia. Although previous evaluations of Australian macropod translocations have been published, the number of contemporary translocation programmes awaiting analysis, and new data regarding historic translocations, required a new assessment of macropod translocation programmes. 2. We aimed to assess trends in the way macropod translocations were conducted during the period 1969-2006, determine the number of successful translocations and identify factors common to successful translocations. 3. Data regarding macropod translocations were obtained from a wide variety of sources, including peer-reviewed journals, 'grey' literature and popular interest publications. Questionnaires were also sent to translocation managers to acquire detailed information. Specific aspects of macropod translocation methodology were analysed, and classification tree analysis was conducted to identify methodological and environmental factors common to successful translocations. 4. We identified 109 macropod translocations for which sufficient data could be collected to permit analysis. Using the presence of a population on 1 January 2007 as a simple criterion, 61% of translocations were successful. Of these translocations, 66% were also considered successful by Short et al.'s criteria (population persisted for five years and is deemed likely to continue to persist); the remainder could not be assessed due to lack of data or insufficient elapsed time since release. Classification tree analysis suggested methodological and environmental factors common to successful translocations; the overriding factor determining success was the absence of cats and foxes at the release site. 5. Although Australian macropod translocation proponents are faced with myriad methodological options when designing a translocation protocol, the primary consideration should be whether or not cats or foxes are present at the release site. Managers should be aware that there may be no safe population level of such predators for some translocation candidate species. Ignoring this fact will inevitably lead to a repeat of past translocation failures. - PublicationEcological Impacts of Feral Horses in Grassy Woodland and Open-Forest Gorge Country in a Temperate-Subtropical Wilderness(2011)
;Lenehan, Joanne Rachel; ; In temperate southeastern Australian national parks, feral horses occupy a unique ecological niche as the largest bodied, most mobile ungulate grazer with a suite of flexible physiological, behavioural and morphological traits that have enabled them to thrive under a wide range of ecological conditions (Beever 2003 p. 282). As Australian plants and soils have not evolved in the presence of ungulate disturbance, there is concern that feral horses pose a risk to native habitats and wildlife. This thesis takes a multi-faceted approach to improve the understanding of the connections between feral horse grazing and trampling, successional changes in plant communities, ecosystem function and resilience, and the potential for horses to displace marsupial grazers as the dominant herbivore regulating primary production. - PublicationGrazing effects of Black Swans 'Cygnus atratus' (Latham) on a seasonally flooded coastal wetland of eastern AustraliaLittle is known about the effects of grazing by birds on seasonally flooded Australian wetlands. Grazing by Black Swans 'Cygnus atratus' (Latham) has an obvious visual impact in Little Broad water, an ecologically important wetland on the Clarence River floodplain on the east coast of Australia. We measured the impact of grazing by swans in this wetland from March to September 2007 by comparing the structure and biomass of marsh vegetation (emergent and submerged macrophytes) in sites from which swans had been excluded and sites to which they had access. In grazed sites, after 135 days, the mean above-sediment biomass of the dominant sedge 'Eleocharis equisetina' C. Presl was 52% less than in ungrazed sites. This difference was mostly because of the loss of leaf biomass above the waterline in grazed sites where biomass had been reduced by 99% compared with ungrazed sites. This created more habitat for other birds such as wading birds (e.g., Royal Spoonbills 'Platalea regia' Gould) and dabbling ducks (e.g., Grey Teal 'Anas gracilis' Buller). Where water levels can be artificially manipulated, local wetland managers could attempt to restore the flood pulse to wetlands that are large enough to sustain Black Swan populations to retain a variety of other waterbirds that require open water.
- PublicationA vertical bait station for black rats ('Rattus rattus') that reduces bait take by a sympatric native rodentNovel bait stations can be used as a targeted method of delivering bait by exploiting behavioural traits of the target species. On Muttonbird Island, New South Wales, the black rat ('Rattus rattus') has been baited to aid the conservation of the island's wedge-tailed shearwater ('Ardenna pacifica') colony, which may result in poisoning of the sympatric swamp rat ('Rattus lutreolus'). We aimed to design a bait station that 'R. rattus' could reach, but that 'R. lutreolus' could not. We found that 11 (92%) of 12 captive 'R. rattus' reached the bait chambers by climbing a 50-cm vertical pipe, whereas only four (18%) of 22 'R. lutreolus' reached these bait stations. In a field trial on Muttonbird Island 'R. rattus' entered the bait chamber on an average of 5.3 events per night of vertical bait station deployment, but 'R. lutreolus' did not enter the stations. In a field trial on the mainland at a site with a high density of 'R. lutreolus', this species was detected in one vertical bait station five times, equating to an average of 0.017 events per night of vertical bait station deployment. We conclude that 'R. rattus' readily climbs a 50-cm pipe to enter the bait station, whereas 'R. lutreolus' rarely or never does on Muttonbird Island or at the mainland site.