William Virgil Bleisch

Dr. William Virgil Bleisch

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Academic Career Length

18Years (2009-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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17 September 2021 in Conservation Biology
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Journal Article
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Xueyou LiXueyou Li
Xueyou Li
WHWenqiang Hu
Wenqiang Hu
WBWilliam Virgil Bleisch
William Virgil Bleisch
QLQuan Li
Quan Li
HWHongjiao Wang
Hongjiao Wang
XJXue-Long Jiang
Xue-Long Jiang
In the Anthropocene, understanding the impacts of anthropogenic influence on biodiversity and behavior of vulnerable wildlife communities is increasingly relevant to effective conservation. However, comparative studies aimed at disentangling the concurrent effect of different types of human disturbance on multifaceted biodiversity and on activity patterns of mammals are surprisingly rare. We applied a multiregion community model to separately estimate the effects of cumulative human modification (e.g., settlement, agriculture, and transportation) and human presence (aggregated presence of dogs, people, and livestock) on species richness and functional composition of medium‐ and large‐bodied mammals based on camera trap data collected across 45 subtropical montane forests. We divided the detected mammal species into three trophic guilds–carnivores, herbivores, and omnivores–and assessed the nocturnal shifts of each guild in response to anthropogenic activities. Overall, species richness tended to increase ( β coefficient = 0.954) as human modification increased but richness decreased as human presence increased ( β = –1.054). Human modification was associated with significantly lower functional diversity (mean nearest taxon distance [MNTD], β = –0.134; standardized effect sizes of MNTD, β = –0.397), community average body mass ( β = –0.240), and proportion of carnivores ( β = –0.580). Human presence was associated with a strongly reduced proportion of herbivores ( β = –0.522), whereas proportion of omnivores significantly increased as human presence ( β = 0.378) and habitat modification ( β = 0.419) increased. In terms of activity patterns, omnivores ( β = 12.103) and carnivores ( β = 9.368) became more nocturnal in response to human modification. Our results suggest that human modification and human presence have differing effects on mammals and demonstrate that anthropogenic disturbances can lead to drastic loss of functional diversity and result in a shift to nocturnal behavior of mammals. Conservation planning should consider concurrent effects of different types of human disturbance on species richness, functional diversity, and behavior of wildlife communities.

24 April 2009 in Oryx
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Journal Article
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WBWilliam Virgil Bleisch
William Virgil Bleisch
PBPaul J. Buzzard
Paul J. Buzzard
HZHuibin Zhang
Huibin Zhang
DXDonghua Xü
Donghua Xü
ZLZhihu Liu
Zhihu Liu
HWHowman Wong
Howman Wong
Females in most populations of chiru or Tibetan antelope Pantholops hodgsonii migrate each year up to 350 km to summer calving grounds, and these migrations characterize the Tibet/Qinghai Plateau. We studied the migratory chiru population at the Ullughusu calving grounds south-west of the Arjinshan Nature Reserve in Xinjiang, China. The 750–1,000 km2 of suitable habitat at Ullughusu is at 4,500–5,000 m with sparse vegetation. We used direct methods (block counts, vehicle and walking transects and radial point sampling) and an indirect method (pellet counts) during six summers to assess population density. We also witnessed and stopped two major poaching events, in 1998 and 1999 (103 and 909 carcasses, respectively). Surveys suggested a drop in population density from 1999 to 2000. Poaching was not seen during summer monitoring after 1999, and surveys in 2001 and 2006 suggest that the population density is stable or recovering. We compare the Ullughusu calving grounds with those in the western Kunlun and discuss possible routes for migrating females.

12 October 2023 in Animals
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NKNarayan Koju
Narayan Koju
KGKamal Raj Gosai
Kamal Raj Gosai
BBBIJAY BASHYAL
BIJAY BASHYAL
RBReena Byanju
Reena Byanju
ASArati Shrestha
Arati Shrestha
Laxman KhanalLaxman Khanal
Laxman Khanal
Conservation strategies for apex predators, like the snow leopard (Panthera uncia), depend on a robust understanding of their dietary preferences, prey abundance, and adaptability to changing ecological conditions. To address these critical conservation concerns, this study presents a comprehensive evidence on prey availability and preferences for snow leopards in the Lapchi Valley in the Nepal Himalayas from November 2021 to March 2023. Field data were collected through the installation of twenty-six camera traps at 16 strategically chosen locations, resulting in the recording of 1228 events of 19 mammalian species, including domesticated livestock. Simultaneously, the collection of twenty snow leopard scat samples over 3800 m above sea level allowed for a detailed dietary analysis. Photo capture rate index and biomass composition analysis were carried out and seasonal prey availability and consumption were statistically analyzed. A total of 16 potential prey species for the snow leopard were documented during the study period. Himalayan musk deer (Moschus leucogaster) was the most abundant prey species, but infrequent in the diet suggesting that are not the best bet prey for the snow leopards. Snow leopards were found to exhibit a diverse diet, consuming eleven prey species, with blue sheep (Pseudois nayaur) being their most consumed wild prey and horses as their preferred livestock. The Pianka’s index of dietary niche overlap between the summer and winter seasons were 0.576, suggesting a pronounced seasonal variation in food preference corroborating with the prey availability. The scarcity of larger preys in winter is compensated by small and meso-mammals in the diet, highlighting the snow leopard’s capacity for dietary plasticity in response to the variation in resource availability. This research suggests for the utilization of genetic tools to further explore snow leopard diet composition. Additionally, understanding transboundary movements and conducting population assessments will be imperative for the formulation of effective conservation strategies.

16 August 2020 in Nepalese Journal of Zoology
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Journal Article
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SDSujeeta Dhital
Sujeeta Dhital
SPSaroj Mani Paudel
Saroj Mani Paudel
STShreya Thapa
Shreya Thapa
WBWilliam Virgil Bleisch
William Virgil Bleisch
ASArati Shrestha
Arati Shrestha
NKNarayan Koju
Narayan Koju
The Chinese pangolin (Manis pentadactyla) is one of the world’s critically endangered species, and its distribution is little known in Nepal. This study aimed at understanding the distribution of Chinese pangolin in Nagarjun forest of Shivapuri-Nagarjun National Park, Nepal from September 2017 to May 2018. A total of 15 infrared cameras were used, these were installed randomly in the forest. Only three cameras at three different locations were able to capture photographs of Chinese pangolin. Altogether, three events, comprising 21 still photos of pangolin, their sign and other mammal species in the area were recorded. In addition, 94 pangolin burrows were noticed in the study area. The distribution of Chinese pangolin is influenced by the food, tree canopy and aspect of the area. Majority of the active burrows were found near to feeding burrows where ants and termite’s nest were found abundantly. In addition to Chinese pangolin, the study was able to capture twelve mammalian species including masked palm civet (Paguma larvata) and yellow-throated marten (Martes flavigula). These two species were often seen to enter or try to enter the active burrows of pangolins. The results suggest that Nagarjun Forest serves an important role in mammal conservation with high mammalian biodiversity.

14 October 2020 in Oryx
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Journal Article
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NKNarayan Koju
Narayan Koju
BBBijay Bashyal
Bijay Bashyal
BPBishnu Prasad Pandey
Bishnu Prasad Pandey
SSSatya Narayan Shah
Satya Narayan Shah
STShankar Thami
Shankar Thami
WBWilliam Virgil Bleisch
William Virgil Bleisch
The snow leopard Panthera uncia is the flagship species of the high mountains of the Himalayas. There is potentially continuous habitat for the snow leopard along the northern border of Nepal, but there is a gap in information about the snow leopard in Gaurishankar Conservation Area. Previous spatial analysis has suggested that the Lamabagar area in this Conservation Area could serve as a transboundary corridor for snow leopards, and that the area may connect local populations, creating a metapopulation. However, there has been no visual confirmation of the species in Lamabagar. We set 11 infrared camera traps for 7 months in Lapchi Village of Gaurishankar Conservation Area, where blue sheep Pseudois nayaur, musk deer Moschus leucogaster and Himalayan tahr Hemitragus jemlahicus, all snow leopard prey species, had been observed. In November 2018 at 4,100 m, 5 km south-west of Lapchi Village, one camera recorded three images of a snow leopard, the first photographic evidence of the species in the Conservation Area. Sixteen other species of mammals were also recorded. Camera-trap records and sightings indicated a high abundance of Himalayan tahr, blue sheep and musk deer. Lapchi Village may be a potentially important corridor for snow leopard movement between the east and west of Nepal and northwards to Quomolongma National Park in China. However, plans for development in the region present increasing threats to this corridor. We recommend development of a transboundary conservation strategy for snow leopard conservation in this region, with participation of Nepal, China and international agencies.

8 December 2021 in Birds
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Journal Article
Open access
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WBWilliam Virgil Bleisch
William Virgil Bleisch
PBPaul Buzzard
Paul Buzzard
DSDeang Souliya
Deang Souliya
Xueyou LiXueyou Li
Xueyou Li
Daniel BrooksDaniel Brooks
Daniel Brooks
Using camera-trap data, we describe the ecology and occupancy of several species of gamebirds while assessing associations at Namha National Protected Area (Lao People’s Democratic Republic). We detected three species of Arborophila Partridges, albeit in low numbers. Red Junglefowl Gallus gallus show typical diurnal activity, and we provide a record of a male–female pair commensally associated with a boar Sus scrofa. Silver Pheasants Lophura nycthemera have sex ratios slightly favoring females, and are mostly solitary; we provide novel findings of male age structure and rectrix molt. Gray Peacock Pheasants Polyplectron bicalcaratum sex ratios also favor females; males are recorded displaying as early as late February, while daily activity is somewhat bimodal, and we provide novel findings of male age structure. Analysis of the association between occupancy and 14 environmental covariates indicated that Silver Pheasant and Gray Peacock-Pheasant were associated with rougher terrain, and Red Junglefowl had higher occupancy far from well-groomed trails used for tourism. We discuss our results by comparing and contrasting our findings with other studies, and consider implications for conservation in the region.