Studying Large Mammals With Imperfect Detection: Status and Habitat Preferences of Wild Cattle and Large Carnivores in Eastern <scp>C</scp>ambodia

Gray, Thomas N. E.

doi:10.1111/j.1744-7429.2011.00846.x

Cited by 23 publications

(19 citation statements)

References 28 publications

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“…Camera-traps are widely used in South East Asia for conservation and research particularly for inventorying ground-dwelling large mammal diversity within conservation landscapes (Phan, Prum & Gray, 2010;Moo, Froese & Gray, 2017) and estimating species density and abundance for conservation impact monitoring (Rayan & Mohamad, 2009;Gray, 2012;Gray & Prum, 2012). However, robustly estimating species abundance from camera-trap data is extremely difficult unless animals have unique individual markings such as tiger Panthera tigris or leopard P. pardus (Karanth & Nichols, 1998).…”

Section: Introductionmentioning

confidence: 99%

Monitoring tropical forest ungulates using camera‐trap data

Gray¹

2018

Journal of Zoology

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Tropical forest ungulates are poorly known and, despite their ecological and conservation significance, there are few studies on their density and abundance. I estimated densities of lesser oriental chevrotain Tragulus kanchil in the Southern Cardamom National Park, south‐west Cambodia using camera‐trap encounter rates and fitting a random encounter model (REM) that does not require individual identification of animals. This represents the first use of REM on forest ungulates in mainland tropical Asia and provides the first density estimate for any chevrotain species in mainland South East Asia. Sixty‐five camera‐trap stations generated 501 encounters of lesser oriental chevrotain across >8200 camera‐trap nights within a systematic random camera‐trap grid of 200 km2 in the Southern Cardamom National Park. Density of lesser oriental chevrotain was estimated at between 57 and 98 (trueXfalse¯ 81) individuals per km2. The random deployment of camera‐traps, a prerequisite of the REM, did not prevent the detection of the majority of ground‐dwelling large mammal species likely to be present in the study site. Despite its slow uptake by field conservationists, the REM may have potential for monitoring tropical ungulates particularly in dense evergreen forest where other methodologies, for example, distance‐based line transect sampling are unsuitable.

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Section: Introductionmentioning

confidence: 99%

Monitoring tropical forest ungulates using camera‐trap data

Gray¹

2018

Journal of Zoology

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“…We assembled a detection history matrix for each of the 18 large mammal species recorded, and following previous studies, defined a sampling occasion as seven camera trap‐days (Gray , Ahumada et al . ).…”

Section: Methodsmentioning

confidence: 99%

“…DATA ANALYSIS.-We assembled a detection history matrix for each of the 18 large mammal species recorded, and following previous studies, defined a sampling occasion as seven camera trap-days (Gray 2012, Ahumada et al 2013. We analyzed data using the single-season occupancy framework, an approach where occupancy and detection parameters are estimated simultaneously using replicated detection/non-detection surveys (MacKenzie et al 2002, MacKenzie et al 2006.…”

Section: Methodsmentioning

confidence: 99%

Assessing the conservation value of secondary savanna for large mammals in the Brazilian Cerrado

et al. 2017

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Debate about the conservation value of secondary habitats has tended to focus on tropical forests, increasingly recognizing the role of secondary forests for biodiversity conservation. However, there remains a lack of information about the conservation value of secondary savannas. Here, we conducted a camera trap survey to assess the effect of secondary vegetation on large mammals in a Brazilian Cerrado protected area, using a single‐season occupancy framework to investigate the response of individual species (species‐level models) and of all species combined (community‐level models). In addition, we investigated the cost effectiveness of different sampling designs to monitor globally threatened species in the study area. At the community level, savanna that regenerated from eucalyptus plantation had similar occupancy estimate as old growth areas. At the species level, none of the ten species individually assessed seemed to respond to succession stage, with greater support for the effect of other covariates on occupancy, such as distance from water and vegetation physiognomy. These results demonstrate that secondary vegetation does not appear to negatively impact large mammals in the study area and suggest that, given a favorable context, Cerrado mammals can recolonize and use secondary savannas that regenerated from clearcut. However, our study area should be considered a best‐case scenario, as it retained key ecological attributes of high‐value secondary habitats. Our simulations showed that a sampling design with 60 camera trap sites surveyed during nine occasions is appropriate to monitor most globally threatened species in the study area, and could be a useful starting point for new monitoring initiatives in other Cerrado areas.

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“…False absences are cor- rected by conducting replicated surveys within a cameratrap location thereby allowing estimation of the probability of detecting at least one individual of a species during a survey given its presence (Mackenzie et al 2006). In the occupancy modelling, these are essentially two nested binomial logistic regressions whereby the first models the true presence and absence of a species (site occupancy, w) and the second models detection and nondetection conditional (detection probability, P)o na species being present (Gray 2012). Habitat covariates can be built into reduce variance in the estimated detection probability and occupancy (Mackenzie et al 2006).…”

Section: Habitat Preferencesmentioning

confidence: 99%

Habitat preferences of medium/large mammals in human disturbed forests in Central Japan

Tsujino¹,

Yumoto²

2014

Ecological Research

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It is a great concern whether human disturbed forest, i.e., secondary forest or monoculture forest, can be a habitat for the wildlife. We examined habitat preference of medium/large terrestrial mammal species in a human‐disturbed mountainous settlement area of Akiyama Region, Central Japan, by using camera‐traps, which were placed at conifer plantation forest, high/low‐disturbed deciduous broad‐leaved forest, and broad‐leaved/conifer mixed forest in 2008 and 2009. Camera‐traps were operational for 4568.6 trap‐nights producing 740 photo‐captures of 13 medium/large terrestrial mammal species. Japanese serow and Japanese hare dominated 54 % of all photo‐captures. Low‐disturbed deciduous broad‐leaved forest showed the richest mammal fauna (12 spp.). We suggested that fruit trees and understory vegetation provided suitable habitat for frugivorous as well as herbivorous mammals. The mixed forest showed the lowest mammal fauna (6 spp.), which located higher elevation. High‐disturbed deciduous broad‐leaved forest (9 spp.) was also supposed to be a better habitat for some frugivorous mammals and herbivorous mammals, but tended to be avoided by Japanese marten and Japanese macaque. Conifer plantation forest (7 spp.) with understory vegetation was supposed to be a better habitat for Japanese serow and Japanese hare, but not for the other species. Without fruit trees, conifer plantation forest was supposed to be non‐attractive habitat for frugivorous mammals. We demonstrated that, if a forest had been disturbed by human, the forest can be a habitat for terrestrial herbivores, but this was not always true for frugivores.

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Studying Large Mammals With Imperfect Detection: Status and Habitat Preferences of Wild Cattle and Large Carnivores in Eastern Cambodia

Cited by 23 publications

References 28 publications

Monitoring tropical forest ungulates using camera‐trap data

Monitoring tropical forest ungulates using camera‐trap data

Assessing the conservation value of secondary savanna for large mammals in the Brazilian Cerrado

Habitat preferences of medium/large mammals in human disturbed forests in Central Japan

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