Estimation of body weight in captive Amur tigers (<i>Panthera tigris altaica</i>)

Wang, Qi; Shi, Chunmei; Liú, Dan; Jiang, Guangshun

doi:10.1111/1749-4877.12612

Cited by 4 publications

(4 citation statements)

References 39 publications

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“…2021), especially many large mammals (Cao & Zhang 2021; Wang et al. 2021), and to strengthen their management in protected areas (PAs).…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, common species often achieve higher population density than conservation priority species. Therefore, it is essential to emphasize protection of rare and endangered species (Gao et al 2020;Yang et al 2021), especially many large mammals (Cao & Zhang 2021;Wang et al 2021), and to strengthen their management in protected areas (PAs).…”

Section: Conservation and Ecotourism Management Implicationsmentioning

confidence: 99%

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Ecotourist trail‐use affects the taxonomic, functional and phylogenetic diversity of mammals in a protected area: lessons for conservation management

et al. 2022

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Ecotourism, by definition, aims to engage peoples' interest in wildlife and the environment. The use of tourist roads and trails to access sites within protected areas (PAs) can detrimentally affect the behavior and distribution of species. The way mammals respond to anthropogenic pressures may differ across taxonomic, functional, and phylogenetic groups; nevertheless, how ecotourist trail-use affects these different diversity remains under-investigated. Here, we assessed 6 metrics of taxonomic, phylogenetic, and functional diversity for a mammal community in a PA in central China, recording how Trail use (using Trail type as a proxy) and habitat variables affected sightings and signs of mammals across 60 replicate 0.5 km transects. We then examined how Trail use affected the taxonomic, functional, and phylogenetic diversity indices of species (>1 kg). Using generalized liner mixed modeling, we identified that more used trail types had a greater adverse effect on all diversity richness indices than did less used trail types. Consequently, tourist pressure was associated with a general tendency to homogenize the site's mammal community. In contrast, the effects of Trail Types on all diversity evenness indices were non-significant. Furthermore, more developed and more heavily used trail types had a greater, significant negative effect on taxonomic, functional, and phylogenetic richness, whereas these richness indices were unaffected by minor trail types, used less intensively. As a general principle, lower biodiversity indices reduce ecosystem resilience, and so it is vital to better understand these responses to balance public access against biodiversity management in PAs.

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“…2021), especially many large mammals (Cao & Zhang 2021; Wang et al. 2021), and to strengthen their management in protected areas (PAs).…”

Section: Discussionmentioning

confidence: 99%

Section: Conservation and Ecotourism Management Implicationsmentioning

confidence: 99%

Ecotourist trail‐use affects the taxonomic, functional and phylogenetic diversity of mammals in a protected area: lessons for conservation management

et al. 2022

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“…2021, 2022; Wang et al. 2021). In this study, we used UAV and infrared cameras as video acquisition equipment, and infrared thermal pictures of Amur tigers and their main prey, such as sika deer ( Cervus nippon ), roe deer ( Capreolus pygargus ), reindeer ( Rangifer tarandus ), and red deer ( Cervus elaphus ) (Gu et al.…”

Section: Introductionmentioning

confidence: 99%

“…Since Amur tiger (Panthera tigris altaica) are wandering across the Sino-Russia border areas, it has attracted considerable attention as monitoring, protecting, and saving this endangered rare big predator and their prey species are popular topics of interest (Hou et al 2020;Qi et al 2021Qi et al , 2022Wang et al 2021). In this study, we used UAV and infrared cameras as video acquisition equipment, and infrared thermal pictures of Amur tigers and their main prey, such as sika deer (Cervus nippon), roe deer (Capreolus pygargus), reindeer (Rangifer tarandus), and red deer (Cervus elaphus) (Gu et al 2018), as the research objects.…”

Section: Introductionmentioning

confidence: 99%

Recognition of big mammal species in airborne thermal imaging based on YOLO V5 algorithm

et al. 2022

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Unmanned aerial vehicle (UAV) technology, artificial intelligence, and the relevant hardware can be used for monitoring wild animals. However, existing methods have several limitations. Therefore, this study explored the monitoring and protection of Amur tigers and their main prey species using images from UAVs by optimizing the algorithm models with respect to accuracy, model size, recognition speed, and elimination of environmental interference. Thermal imaging data were collected from 2000 pictures with a thermal imaging lens on a DJI M300RTK UAV at the Hanma National Nature Reserve in the Greater Khingan Mountains in Inner Mongolia, Wangqing National Nature Reserve in Jilin Province, and Siberian Tiger Park in Heilongjiang Province. The YOLO V5s algorithm was applied to recognize the animals in the pictures. The accuracy rate was 94.1%, and the size of the model weight (total weight of each model layer trained with the training set) was 14.8 MB. The authors improved the structures and parameters of the YOLO V5s algorithm. As a result, the recognition accuracy rate became 96%, and the model weight was 9.3 MB. The accuracy rate increased by 1.9%, the model weight decreased by 37.2% from 14.8 MB to 9.3 MB, and the recognition time of a single picture was shortened by 34.4% from 0.032 to 0.021 s. This not only increases the recognition accuracy but also effectively lowers the hardware requirements that the algorithm relies on, which provides a lightweight fast recognition method for UAV-based edge computing and online investigation of wild animals.

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Growth and allometric curves of southern brown howler monkey (Alouatta guariba): Insights on its ontogeny and conservation

Mariotto,

Dada,

Campos da Silva

et al. 2024

American J Primatol

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Ontogenetic sexual dimorphism is observed in different primate species, with ecological and evolutionary relationships explaining this pattern. Understanding the growth of the southern brown howler monkey elucidates not only the ecology and evolution but also contributes to conservation projects for this species. Throughout 20 years of the Centro de Pesquisas Biológicas de Indaial—Projeto Bugio, Brazil, we collected morphological data on 105 howlers of the Alouatta guariba species to identify the growth differences between ontogenetic categories and sexes and generate a growth curve to estimate the age of rescued individuals. Linear measurements were employed to obtain body length as well as the dimensions of the head and limbs. All individuals were also weighed to obtain body mass. We assessed growth rate and duration using allometric analysis based on the individuals' ages. We compared growth rate and duration among infant, juvenile, and adult howlers and between sexes. We provide growth curves for body size for both sexes using the Von Bertalanffy model. Infants have accelerated growth rate in comparison to the juveniles and adults, with no differences between sexes in establishing body length at this ontogenetic stage. Males have a prolonged development duration from the juvenile stage, reaching adulthood later than females, which explains the body length differences found in this species. Variables of head and limbs analyzed also showed differences in growth rate and duration, but not so consistently among ontogenetic stages. Mass was not a good variable to understand the growth differences of the animals, since many arrived feeble in the project and may have lost mass due to different circumstances in old age. Therefore, growth curves were obtained only for body length, allowing the estimation of the age of these animals when rescued from the wild to more effectively provide needed care in captivity.

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Estimation of body weight in captive Amur tigers (Panthera tigris altaica)

Cited by 4 publications

References 39 publications

Ecotourist trail‐use affects the taxonomic, functional and phylogenetic diversity of mammals in a protected area: lessons for conservation management

Ecotourist trail‐use affects the taxonomic, functional and phylogenetic diversity of mammals in a protected area: lessons for conservation management

Recognition of big mammal species in airborne thermal imaging based on YOLO V5 algorithm

Growth and allometric curves of southern brown howler monkey (Alouatta guariba): Insights on its ontogeny and conservation

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