Effectiveness of signs of activity as relative abundance indices for wild boar

Higashide, Daishi; Kuriyama, Takeo; Takagi, Shun; Nakashima, Yoshihiro; Fukasawa, Keita; Yajima, Gota; Kasada, Minoru; Yokoyama, Masahiro

doi:10.2981/wlb.00869

Cited by 7 publications

(2 citation statements)

References 57 publications

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“…Regarding the estimation of ecological parameters, camera traps have been broadly used to monitor diferent ecological, behavioural, and sanitary aspects of wild boar. Specifcally, it has been used to monitor population densities and abundance [33,41,42]; movement parameters such as activity level and daily distance travelled [21,43,44]; species interactions [14,45,46]; reproduction success [23]; and diseases transmission risk points [11,47] among others. Even more recently, some studies have discussed the utility of camera trapping to be implemented in integrated wildlife monitoring programs targeted at wildlife health and host community monitoring [48].…”

Section: Discussionmentioning

confidence: 99%

Not Just Pictures: Utility of Camera Trapping in the Context of African Swine Fever and Wild Boar Management

Palencia

Vada

Zanet

et al. 2023

Transboundary and Emerging Diseases

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African swine fever (ASF) is a highly contagious disease affecting all suids and wild boar (Sus scrofa). Since 2007, ASF has spread to more than 30 countries in Europe and Asian regions, and the most recent outbreak has been in mainland Italy (reported on January 2022). When the genotype II of the ASF virus infects a population, a mortality rate close to 90% is usually reported. This drop in wild boar abundance produces a cascade effect in the entire ecosystem. In this context, effective monitoring tools for deriving management parameters are a priority aspect, and the utility of camera trapping could have been overlooked. Here, sampling the infected area in north Italy, we showed the utility of camera traps in the context of ASF infection. Specifically, we used 43 camera traps randomly distributed to (i) estimate movement parameters and population density of wild boar, roe deer (Capreolus capreolus), and wolf (Canis lupus); (ii) quantify wild boar recruitment; and (iii) assess whether the human restriction rules are being met. On the first spring after the outbreak detection, our results for wild boar indicated a density of 0.27 ind·km−2 ± 0.11 (standard error, SE), a daily activity level of 0.49 ± 0.07 (i.e., 11.76 h·day−1), a daily distance travelled of 9.07 ± 1.80 km·day−1, a litter size of 1.72 piglets·group−1, and a 72% of pregnant females. Despite human outdoor activities being restricted in the infected zone, we recorded human presence in 19 camera traps. The wide range of parameters estimated from the camera trap data, together with some intrinsic and practical advantages of this tool, allows us to conclude that camera traps are well positioned to be a reference approach to monitor populations affected by ASF. The population-specific parameters are of prime importance for optimizing ASF control efforts.

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Section: Discussionmentioning

confidence: 99%

Not Just Pictures: Utility of Camera Trapping in the Context of African Swine Fever and Wild Boar Management

Palencia

Vada

Zanet

et al. 2023

Transboundary and Emerging Diseases

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“…In this study, we propose a method of integrating administration data with a camera trapping technique in Chiba Prefecture, central Japan. In this method, first, the absolute abundance of local populations is estimated by the REST (random encounter and staying time) model, a method to estimate population size by observing camera trap videos without individual recognition and information on animal movement speed (Higashide et al, 2021; Nakashima et al, 2018; Nakashima et al, 2020; Palencia et al, 2021). Then, we explore the capturing rate for CPUE by the relationships between CPUE from administration data and the absolute abundance from the REST model.…”

Section: Introductionmentioning

confidence: 99%

State‐space model combining local camera data and regional administration data reveals population dynamics of wild boar

et al. 2022

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Recent increases in wildlife cause negative impacts on humans through both economic and ecological damage, as well as the spread of pathogens. Understanding the population dynamics of wildlife is crucial to develop effective management strategies. However, it is difficult to estimate accurate and precise population size over large spatial and temporal scales because of the limited data availability. We addressed these issues by first fitting a random encounter and staying time (REST) model based on camera trap data to construct an informative prior distribution for a capture rate parameter in a harvest‐based Bayesian state‐space model. We constructed a Bayesian state‐space model that integrated administration data on the number of captured wild boar with the prior distribution of capture efficiency estimated by camera trap data. The model with informative prior distribution from the REST model successfully estimated population dynamics, whereas the model using only the administration data did not, owing to a lack of parameter convergence. We identified areas where (1) wild boars exhibit a high potential population growth rate and a high carrying capacity, (2) current trapping efforts are effectively suppressing local populations, and (3) trapping reinforcement is required to control populations in the whole region. The model could be used to predict future trends in populations under the assumptions of ongoing trapping pressure. This will help identify spatially explicit trapping efforts to achieve target population levels.

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Free-roaming dogs but not invasive mammals established in the wild endanger the flightless kagu of New Caledonia

Theuerkauf

Rouys

Bloc

et al. 2023

Biological Conservation

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Effectiveness of signs of activity as relative abundance indices for wild boar

Abstract: BioOne Complete (complete.BioOne.org) is a full-text database of 200 subscribed and open-access titles in the biological, ecological, and environmental sciences published by nonprofit societies, associations, museums, institutions, and presses.

Cited by 7 publications

References 57 publications

Not Just Pictures: Utility of Camera Trapping in the Context of African Swine Fever and Wild Boar Management

Not Just Pictures: Utility of Camera Trapping in the Context of African Swine Fever and Wild Boar Management

State‐space model combining local camera data and regional administration data reveals population dynamics of wild boar

Free-roaming dogs but not invasive mammals established in the wild endanger the flightless kagu of New Caledonia

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