A density estimation model of plateau pika (Ochotona curzoniae) supporting camera‐monitoring programs
Open Access
- 13 July 2021
- journal article
- research article
- Published by Wiley in Ecology and Evolution
- Vol. 11 (15), 10566-10581
- https://doi.org/10.1002/ece3.7865
Abstract
As an important species in the Qinghai-Tibet Plateau, the roles played by plateau pikas in grassland degradation and protection are controversial. The behavior characteristics and population density of this species are important in answering this question, but these traits have not been fully elucidated to date. Camera-capture methods have been used widely in recent years to characterize or calculate population density with the advantage of simple operation and nonintrusive investigation. However, establishing the relationship between actual population density and monitoring data with the condition that individual identification is not possible is a major challenge for this method. In this study, a model composed of a behavioral module and a burrow system module is proposed and applied to simulate the moving path of each individual pika. Based on Monte Carlo method, the model is used to develop the relationship between population density and recorded capture number, which is compared with the results derived from the random encounter model (REM) based on field observations. The simulated results mixed with the calculated density based on observation data could reach R2 = 0.98 using linear fitting, with proper parameter settings. A novel index named activity intensity of pikas per population density is also proposed, providing information on both the ecological physical characteristics and monitoring space. The influence of different parameters on this index, mainly the pika number per burrow system, pika activity time outside the burrow, and activity intensity, is discussed. The proposed methodology can be applied to different scenarios in further studies when behavioral characteristics of pikas change for such reasons as climate change and vegetation degradation.Funding Information
- National Natural Science Foundation of China (51879137, 51979276, 91847302)
This publication has 36 references indexed in Scilit:
- From the institute's Photo LibraryPolar Research, 2011
- Rangeland degradation on the Qinghai-Tibetan plateau: A review of the evidence of its magnitude and causesJournal of Arid Environments, 2010
- Camera trapping photographic rate as an index of density in forest ungulatesJournal of Applied Ecology, 2009
- Estimating animal density using camera traps without the need for individual recognitionJournal of Applied Ecology, 2008
- Population dynamics and responses to management of plateau pikas Ochotona curzoniaeJournal of Applied Ecology, 2007
- Small mammalian herbivores as mediators of plant community dynamics in the high-altitude arid rangelands of Trans-HimalayaBiological Conservation, 2006
- The plateau pika (Ochotona curzoniae) is a keystone species for biodiversity on the Tibetan plateauAnimal Conservation, 1999
- Nearest neighbourhood operations with generalized Voronoi diagrams: a reviewInternational Journal of Geographical Information Science, 1994
- Social Relationships of Adult Black-Lipped Pikas (Ochotona curzoniae)Journal of Mammalogy, 1991
- Monte Carlo simulation program for ecosystemsBioinformatics, 1986