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Potential distribution and its influence factors of plateau pika(Ochotona curzoniae) in Source Region of Yellow River Basin using BIOMOD

DU Jiaxing, SUN Yi, XIANG Bo, CHEN Jianjun, QIN Yu, HOU Xiumin, YU Hongyan, YI Shuhua

Plateau pika (Ochotona curzoniae) is widely distributed in Source Region of Yellow River Basin(SRYRB) and is a key species in alpine grassland ecosystem.In this study, the potential distribution of plateau pika in SRYRB was studied using BIOMOD species distribution models integration platform and UAVRS (unmanned aerial vehicle remote sensing) . The spatial distribution regularity of plateau pika was revealed and the limiting factors affecting its spatial distribution were explored.

In this study, UAV field survey was conducted in SRYRB from July to August 2018, and more than 3,000 aerial photographs were obtained, from which 208 data of presence/ absence points of plateau pika were extracted. Seventeen variables were selected as explanatory variables from 48 environmental factors including climate, vegetation, topography and soil. The potential distribution of plateau pika in this region was predicted by BIOMOD. Compared with traditional ground survey, this method is more efficient and suitable for large-scale investigation. The predicted results can provide scientific basis for rodent control and provide new ideas for future research.

Figure 1 Sampling points in Source Region of Yellow River Basin

The best performance of 10 SDMs in BIOMOD is random forest. The average TSS, AUC and coefficient of variation are 0.57, 0.83, 11% and 5% respectively. The model can accurately predict the distribution of plateau pika in SRYRB, and can maintain good stability in multiple operations. The application of BIOMOD in this region can reduce the uncertainty and error of prediction and improve the accuracy of prediction.

Figure 2 Prediction of plateau pika distribution based on RF in Source Region of Yellow River Basin

The distribution of plateau pika is influenced by many environmental factors, such as altitude, NDVI annual average, slope, soil pH, annual precipitation, slope direction and annual average radiation. The distribution of plateau pika is not only related to environmental factors, but also closely related to human activities, such as grazing, rodent control, hawk rack layout and so on.

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