基于红外相机监测的汪清自然保护区东北豹种群动态

doi:10.11707/j.1001-7488.20190521

摘要/Abstract

摘要： [目的]东北豹是分布最北、种群数量最小的豹亚种，濒危等级为"极危"。分析采用相机监测技术得到的汪清保护区内东北豹种群数量和分布情况的长期动态，为这一濒危物种的保护提供科学依据。[方法]2013年秋-2017年秋，在汪清保护区内东北豹主要分布区以每3 km×3 km网格1对的密度布设相机。采用相对丰富度指数（relative abundance indices，RAI）计算东北豹相对丰富度，以99%核密度等值线定义东北豹分布区，在Extract Compare软件中进行个体识别。在CAPTURE软件中对有效监测期的数据进行闭合种群检验、适宜模型评估和种群数量估计。以8 km为半径，在相机布设处向周边外延绘制缓冲区作为有效监测面积，评估东北豹种群密度。[结果]在9个监测季，东北豹RAI指数波动在0.34~2.12之间。2013年秋季东北豹分布区为201 km²，2017年秋季分布区为992 km²。共识别东北豹个体9只，其中成年雌性和雄性各3只、幼崽2只、性别不明个体1只。在种群数量低的情况下，CAPTURE闭合种群检验效力并不强，检验结果总体偏低。M_h模型（假设拍摄率有个体差异）选择标准得分在2015春、2015秋、2016秋、2017春4个监测季最高，在其他5个监测季得分仅次于M₀（假设拍摄率一致）。卡方拟合优度检验显示，M_b（假设捕获前后拍摄率有差异）、M_t（假设不同时段拍摄率有差异）模型评估捕获率与M₀模型无显著差异。研究期间东北豹种群密度波动在0.12~0.88只·（100 km²）^-1，种群总捕获率整体较高，但2017年春季拍摄个体仅占种群评估数量的0.43。[结论]受地理因素和猎物丰富度变化影响，东北豹时空分布具有异质性。CAPTURE闭合种群检验对小样本检验效力不强。M_h假设是进行东北豹种群数量评估的适宜模型，"拍摄羞怯反应"会导致种群密度评估结果偏高。

关键词: 东北豹, 红外相机监测, 时空分布格局, 种群密度评估, 野生动物

Abstract: [Objective] Far Eastern Leopard (Panthera pardus orientalis) disperses in the northernmost region and maintains the minimum population of Panthera pardus subspecies. It is evaluated as Critical Endangered in IUCN Red List. In this study, we analyzed long-term dynamic of population size and distribution of Far Eastern Leopard in Wangqing Nature Reserve and expected to provide scientific data for the protection of this endangered species.[Method] From Autumn 2013 to Autumn 2017, cameras were set up with a density of 1 pair per 3 km×3 km grid in the main leopard habitat in Wangqing Nature Reserve. The relative abundance indices (RAI) was used to calculate leopard abundance, the distribution area was defined by 99% kernel density contour, and individual was identified in Extract Compare software. The closure test, model selection and population estimation were performed for the data of effective monitoring period with CAPTURE software. The effective trapping area was estimated by projecting an 8 km radius buffer around each camera trap location. Then we calculated population density using effective trapping area.[Result]The RAI of leopard varied from 0.34 to 2.12 during 9 monitoring seasons. The distribution area of leopard was 201 km² in Autumn 2013 and 992 km² in Autumn 2017. A total of 9 individuals were identified, including 3 females, 3 males, 2 cubs and 1 unrecognizable. Both the value and the power of CAPTURE closure test were low when population size was small. The model selection criterions of M_h (heterogeneity effects model) were highest in 4 monitoring seasons, and second only after M₀ (null model) in the other 5 seasons. The goodness of fit tests of M₀ vs M_b(behaviour effects model) and M₀ vs M_t(time effects model)showed that there were no significant differences between groups. The population density of leopard ranged from 0.12 to 0.88 individual per 100 km² during research period. The value of captured individual/estimated population size was relatively high in general, albeit there was a low value of 0.43 in Spring 2017.[Conclusion] The distribution pattern of leopard obviously showed spatiotemporal heterogeneity due to geographic variance and prey abundance fluctuation. CAPTURE closed population test was ineffective for small sample test. M_h model was proper to evaluate leopard population. The capture rates showed no variance after trap or in different trap occasions. Leopard population density would be overestimated due to trap-shy response.

Key words: Panthera pardus orientalis, camera trap, spatiotemporal patterns, population density evaluation, wild animal

中图分类号:

S718.65

孔维尧, 孙权, 刘鑫鑫, 曲丽, 王福友, 姚明远, 邹红菲. 基于红外相机监测的汪清自然保护区东北豹种群动态[J]. 林业科学, 2019, 55(5): 188-196.

Kong Weiyao, Sun Quan, Liu Xinxin, Qu Li, Wang Fuyou, Yao Mingyuan, Zou Hongfei. Population Dynamic of Far Eastern Leopard(Panthera pardus orientalis) in Wangqing Nature Reserve Based on Infrared Camera Monitoring[J]. Scientia Silvae Sinicae, 2019, 55(5): 188-196.

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