金沙江流域鱼类的系统保护规划研究

FISH SYSTEMATIC CONSERVATION PLANNING IN THE JINSHA RIVER BASIN

  • 摘要: 在全面整理和收集金沙江流域214种和亚种鱼类的分布及生物学特征的基础上, 采用系统保护规划的方法, 对流域内的鱼类保护进行了研究。首先, 我们确定了物种分布的范围。对分布较广的种类, 通过物种分布模型, 结合气候、河流景观、土地利用、土壤等环境因子, 预测物种在全流域内分布区; 对其余鱼类则直接使用采样点作为分布区。其次, 采用系统保护规划软件, 规划了流域内保护区网络。在规划过程中, 我们根据鱼类运动能力、分布广度和保护级别, 设定了不同的保护目标, 并对现有保护区的保护情况进行评估。结果表明, 模型的最优解选择了486个单元共47950 km2, 占所有规划单元数量的7.7%。而被现有湿地相关保护区保护的规划单元仅包含了127种鱼类, 占流域鱼类总数的59.3%, 且其中109种仍需增加保护面积, 说明现有保护区不足以保护流域内的鱼类; 在现有基础上, 保护区保护的规划单元面积至少需增加55.9%才能达成所设定的保护目标。

     

    Abstract: We compiled the distribution and traits of 214 fish species and subspecies in the Jinsha River basin to investigate systematic and effective conservation planning in the basin. First, we modelled the distribution of widespread species throughout the basin with environmental factors such as climate, riverscape, land-use, and soil type; we used the occurrences as the distribution for other species. We planned the protected area (PA) network with the Marxan software to determine the species-specific conservation targets (grouped by mobility, distribution range, and conservation status) and evaluate the protection status of the current wetlands PAs. The best solution selected 486 planning units (47950 km2) that was 7.7% of the total planning units. The current wetlands PAs was not enough for fish conservation, which shelters 59.3% of all fishes (127 species) and 109 species require additional conservation area. The planning units’ area protected by the wetlands PA need to expand 55.9% to reach our conservation target.

     

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