How stygofauna respond to groundwater drawdown

Three stygofauna taxa were examined how they responded to groundwater drawdown under different sedimentary environments.Treatments:Stygofauna taxa - Amphipoda, Harpacticoid and CyclopoidaDrawdown rates - Fast 400 cm/day, medium 100 cm/day, slow 40 cm/day, very slow 4 cm/day and control no flow.Sedimentary environments - Coarse gravel, fine gravel, coarse sand, medium sand and fine sand.Upon completion of drawdown experiments, the location of stygofauna with columns were counted by separating columns into segments (15-12 cm (top), 12-9 cm, 9-6 cm, 6-3 cm and 3-0 cm (bottom), and counting under a microscope.See methods.txt file for more detailed methods.

本研究针对3个地下穴居动物类群（stygofauna）在不同沉积环境下对地下水水位降深的响应开展了实验考察。实验处理方案如下：受试类群包括端足目（Amphipoda）、猛水蚤目（Harpacticoid）与剑水蚤目（Cyclopoida）；水位降深速率分为快速（400 cm/天）、中速（100 cm/天）、慢速（40 cm/天）、极慢速（4 cm/天）四个梯度，另设无水流的对照组；沉积环境涵盖粗砾石、细砾石、粗砂、中砂及细砂五种类型。水位降深实验结束后，将实验柱体按深度划分为5个区段（15~12 cm为顶层、12~9 cm、9~6 cm、6~3 cm与3~0 cm为底层），通过显微镜计数各柱体内的地下穴居动物以统计其空间分布位置。详细实验方法请参阅methods.txt文件。