Data for: Predator size-structure and species identity determine cascading effects in a coastal ecosystem

This data accompanies a paper to be published in Ecology and Evolution "Predator size-structure and species identity determine cascading effects in a coastal ecosystem" by John N Griffin (Swansea University, Wales, UK) and Brian R Silliman (Duke University). <br>Data were collected on 72 experimental field plots during and after a 4-month manipulation of predatory crabs in a salt marsh in Georgia USA in summer 2010. <br>The main factors manipulated were crab species identity and size structure. Additionally, the 'predator free' control allows the effects of predator presence/absence to be inferred.<br>The dataset is contained in 3 sheets, with an additional sheet containing metadata. The first sheet ("Treatments") contains the raw response variables and derived response variables for all treatment replicates. The second sheet ("Control") contains the raw response variables for the control (predator free) replicates. The third sheet contains data on the survival of predator crabs based on surveys conducted bi-weekly throughout the experiment. <br><br><br>本数据集配套一篇即将发表于《Ecology and Evolution》的论文《捕食者体型结构与物种身份（species identity）决定海岸生态系统的级联效应（cascading effects）》，作者为英国威尔士斯旺西大学的John N Griffin与美国杜克大学的Brian R Silliman。 数据集采集自2010年夏季美国佐治亚州一处盐沼，研究人员在此开展了为期4个月的捕食性螃蟹操控实验，并于实验期间及结束后，从72块野外实验样地（experimental field plots）收集了相关数据。 本次操控实验的核心操控变量为螃蟹的物种身份（species identity）与体型结构（size structure）。此外，研究设置了“无捕食者（predator free）”对照组，以推断捕食者存在与否所产生的生态效应。 本数据集共包含3张工作表，另有1张工作表存储元数据（metadata）。第一张工作表（"Treatments"）收录了所有处理重复组（treatment replicates）的原始响应变量（raw response variables）与衍生响应变量（derived response variables）；第二张工作表（"Control"）收录了“无捕食者”对照组重复组的原始响应变量；第三张工作表记录了整个实验期间每两周（bi-weekly）开展一次的调查所得的捕食性螃蟹存活数据。