MetadataWeevils2021

Here, we describe the results of a metadata analysis of all milfoil weevil (known) augmentation studies completed North America. Augmentation was completed in 133 experiments, and within the 133 cases, 34 lakes throughout the US and Canada are represented. The mifloil weevil is known to be a natural biocontrol for Eurasian Watermilfoil (EWM), and studies record lake characteristics, as well as augmentation strategy and if the weevil was successful at EWM reduction (studies completed within a single growing season). The spreadsheet table consists of a list of a predictors (we call features), that are believed to predict milfoil weevil success at watermilfoil reduction (units are also stated in the spreadsheet). In addition, success (in terms of watermilfoil reduction) is recorded in one of 5 ways. The first, called "All Augments" below, is a the qualitative statement of EWM increase (marked 0 for failure) or EWM decrease (marked 1 for success). 1. All Augments - Contains values for all studies that augmented lakes with weevils (N=133). 2. Output Stem Density - Contains only studies that had data in the column “Difference dry Milfoil density (stems/m2)”. Here, N=47. 3. Output Dry Weight Density - Studies that had data in the column “Difference dry Milfoil density (g/m2)”. Here, N=44. 4. Output Percent - Studies with data in column “% Difference Milfoil density”. Here, N=95 5. Relative Abundance - Studies with data in column “Change % Relative Abundance”. This is the difference (as a percent) in the proportion of EWM in a m2 grid, from the start to the end of the experiment, compared with native plants. Here, N=50. Estimates: Highlighted cells are estimated values for a certain feature. For more information on data and methodology, please contact the contributors.本研究详述了北美地区已完成的所有狐草象甲（milfoil weevil）增殖投放研究的元分析（metadata analysis）结果。本次元分析涵盖133项增殖投放实验，涉及美国与加拿大境内共34个湖泊。狐草象甲已知可作为欧亚狐草（Eurasian Watermilfoil，EWM）的天然生物防治媒介，相关研究记录了湖泊特征、增殖投放策略，以及象甲在单次生长季内实现EWM防控的效果。 本数据集的电子表格包含一系列被视为狐草象甲狐草防控效果预测因子（predictors）的变量，本研究将其称为特征变量（features），电子表格中同时标注了各指标的计量单位。此外，狐草防控效果（以狐草消减程度衡量）共通过5种方式记录。第一种为下文所述的「全投放组（All Augments）」，即以定性描述记录EWM的增减情况：若EWM数量增加则标记为0（代表防控失败），若EWM数量减少则标记为1（代表防控成功）。 1. 全投放组（All Augments）：收录所有向湖泊投放象甲的研究数据（样本量N=133）。 2. 茎秆密度结果（Output Stem Density）：仅收录包含"Difference dry Milfoil density (stems/m2)"列数据的研究，样本量N=47。 3. 干重密度结果（Output Dry Weight Density）：收录包含"Difference dry Milfoil density (g/m2)"列数据的研究，样本量N=44。 4. 百分比结果（Output Percent）：收录包含"% Difference Milfoil density"列数据的研究，样本量N=95。 5. 相对丰度（Relative Abundance）：收录包含"Change % Relative Abundance"列数据的研究。该指标指实验周期内，每平方米样方中EWM占比相较于本地植物占比的差值（以百分比形式呈现），样本量N=50。 估算值：表格中高亮单元格为特定特征变量的估算结果。 如需了解数据集与研究方法的更多详情，请联系数据集贡献者。