Does a lack of juveniles indicate a threat? Understanding body size distributions in a group of long-lived vertebrates

This data set contains size and/or sex data from 41,021 freshwater turtles from 38 species and 428 populations located in parts of Australia both with and without introduced foxes, as well as populations in the United States of America, which naturally have raccoons (Procyon lotor), foxes, and other nest predators. The goal was to examine population-level body size distributions to establish a baseline for “typical” turtle populations and test whether populations that are exposed to introduced foxes have proportionately fewer juveniles compared to both AU populations that lack introduced foxes and USA populations that are naturally exposed to nest predators. We additionally conducted analyses on the biases of trapping methods, effects of sample size, and effects of water body type. This data set was assembled by pooling the data from numerous researchers., , # Does a lack of juveniles indicate a threat? Understanding body size distributions in a group of long-lived vertebrates Dataset DOI: [10.5061/dryad.47d7wm3s2](10.5061/dryad.47d7wm3s2) ## Description of the data and file structure These data sets were collected by multiple researchers conducting field work on freshwater turtles. They have been combined for this study. ### Files and variables #### File: full.data.csv **Description:** This contains the primary data used for most analyses. Each individual turtle was only included upon first capture. Therefore, no recaptures were included. These data have not been subset to populations with at least 50 individuals. See original paper (\"**Does a lack of juveniles indicate a threat? Understanding body size distributions in a group of long-lived vertebrates**\" [Journal of Animal Ecology]) for additional information. Throughout, NA indicates that the data point was not collected. ##### Variables * country.fox: Codes for country and whe...,本数据集涵盖38个物种、428个种群共41021只淡水龟的体型及/或性别数据。这些种群分布于存在入侵狐类与无入侵狐类的澳大利亚部分区域，以及美国本土种群——美国本土自然分布有浣熊（*Procyon lotor*）、狐类及其他巢捕食者。 本研究的核心目标为探究种群水平的体型分布规律，以建立“典型”淡水龟种群的基线基准，并检验相较于无入侵狐类的澳大利亚种群与自然暴露于巢捕食者的美国种群，受入侵狐类影响的种群是否存在幼体占比偏低的情况。此外，本研究还针对诱捕方法的偏差、样本量效应以及水体类型的影响开展了相关分析。本数据集由多位研究者的野外采集数据整合而成。 # 《幼体缺失是否预示生存威胁？探究长寿命脊椎动物类群的体型分布规律》 数据集DOI：[10.5061/dryad.47d7wm3s2](10.5061/dryad.47d7wm3s2) ## 数据与文件结构说明 本数据集由多位开展淡水龟野外研究的学者采集，并为本研究整合完成。 ### 文件与变量说明 #### 文件：full.data.csv **文件说明**：本文件为本研究多数分析所用的核心数据集。每只淡水龟仅以首次捕获的记录纳入数据集，因此未包含重捕个体。本数据集未筛选出至少包含50个个体的种群。更多详细信息请参阅原论文《幼体缺失是否预示生存威胁？探究长寿命脊椎动物类群的体型分布规律》（*Journal of Animal Ecology*）。 本数据集中所有字段中，`NA`表示该数据项未被采集。 ##### 变量说明 * `country.fox`：国家与（原文未完整表述）的编码……