Environmental variables measured in 624 lakes across Canada [2017-2019]

The file “LakePluse_env_624lakes.csv” contains environmental variables from 624 sampled as part of the NSERC Canadian Lake Pulse Network project over three summers (2017-2018-2019). Lake morphometry variables were either measured on site (lake depth), or obtained from HydroLAKES v. 1.0 (Messager et al. 2016). Water quality variables (water physical and chemical properties) were collected or measured at the deepest point of each lake, following the protocols from the NSERC Canadian Lake Pulse Network (2021). Watershed land use fractions were characterized for each lake, as described by Huot et al. (2019). Variables sampling depth and units are described in “metadata_variables.xlsx”. The file “fishTL_314lakes.csv" contains fish data in a subset of 314 lakes. Fish presence-data was collected as part of the FishHab project (fishab.weebly.com). Species trophic position were obtained using FishBase (https://www.fishbase.se/), and the highest trophic level was recorded for each lake (maxTL). Fish species were assigned a trophic position of piscivore (trophic level or TL > 3.5) or planktivore (TL ≤ 3.5) based on FishBase classification of known planktivore and piscivore species (adult stages). The total number of piscivore and planktivore taxa were then recorded for each lake. Lakes IDs with respective locations (longitude and latitude coordinates) and Continental Basin allocations can be found here: https://doi.org/10.5281/zenodo.4701262 References Huot, Y., C. A. Brown, G. Potvin, and others. 2019. The NSERC Canadian Lake Pulse Network: A national assessment of lake health providing science for water management in a changing climate. Sci. Total Environ. 695: 133668. doi:10.1016/j.scitotenv.2019.133668 Messager, M. L., B. Lehner, G. Grill, I. Nedeva, and O. Schmitt. 2016. Estimating the volume and age of water stored in global lakes using a geo-statistical approach. Nat. Commun. 7: 1–11. doi:10.1038/ncomms13603 NSERC Canadian Lake Pulse Network. 2021. NSERC Canadian Lake Pulse Network field manual 2017 - 2018 - 2019 surveys, M.-P. Varin, M.-L. Beaulieu, and Y. Huot [eds.]. Université de Sherbrooke.

"LakePluse_env_624lakes.csv"文件包含624个采样湖泊的环境变量，这些数据源自NSERC加拿大湖泊脉冲网络（NSERC Canadian Lake Pulse Network）项目在2017、2018、2019三个夏季开展的野外采样工作。湖泊形态学变量部分通过现场实测获取（如湖泊水深），其余数据取自HydroLAKES v.1.0（Messager等，2016）。水质变量（水体物理与化学属性）严格遵循NSERC加拿大湖泊脉冲网络（2021）的规范，在每个湖泊的最深点位采集或实测得到。各湖泊的流域土地利用占比参照Huot等（2019）的方法完成表征。变量的采样深度与单位详情可查阅"metadata_variables.xlsx"。

"fishTL_314lakes.csv"文件包含314个湖泊子集的鱼类数据。鱼类出现数据作为FishHab项目（fishab.weebly.com）的一部分完成采集。物种营养级通过FishBase（https://www.fishbase.se/）获取，同时记录每个湖泊内的最高营养级（maxTL）。根据FishBase对已知浮游食性与肉食性鱼类（成体阶段）的分类标准，将鱼类物种划分为肉食性类群（营养级TL>3.5）与浮游食性类群（TL≤3.5）。随后统计每个湖泊内肉食性与浮游食性类群的总数量。

包含湖泊ID、对应地理位置（经纬度坐标）及大陆流域归属的数据集可通过以下链接获取：https://doi.org/10.5281/zenodo.4701262

### 参考文献
1. Huot, Y., C. A. Brown, G. Potvin 等. 2019. NSERC加拿大湖泊脉冲网络：气候变化背景下支撑水资源管理的全国湖泊健康评估. 《科学总环境（Science of the Total Environment）》695: 133668. doi:10.1016/j.scitotenv.2019.133668
2. Messager, M. L., B. Lehner, G. Grill, I. Nedeva, O. Schmitt. 2016. 基于地统计方法估算全球湖泊蓄水体积与驻留时间. 《自然通讯（Nature Communications）》7: 1–11. doi:10.1038/ncomms13603
3. NSERC加拿大湖泊脉冲网络. 2021. NSERC加拿大湖泊脉冲网络2017-2018-2019野外调查手册, M.-P. Varin, M.-L. Beaulieu, Y. Huot [编]. 舍布鲁克大学.