Interagency Ecological Program: Monitoring of water quality, phytoplankton, zooplankton, clams, and Delta Smelt to support the Summer-Fall Suisun Marsh Salinity Control Gates Action 2018-2024

The Suisun Marsh Salinity Control Gates (SMSCG) have the potential to increase low-salinity-zone habitat for endangered Delta Smelt (Hypomesus transpacificus, California Endangered Species Act listed as Endangered, Federal Endangered Species Act listed as Threatened), and to allow them to more frequently occupy Suisun Marsh, especially Montezuma Slough, one of their most important rearing habitats. Operation of the SMSCG in summer and fall to improve Delta Smelt habitat are called for in the Biological Opinion and Incidental Take permit for the Central Valley Project and State Water Project. To support the adaptive management of the action, the California Department of Water Resources and collaborating agencies monitored water quality, phytoplankton, zooplankton, clams, and fishes during the SMSCG management actions in 2018. Monitoring has continued during the summer and fall months of all subsequent years, including both those with and without actions. This data package includes data collected by the Interagency Ecological Program’s (IEP) long-term monitoring programs supplemented with targeted sample collection where existing surveys lacked spatial or temporal coverage. Monitoring during no-action years will be used as a baseline for comparison during action years. This data package will be updated annually.萨克拉门托-圣华金三角洲苏森沼泽盐度控制闸门（Suisun Marsh Salinity Control Gates, SMSCG）具备为濒危的三角洲胡瓜鱼（Delta Smelt，学名*Hypomesus transpacificus*，根据《加州濒危物种法》列为濒危物种、《联邦濒危物种法》列为受威胁物种）增加低盐生境的潜力，并使其能够更频繁地栖息于苏森沼泽，尤其是其核心育幼栖息地之一的蒙特苏马水道（Montezuma Slough）。针对中央河谷工程（Central Valley Project）与州水利工程（State Water Project）的生物意见书（Biological Opinion）及附带捕捞许可（Incidental Take Permit）中，明确要求在夏季与秋季运行SMSCG以改善三角洲胡瓜鱼的栖息环境。为支撑该措施的适应性管理工作，加州水资源部（California Department of Water Resources）及其合作机构于2018年SMSCG管理行动期间，对水质、浮游植物、浮游动物、双壳类动物及鱼类开展了监测。后续所有年份的夏季与秋季均持续开展监测，覆盖实施管理措施与未实施管理措施的两类年份。本数据集包含跨机构生态项目（Interagency Ecological Program, IEP）长期监测项目所采集的数据，并针对现有调查在时空覆盖上存在缺口的区域补充了针对性采样数据。未实施管理措施年份的监测数据将作为基准，用于与实施管理措施年份的监测结果开展对比分析。本数据集将按年度进行更新。