Tidal wetland restoration is commonly used to recover ecosystem functions and services that were lost when wetlands were diked for reclamation or management. Less research has been conducted on the response of invertebrate and fish assemblages to tidal restoration than on plants and physical attributes. Blacklock Marsh, a wetland in Suisun Marsh, USA, was once managed for waterfowl hunting and cattle grazing until its dike was breached, restoring full tidal action. We sampled water quality, zooplankton, macroinvertebrates, and fishes in Blacklock Marsh, and compared these metrics to adjacent naturalistic waterways and to a managed wetland focused on waterfowl. Our goal was to compare food production and community assemblage on a restoring marsh to other types of nearby waterways. Blacklock Marsh had less chlorophyll-a and dissolved organic carbon than nearby dead-end sloughs and the managed wetland, less zooplankton biomass than the managed wetland, and lower fish diversity—with a fish assemblage dominated by non-native species—compared to all other waterways. The most abundant fish species in the restoring site, Mississippi silverside (Menidia audens), is a non-native fish and known predator of Delta smelt larvae (Hypomesus transpacificus), for which the restoration was targeted. Our research suggests that restoring tidal action to managed wetlands alone may worsen rather than improve conditions for at-risk and native fishes.

中文翻译：

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加利福尼亚管理湿地的潮汐恢复有利于非本地鱼类

潮汐湿地恢复通常用于恢复因围垦或管理湿地而丧失的生态系统功能和服务。与植物和物理属性相比，对无脊椎动物和鱼类组合对潮汐恢复的响应的研究较少。Blacklock Marsh 是美国 Suisun Marsh 的一块湿地，曾被管理用于猎杀水禽和放牧，直到堤坝被破坏，恢复了全面的潮汐作用。我们对 Blacklock Marsh 的水质、浮游动物、大型无脊椎动物和鱼类进行了采样，并将这些指标与邻近的自然水道和以水禽为重点的管理湿地进行了比较。我们的目标是将恢复沼泽的食物生产和社区组合与附近其他类型的水道进行比较。布莱克洛克沼泽有叶绿素少一个和溶解的有机碳比附近的死胡同和受管理的湿地相比，浮游动物生物量比受管理的湿地少，鱼类多样性较低——与所有其他水道相比，鱼类组合以非本地物种为主。恢复地点中最丰富的鱼类物种是密西西比银鱼 ( Menidia audens )，是一种非本地鱼类，是三角洲胡鱼幼虫 ( Hypomesus transpacificus ) 的已知捕食者，修复目标是该鱼类。我们的研究表明，仅对受管理的湿地恢复潮汐作用可能会恶化而不是改善处于危险中的和本地鱼类的条件。