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Coastal wetlands provide critical habitat for aquatic organisms and important ecosystem services for the terrestrial and aquatic landscapes they bridge, but increasingly common invasive macrophytes disrupt plant communities, food webs, habitat structure and littoral-pelagic linkages. In Laurentian Great Lakes coastal wetlands, invasive cattails ( Typha × glauca and T. angustifolia , hereafter Typha ) homogenize ecosystem structure and reduce nearshore dissolved oxygen, and plant, fish, and macroinvertebrate diversity. We hypothesize that management treatments that reduce Typha and its abundant litter promote structural heterogeneity and mitigate physiochemical and biodiversity impacts. To test this hypothesis, we implemented a large-scale (2048 m 2 treatment units), multi-site (four coastal wetlands) experiment in northern Michigan (USA) to examine how invasive Typha mechanical harvesting treatments (biomass harvest, aquatic connectivity channels, Typha-dominated control) altered fish, macroinvertebrate, plant, larval amphibian abundance and diversity, and water quality for two-years post-treatment. We collected fish, macroinvertebrates, plant, larval amphibian, and water quality data from for two years following the implementation of management treatments. These data are presented in this archived dataset. ; Data is saved in Excel file (.xlsx) format and can be opened with Microsoft Excel or Google Sheets. Funding provided by: Environmental Protection Agency Crossref Funder Registry ID: https://ror.org/03tns0030 Award Number: Grant # GL00E01925 ; Study sites We selected four Great Lakes coastal wetland complexes in northern Michigan (USA) for our study, one in the northern Lower Peninsula and three in the eastern Upper Peninsula. Two of the wetlands (Cheboygan Marsh and St. Ignace Marsh) are in the Straits of Mackinac, near the confluence of Lakes Michigan and Huron, and two (Munuscong Marsh and Sand Island Marsh) are in the St. Marys River, the connecting channel between Lakes Superior and Huron (Figure 1). ... |