Results from Spearman’s rank tests of association (across all years) between the number of days water depths increased at individual study wetlands within years and the number of days when precipitation was recorded at the nearest weather station during the same time period.

Tam, SC, NTL, and UMR = the Tamarac National Wildlife Refuge, St. Croix National Scenic Riverway, the North Temperate Lakes Long-term Ecological Research site, and Upper Mississippi River, respectively.

Tam、SC、NTL与UMR分别指代塔玛拉克国家野生动物保护区（Tamarac National Wildlife Refuge）、圣克罗伊国家风景河道（St. Croix National Scenic Riverway）、北温带湖泊长期生态研究站点（North Temperate Lakes Long-term Ecological Research site）以及上密西西比河（Upper Mississippi River）。