Dissolved oxygen indices (mean ± SE) from six sampling stations in each of a subset of 19 subestuaries where percent cropland or IDW development covered >15 percent of the surrounding watershed in Chesapeake Bay, USA.

*IDW development is the percent urban development in the watershed weighted by its squared inverse distance from the shoreline.

反距离加权开发量（IDW development）指以各区域到岸线的平方反比距离作为权重，对流域内城镇开发占比进行加权计算所得的指标。