Fig. 3.

Global riverine fish catch relative to a biodiversity threat index at three spatial scales: grid cells, ecoregions, and river basins. Lines show cumulative proportion of total catch as threat levels increase. The threat index accounts for physical, chemical, and biological alteration of rivers and their watersheds, and is modified from ref. 4 by excluding fishing pressure. The Inset illustrates the cumulative distribution of global catch across ecoregions and rivers in rank order.