Figure Box 6.1
The relative importance of different threatening processes facing North American marine fishes (taken from Musick et al. 2000b), and having caused extinctions among freshwater fishes globally (taken from Harrison and Stiassny 1999). The data are expressed as percentages of species in each sample affected by a particular threat (sample size is 82 species for North American marine fishes, and 164 species for extinct or probably extinct freshwater fishes). In the freshwater graph, individual species have often been coded against more than one threat.