Bycatch is the principal threat to at-risk marine vertebrates.
figureposted on 2008-06-18, 02:35 authored by Myra Finkelstein, Victoria Bakker, Daniel F. Doak, Ben Sullivan, Rebecca Lewison, William H. Satterthwaite, Peter B. McIntyre, Shaye Wolf, David Priddel, Jennifer M. Arnold, Robert W. Henry, Paul Sievert, John Croxall
Total number of species of cetaceans, sharks, sea turtles, and seabirds in the IUCN red list database (http://www.iucnredlist.org/) affected by the following threat categories: NNS = invasive non-native species; Habitat = habitat destruction and degradation; Harvest = harvesting; Bycatch = accidental mortality from fisheries bycatch; Pollution = pollution (land and water); Climate = pollution relating to the atmosphere and climate change; Disturb = human disturbance, persecution, noise pollution, and collisions (from Doak et al. ). Although not listed as a primary threat in the IUCN database, non-native species are also known to impact sea turtles on their breeding grounds .