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Global distribution of oxygen-depleted coastal zones
Global distribution of oxygen-depleted coastal zones. The 146 zones shown are associated with either major population concentrations or with watersheds that deliver large quantities of nutrients to coastal waters. (Annual yearly events related to summer or autumnal stratification; Episodic events occurring at irregular intervals greater than one year; Periodic events occurring at regular intervals shorter than one year; Persistent all-year-round hypoxia)
Sources: Boesch 2002, Caddy 2000, Diaz and others (in press), Green and Short 2003, Rabalais 2002