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GEO Year Book 2003  
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Cascading through the environment

Global distribution of oxygen-depleted coastal zones. The 146 zones shown are associated with either majorpopulation 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 irregularintervals 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


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