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
