Figure 4. Annual total numbers of Chrysaora quinquecirrha
scyphomedusae counted daily from a pier in mesohaline
Chesapeake Bay versus the North Atlantic Oscillation
(NAO) Index during 1960–1995. Filled circles represent
years prior to the climate regime shift that followed
Hurricane Agnes in 1972 (from Purcell & Decker, 2005).
Copyright (2005) by the American Society of Limnology
and Oceanography, Inc.