FIGURE 3. Schematic representation of the effects of some environmental variation on an unexploited, exploited but protected, and exploited but unprotected fish population.
From the following article:
Towards sustainability in world fisheries
Daniel Pauly, Villy Christensen, Sylvie Guénette, Tony J. Pitcher, U. Rashid Sumaila, Carl J. Walters, R. Watson and Dirk Zeller
Nature 418, 689-695(8 August 2002)
doi:10.1038/nature01017
This illustrates how protection through a marine reserve (and/or stock rebuilding) can mitigate the effects of environmental fluctuations, including 'regime shifts'49. (Graph from J. Jackson, personal communication.)