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It is important for fishery scientists and ecosystem-based fishery managers to recognize that there may be apparent persistence in an ecosystem followed by ecosystem changes corresponding to different ecological states and different levels of fisheries output; revenues paid to California fishers have varied more than fivefold in inflation adjusted dollars during the 75-year period of our study. Empirical...
Comparisons of variation in physical, biological and economic indicators from 1877 to 2004 indicate that events in the physical ocean environment off California can be traced through the ecosystem to the commercial fishers’ economic environment. The annual landed weight of 29 commercial fish and invertebrate species, with various life histories and trophic associations, were used in an empirical orthogonal...
In previous work, we show that accumulated anomalies of physical indices are proportional to California sardine landings and that the accumulated anomaly curves change the sign of their slope, showing maxima (minima) when climate is favorable (unfavorable) to successful completion of the sardine life cycle change. Here, we find unique time series characteristics of the periods when the climate changed...
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