Spatially-explicit bioenergetics of Pacific sardine in the Southern California Bight: are mesoscale eddies areas of exceptional prerecruit production?

Previous research shows that offshore mesoscale eddies in the Southern Cali fornia Bight region are areas where sardine larval abundance is significant ly increased relative to inshore, slope and surrounding offshore waters. In order for mesoscale eddies to be a mechanism linking climate and sardine p opulation variability they must be areas of exceptional prerecruit producti on. Temperature and prey data from various Southern California Bight (SCB) habitats, including offshore eddies, were applied to a spatially-explicit b ioenergetic model which predicts sardine prerecruit growth potential. Growt h potential was similar in inshore, slope, and eddy regions (11% and 12% da y(-1)), and was lower in the offshore region, 9% day(-1). To estimate produ ction in eddy and non-eddy habitats, growth potential was multiplied by hab itat-specific estimates of sardine larval biomass from at-sea surveys. A pr oduction index, a measure of potential production resulting from individual growth rate potential and local abundance, was greater in the model cyclon ic eddy than in all other regions by more than an order of magnitude. In fa ct, the production index in the eddy was four times greater than in all oth er regions combined. (C) 2001 Elsevier Science Ltd. All rights reserved.