Climate change and annual fluctuations of environmental conditions strongly affect fish stocks and all biological ecosystem components. Evaluating fisheries management strategies should include environmental information as part of the decision basis. Estimation of how often an undesirable event may occur, and what the consequences would be of such an event needs to be estimated through a risk analysis using stochastic simulations.
Common trends refer to trends that are similar across ecosystem components. Identifying common trends can be useful as a diagnostic tool to reveal past changes and to explore the relationships among biological communities and between these communities and environmental conditions.