Task 1.4: Determination of changes in stock distributions and migrations

The available data will be used to generate descriptions of the seasonal and inter-annual variation in distribution and migration of the target species and how these relate to distribution of physical variables such as temperature, salinity, and currents, biological variables such as predators, prey and competitors, and fishing. Various hypotheses will be investigated on the relative roles of the state of the population and environmental influence on distribution and migration in light of fish behaviour in different life phases.  The spatial distributions of the fish will be statistically analysed to provide potential and realised habitats. Internal population parameters versus external environmental forcing will thus be ranked in each case study as being most influential in changing population spatial patterns and habitat occupation. The final stages will consist of modelling the impact of collapse on the migration and distribution of populations and the potentials for recovery. The specific areas of investigation are:

  1. Variability in distributions and migration patterns;
  2. Resolution of factors driving migrations and distribution;
  3. Modelling of optimal or realised habitats;
  4. Assessing the risk for collapse and likelihood of recovery due to different spatial patterns.