Assumptions
• Nutrient source: from across the northern flank;
• Some (most?) is taken up by phytoplankton in the
front, and around the periphery;
• Primary production patterns are thus predictable
(or are they?)
Questions
•   What are the patterns of upper trophic level
   responces?
•   What are the above relationships with fish
   spawning and production?
•   What is the importance of winter?  (e.g., see data
   from Pastuszak et al., 1981)