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)