Bamstedt, U. & A. Ervik. 1984.  Local variations in size and activity among
     Calanus finmarchicus and Metridia longa (Copepoda, Calanoida)
     overwintering on the west coast of Norway. Journal of Plankton Research,
     6(5): 843-857.

Spatial Coverage:  North Atlantic
Temporal Covereage:  Nov. 21-26, 1980
Language:  English

Abstract:  Vertical net hauls were taken at thirteen stations between latitude
     60 degrees 8 minutes N - 61 degrees 20 minutes N and longitude 3 degrees
     4 minutes E - 7 degrees 0 minutes E in late November 1980.  Size and
     activity characteristics of Calanus finmarchicus and Metridia longa were
     studied.  Significant differences were noted between C. finmarchicus from
     different stations.  Average body length, dry weight, protein and lipid
     contents, gonad development, and amylase and trypsin activities varied but
     average gut fullness and trypsin/amylase ratio appeared constant.  M.
     longa from different stations showed significant differences in average
     body length, dry weight, protein content, anylase adn trypsin activities
     and gut fullness, but there were no apparent variations in lipid content
     and trypsin/amylase ratio.  Those animals inhabiting the most seaward
     station tended to show the most specific local characteristics.  M. longa
     had consistently lower lipid proportion with higher gut fullness and
     digestive-enzyme activites than C. finmarchicus.  The results therefore
     indicate that C. finmarchicus had assumed a winter state of low activity
     with dependence on stored energy, while M. longa relied more upon
     utilization of available food.