Secondary Production

Abstract

For calanoid and cyclopoid copepods and for Chaoborus the production of each developmental stage was computed separately as follows (Edmondson, 1971; Winberg, 1971):

$$ {P_{i}} = \frac{{{N_{i}}\Delta {w_{i}}}}{{{D_{i}}}} $$

where P _i is the production of stage i, N _i is the numerical abundance of stage i, Δw _i is the change in weight over stage i, and D _i is the development time for stage i. The values of D _i were obtained from the cohort analysis, which has already been discussed. The values of P _i were summed as required to obtain the production of groups of developmental stages or of the entire population.