Fig. 4. Partial effects of edible phytoplankton fraction, seston C:P ratio, specific production rate, and fish abundance on H/P mass ratio.

Partial regression leverage plots showing relationships between H/P mass ratio (the response variables), and log-transformed C:P ratio of seston (a), fraction of edible algae (b), specific daily production (c), and relative fish abundance (d) (the explanatory variables) without interfering effects from other explanatory variables. The vertical axis represents the partial residuals of H/P mass ratio, and the horizontal axis represents the partial residual of the specific explanatory variable. Dashed and dotted lines in each panel represent the partial regression line and its 95% confidence curves. Partial correlation coefficients with p values are also inserted in each panel. Data from four different treatments of pond 217 (circles) and 218 (squares) are denoted by different colors.