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Net photosynthetic rate (AN) in three carnivorous species in relation to leaf nitrogen content. Regression lines (solid line, N. alata lamina; dashed line, S. psittacina; dotted line, D. capensis) are shown only for significant relationships. The lines have similar slopes (P = 0·083) but D. capensis has different y-intercept (P < 0·001) according to ANCOVA at P = 0·05.
