Fig. 6.

Total amount of newly assimilated nitrogen (mg) from combined host and symbiont tissues. Solid black line shows significant relationship as determined by generalized linear models, with p-values. To visualize the significant interaction between symbiont density and symbiont ratio, data for symbiont ratios are plotted independently for levels of nonsignificant, < 1:1, mostly B. minutum (triangles and dashed lines), and significant > 1:1, mostly S. microadriaticum (circles and solid line) effects