Original caption: "Figure 3. Flux of nitrogen from ant colony to pitcher plant.
Bars indicate the change in <sup>15</sup>N abundance in the leaves of a <i>N. bicalcarata</i> plant two weeks after feeding a <sup>15</sup>N pulse to the symbiotic <i>C. schmitzi</i> colony. Leaf node 1 bears the youngest leaf. The pictogrammes under the graph explain the structure of the host plant, its ant colony and mark where tracer was fed."
Scharmann <i>et al.</i>
CC BY 2.5
Scharmann, M., D.G. Thornham, T.U. Grafe &amp; W. Federle (2013). A novel type of nutritional ant–plant interaction: ant partners of carnivorous pitcher plants prevent nutrient export by dipteran pitcher infauna. <i>PLoS ONE</i> <b>8</b>(5): e63556. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" class="extiw" title="w:Digital object identifier">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1371%2Fjournal.pone.0063556">10.1371/journal.pone.0063556</a>