Extended Data Fig. 7: Measurements of excess 15N%, χ, in three untreated control ponds.
From: Warming impairs trophic transfer efficiency in a long-term field experiment
Green circles represent phytoplankton (n = 5 per pond), whereas brown squares represent zooplankton (n = 3–5 per pond). These results are expected given that no 15N tracer was added. The y axis was kept fixed in order to compare the magnitude of change between treatments (Extended Data Fig. 5) and controls. For further explanations of how the data were collected, see Methods.
