Figure 2
From: Tipping point arises earlier under a multiple-stressor scenario
Stressor interactions along a nutrient enrichment gradient for mean mortality in the zebra mussel Dreissena polymorpha after two months. The Rescaled Deviation from Additivity metric shows the interaction types and magnitude between saltwater intrusion and nutrient enrichment at different concentrations. Grey bars represent additive responses, red bars represent synergies (greater than the null-hypothesis of no-interaction) and blue bars represent antagonistic interactions (weaker than the null-hypothesis of no-interaction). Values range from − 1 to 2 where − 1 indicates an extremely synergistic interaction and 2 an extremely antagonistic interaction. Values ranging from − 0.5 to 0.5 indicate additive responses.
