Table 2: Summary of hypotheses that fall under an enemy framework and how they can be encompassed by process and ecological context. The proposed explanations are examples only; e.g. a high relatedness to native species could mean an exotic is more vulnerable to enemies (because it is a more familiar target for enemies in the invaded range), or less vulnerable to enemies (because it likely possesses defences that will be effective against enemies in the invaded range). Our goal is not to suggest which hypotheses are more or less likely overall, but to highlight the conditions that could lead to each one and demonstrate how considering a core set of factors and contexts can unify the hypotheses into a single tractable framework. List and summary of hypotheses is from Catfordet al. 2009 and references therein.