ABSTRACT
In this chapter, we first briefly summarize what is known about the genetic variations of invasive species and how small-scale genotype interactions could be important for invasion dynamics. Second, we outline how different theories of coexistence that are typically applied at the species level can be applied at the genotype level and potentially serve as a means of evaluating invasion risk. Third, we use the invasive grass Phalaris arundinacea as a case study to explore how intraspecific feedbacks and/or neutral processes may structure diversity at the genotype level and influence invasion success.
