The significance of past interdrainage connectivity for studies of diversity, distribution and movement of freshwater‐limited taxa within a catchment
Historical connectivity between drainages may represent an underappreciated contributor to the biodiversity within a catchment. First, we tested whether an isolated population of freshwater‐limited galaxiids represents a contribution by past interdrainage connectivity to this
system's biodiversity, rather than reflecting intracatchment dispersal or speciation. Second, we sought to distinguish between possible geomorphic processes that could have allowed any past connectivity.