ddRAD-seq alignment data for Unionid mussels

North American watersheds contain the world’s highest diversity of freshwater mussels (Unionoida), and up to 40 species can co-occur in a single riffle. They collectively exhibit little evidence for ecological differentiation during the long-lived, benthic phase of their life cycle.  In contrast, their brief parasitic larval phase involves the infection of a wide diversity of fish hosts. Gravid female mussels have evolved multiple methods for increasing the probability of infecting a host fish. Some species use a passive broadcast strategy: placing high numbers of larvae in the water column and relying on chance encounters with potential hosts for infection. Most species have a proactive strategy that entails the use of prey-mimetic lures to change the behavior of the hosts, i.e., eliciting a feeding response through which they become infected. Gravid females collectively produce two main lure types: a mantle tissue lure (on the female’s body) and a brood lure, containing infective larv...