Assessing the success of conservation efforts for a North American topminnow at risk of extinction from spatially variable mosquitofish invasions

Invasive species can cause population declines and extinctions of native species through several mechanisms including predation and competition. One such species, western mosquitofish ( Gambusia affinis ), is an invasive, aggressive predator and competitor of numerous freshwater species around the world that has caused precipitous declines of native species. The Barrens topminnow ( Fundulus julisia ) is a spring‐endemic fish of the south‐eastern...