Populations of the freshwater amphipod Diporeia spp. have steadily declined in Lake Michigan since the late 1980’s. Prior studies have provided inconclusive data on possible reasons for their decline. However, some authors suggest that food competition and/or diseases associated with aquatic invasive species (AIS), such as zebra mussels (Dreissena polymorpha), may have caused the collapse of Diporeia. In this project, the possibility of pathogens as the cause of the collapse of Diporeia has been examined. Linear regression modeling show a significant positive linear association between percent of Diporeia exhibiting a pathogenic infection and year (r=0.7202264, p2 = 50, df = 10, pDiporeia. Future research is needed to examine other invasive species for similar pathogens, including live studies showing direct causality between zebra mussels and the decline in Diporeia.
Cave, Courtney S. and Strychar, Kevin, "Decline Of Diporeia in Lake Michigan: Was Disease Associated with Invasive Species the Primary Factor?" (2014). Funded Articles. 61.