FRESHWATER MUSSELS (BIVALVIA: UNIONIDAE) FROM THE FALSE RIVER, POINTE COUPEE PARISH, LOUISIANA.

North America is home to some of the most diverse freshwater mussel fauna (Mollusca: Unionidae) in the world, with the majority of mussel diversity located in the southeastern United States. Unfortunately, mussels are one of most imperiled groups in the world and species are declining across the United States. Anthropogenic habitats may function as refugia for some mussel species; however, many of these habitats are ignored during studies. The False River of Louisiana is a unique system that has separated from the Mississippi River and is dependent on an artificial canal system to maintain water levels. The canal may act as refugia for mussels during climatic events, but it is unknown whether the system can sustain mussels. To obtain an understanding of the structure and health of mussels within this anthropogenic structure, we surveyed mussels and fish at 11 sites in a section of artificial canal connected to the False River. We analyzed the mussel assemblage with regard to life history strategies and compared fish presence to known fish host use of our various mussel species. We collected 388 individuals of 13 live mussel species, with 5 additional species located as shell material. The fish assemblage consisted of 22 species of which 15 were hosts for at least one member of the mussel assemblage. The mussel assemblage primarily consisted of opportunistic species and host generalists with a few dominant species. This is, to our knowledge, the first mussel peer-reviewed mussel data reported from any portion of the False River system and the mussel assemblage appears to follow predictable trends for flashy systems noted in other rivers. Our study highlights that the False River canal system is capable of sustaining mussels and indicates that anthropogenic structures should be incorporated into future survey efforts. [ABSTRACT FROM AUTHOR]