Cylindrical Lioplax (Lioplax cyclostomaformis), Flat Pebblesnail (Lepyrium showalteri), Plicate Rocksnail (Leptoxis plicata), Painted Rocksnail (Leptoxis taeniata), Round Rocksnail (Leptoxis ampla), Lacy Elimia (Elima crenatella) 5-Year Review: Summary a

摘要

All six species have experienced significant curtailment of range and habitat. Deterioration of water and habitat quality through non-point source pollution continue to affect the surviving populations. Their limited distributions and small populations render the species vulnerable to random natural or human-induced events such as droughts or spills. The ranges of the cylindricallioplax and flat pebblesnail have been extended several miles in the Cahaba River. A small, new population of flat pebblesnail has been discovered surviving in the Little Cahaba River. The flat pebblesnail and plicate rocksnail have been successfully reared in a hatchery situation, and limited attempts have been made to reintroduce both species into historically occupied shoal habitats. Although there has been some progress in recovery efforts for the cylindrical lioplax, flat pebblesnail, and plicate rocksnail, these species remain vulnerable to habitat and water quality deterioration, and continue to meet the definition of endangered species under the Act. The lacy elimia, round rocksnail, and painted rocksnail, each continue to be known frOITI three distinct drainage populations, however, each is limited in extent and vulnerable to habitat and water quality deterioration. Therefore, they continue to meet the definition of threatened species under the Act.