Area Occupied Justification:
Klamath largescale suckers in California have restricted distribution within the Lost River-Clear Lake and Klamath River. They may be already absent from the state (Moyle 2002).
Pop Size Justification:
Abundance estimates in California were not found but populations are likely small.
Intervention Dependence Score:
Intervention Dependence Justification:
Persistence or re-establishment will require intervention
Based on habitat use, Klamath largescale suckers prefer habitats with high water quality. However, they can withstand high temperatures and pH, and low dissolved oxygen concentrations for short periods of time.
Genetic Risk Justification:
Dams isolate populations from one another and hybridization with shortnose suckers can influence genetic diversity.
Climate Change Justification:
Flows in the Lost and Klamath Rivers will likely be impacted by climate change.
Very little information is available on the abundance and ecology of Klamath largescale suckers, especially in California.