Sensitivity to climate change
Inland redband trout are likely sensitive to increasing water temperatures and altered flow regimes. While redband trout can persist in desert streams that often exceed 20˚C through what appears to be local physiological adaptation, increased water temperatures pose a threat to this species because though their thermal optima is higher than other salmonids, their thermal maxima is similar. Further, warming temperatures may lead to increased nonnative species invasion or competition with native “cool water” fishes such as cyprinids and catostomidae. Inland redband trout spawn in the spring, thus their embryos and recently emerged fry may be sensitive to changes in the timing and magnitude of spring runoff. Lower summer flows may decrease habitat volume and access to headwater reaches for this species. Inland redband trout exhibit broad phenotypic (e.g., age-at-maturity, frequency and timing of spawning, temperature tolerance, etc.) and life history diversity, which may decrease overall sensitivity of this species.
Exposure to climate change
- Increased water temperatures
- Altered timing/magnitude of spring runoff
- Lower summer flows