Table 1.
Effects of climate-induced changes in hydrologic connectivity on native fish species in the VRB according to estimated median annual dispersal distance of mobile fishes in the population
| Species | Median annual dispersal, km | Overall DCI | Percent reduction in DCI | ||||
| Current | Future | Overall | Spawning | Monsoon | Winter | ||
| Poeciliopsis occidentalis, Gila topminnow | 0.5 | 57 | 54 (52) | 7 (10) | 14 (21) | 5 (7) | 2 (3) |
| Agosia chrysogaster, longfin dace | 1.0 | 57 | 54 (52) | 7 (10) | 14 (21) | 5 (7) | 2 (3) |
| Meda fulgida, spikedace | 1.0 | 57 | 54 (52) | 7 (10) | 14 (21) | 5 (7) | 2 (3) |
| Rhinichthys osculus, speckled dace | 1.3 | 57 | 54 (52) | 7 (10) | 14 (21) | 5 (7) | 2 (3) |
| Catostomus clarki, desert sucker | 5.7 | 73 | 69 (68) | 6 (9) | 12 (18) | 5 (8) | 2 (2) |
| Gila robusta, roundtail chub | 10.9 | 79 | 76 (74) | 5 (7) | 10 (15) | 4 (6) | 2 (2) |
| Catostomus insignis, Sonora sucker | 29.4 | 82 | 79 (78) | 4 (6) | 7 (12) | 4 (5) | 1 (1) |
Overall DCI future values represent the midcentury simulation period. Percent reduction [calculated as (DCIfuture − DCIcurrent)/DCIcurrent × 100] in mean daily DCI values between current and midcentury simulation periods is reported for the entire year (overall) and seasonally according to estimated fish species’ dispersal distance. Late century (time period) values for overall DCI and percent change in DCI are reported in parentheses. All percent change values represent a decrease in connectivity for both future simulation periods and therefore are reported as percent reduction.