Climate change and increasing water demand are critical factors influencing water availability and the hydrologic cycle. This study examines their combined impacts on the Kaskaskia River watershed in Illinois, USA, using a comprehensive hydrologic modeling approach. The model integrates key watershed components, including existing reservoirs, multiple water withdrawal sources, and point source discharges, with necessary modifi...

High-head dams are migration barriers for Pacific salmon Oncorhynchus spp. in many river systems and recovery measures for impacted stocks are limited. Trap-and-haul has been widely used in attempts to facilitate recovery but information from existing programs has not been synthesized to inform improvements to aid recovery of salmonids in systems with high-head dams. We reviewed 17 trap-and-haul programs regarding Pacific salm...

High rates of dispersal can breakdown coadapted gene complexes. However, concentrated genomic architecture (i.e., genomic islands of divergence) can suppress recombination to allow evolution of local adaptations despite high gene flow. Pacific lamprey ( Entosphenus tridentatus ) is a highly dispersive anadromous fish. Observed trait diversity and evidence for genetic basis of traits suggests it may be locally adapted. We addre...

Adult steelhead Oncorhynchus mykiss tagged with archival transmitters primarily migrated through a large river corridor at depths >2 m interspersed with frequent but short ( Oncorhynchus tshawytscha study, except O. mykiss experienced greater seasonal variability and were more likely to have depth uncompensated supersaturation exposure in some dam tailraces, perhaps explaining the higher incidence of GBD in this species.

Two non‐direct homing behaviours, overshoot of natal tributaries and temporary non‐natal tributary use, were evaluated for 5150 radio‐tagged spring–summer Chinook salmon Oncorhynchus tshawytscha from 40 populations in the large Columbia River system. Over 7 years, 2–44% (mean = 15%) of individuals within each group temporarily entered presumed non‐natal tributaries. In addition, many Chinook salmon from lower river tributaries...

Unusually long downstream movements totalling several hundred kilometres to >1100 km were observed during upstream homing migrations of radio‐tagged spring chinook salmon Oncorhynchus tshawytscha in the Columbia and Snake Rivers, U.S.A. Downstream migrants, identified by their repeated ascension and fallback over a series of large hydroelectric dams within the migration corridor, were primarily hatchery‐origin males.

Upstream migration rates were assessed for 1801 radio‐tagged adult spring–summer Chinook salmon Oncorhynchus tshawytscha through 12 unimpounded river reaches in the Columbia River basin from 1997 to 2002. Reaches were 36 to 241 km long (mean = 130 km) and included sections of the large Columbia and Snake Rivers and smaller free‐flowing tributaries. Median Chinook salmon migration rates ranged from −1 in the Deschutes and Clear...

It cannot honestly be stated that digital imagery is a standard instrument in the repertoire of the professional natural resource manager. However, we believe that the opportunity to change that situation is rapidly approaching because a nexus of technology and need has finally occurred. However, pragmatic issues remain. The key to the successful adoption of any new tool, including digital imagery, is not just having the need,...