caa a22 4500 606227091 CHVBK 20210128101156.0 cr unu---uuuuu 210128e20150601xx s 000 0 eng 10.1007/s10641-015-0383-7 doi (NATIONALLICENCE)springer-10.1007/s10641-015-0383-7 Predicting juvenile Chinook Salmon routing in riverine and tidal channels of a freshwater estuary [Elektronische Daten] [Bradley Cavallo, Phil Gaskill, Jenny Melgo, Steven Zeug] As juvenile salmonids migrate from natal streams to the ocean they can encounter junctions leading to migration routes that differ in quality and survival probability, including: side channels, agricultural diversions, floodplains, cooling intakes and turbines. Although juvenile salmon are known to use all these routes, it is often difficult to estimate what proportion of migrants may use each. Managers would benefit from knowledge of how hydrologic manipulation (e.g., dam releases, water diversions) can reduce exposure to unfavorable routes and keep more fish in higher survival routes. We assembled 41 estimates of juvenile salmon routing at six junctions in the Sacramento-San Joaquin Delta to test the ability of three hydrologic metrics to predict fish routing at distributary channels. The proportion of flow entering the distributary was selected as the best predictor and explained 70% of observed variation in fish routing. This linear model was then used to predict routing at nine junctions under various combinations of inflow and exports. Our results suggest that more fish enter distributaries at junctions with strong riverine influence, whereas at tidally dominated junctions entrainment was lower. River inflow had the largest effect on entrainment at the two riverine-dominated junctions, although confidence intervals overlapped over the range of flows. Exports had a smaller than expected effect, but had the greatest effect at junctions directly connected to the channels with water diversions. These results suggest that flow proportion is an effective metric to predict fish routing. However, results also suggest it may be difficult to appreciably alter fish routing by manipulating river inflows or water diversions. Springer Science+Business Media Dordrecht, 2015 Hydrodynamics nationallicence Flow nationallicence Routing nationallicence Salmon nationallicence Sacramento-San Joaquin Delta nationallicence Estuary nationallicence Tides nationallicence Behavior nationallicence Water diversions nationallicence Cavallo Bradley Cramer Fish Sciences, 13300 New Airport Road Suite 102, 95602, Auburn, CA, USA aut Gaskill Phil Cramer Fish Sciences, 600 NW Fariss Road, 97030, Gresham, OR, USA aut Melgo Jenny Cramer Fish Sciences, 13300 New Airport Road Suite 102, 95602, Auburn, CA, USA aut Zeug Steven Cramer Fish Sciences, 13300 New Airport Road Suite 102, 95602, Auburn, CA, USA aut Environmental Biology of Fishes Springer Netherlands 98/6(2015-06-01), 1571-1582 0378-1909 98:6<1571 2015 98 10641 https://doi.org/10.1007/s10641-015-0383-7 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10641-015-0383-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Cavallo Bradley Cramer Fish Sciences, 13300 New Airport Road Suite 102, 95602, Auburn, CA, USA aut NATIONALLICENCE 700 1- Gaskill Phil Cramer Fish Sciences, 600 NW Fariss Road, 97030, Gresham, OR, USA aut NATIONALLICENCE 700 1- Melgo Jenny Cramer Fish Sciences, 13300 New Airport Road Suite 102, 95602, Auburn, CA, USA aut NATIONALLICENCE 700 1- Zeug Steven Cramer Fish Sciences, 13300 New Airport Road Suite 102, 95602, Auburn, CA, USA aut NATIONALLICENCE 773 0- Environmental Biology of Fishes Springer Netherlands 98/6(2015-06-01), 1571-1582 0378-1909 98:6<1571 2015 98 10641