Estimating Coho Salmon Rearing Habitat and Smolt Production Losses in a Large River Basin, and Implications for Habitat Restoration

There is considerable uncertainty about the effectiveness of fish habitat restoration programs, and reliable monitoring programs are needed to evaluate them. Statistical power analysis based on traditional hypothesis tests are usually used for monitoring program design, but here we argue that effect size estimates and their associated confidence intervals are more informative because results can be compared with both the null hypothesis of no effect and effect sizes of interest, such as restoration goals. We used a stochastic simulation model to compare alternative monitoring strategies for a habitat alteration that would change the productivity and capacity of a coho salmon (Oncorhynchus kisutch) producing stream. Estimates of the effect size using a freshwater stockrecruit model were more precise than those from monitoring the abundance of either spawners or smolts. Less than ideal monitoring programs can produce ambiguous results, which are cases in which the confidence interval includes both the null hypothesis and the effect size of interest. Our model is a useful planning tool because it allows the evaluation of the utility of different types of monitoring data, which should stimulate discussion on how the results will ultimately inform decision-making.

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Distributed model of hydrological and sediment transport processes in large river basins in Southeast Asia

Hydrology and Earth System Sciences Discussions ◽

10.5194/hessd-12-6755-2015 ◽

2015 ◽

Vol 12 (7) ◽

pp. 6755-6797 ◽

Cited By ~ 4

Author(s):

S. Zuliziana ◽

K. Tanuma ◽

C. Yoshimura ◽

O. C. Saavedra

Keyword(s):

Sediment Transport ◽

Suspended Sediment ◽

River Basin ◽

River Basins ◽

Large River ◽

Mekong River ◽

Distributed Model ◽

Mekong River Basin ◽

Chao Phraya River ◽

Large River Basins

Abstract. Soil erosion and sediment transport have been modeled at several spatial and temporal scales, yet few models have been reported for large river basins (e.g., drainage areas > 100 000 km2). In this study, we propose a process-based distributed model for assessment of sediment transport at a large basin scale. A distributed hydrological model was coupled with a process-based distributed sediment transport model describing soil erosion and sedimentary processes at hillslope units and channels. The model was tested on two large river basins: the Chao Phraya River Basin (drainage area: 160 000 km2) and the Mekong River Basin (795 000 km2). The simulation over 10 years showed good agreement with the observed suspended sediment load in both basins. The average Nash–Sutcliffe efficiency (NSE) and average correlation coefficient (r) between the simulated and observed suspended sediment loads were 0.62 and 0.61, respectively, in the Chao Phraya River Basin except the lowland section. In the Mekong River Basin, the overall average NSE and r were 0.60 and 0.78, respectively. Sensitivity analysis indicated that suspended sediment load is sensitive to detachability by raindrop (k) in the Chao Phraya River Basin and to soil detachability over land (Kf) in the Mekong River Basin. Overall, the results suggest that the present model can be used to understand and simulate erosion and sediment transport in large river basins.

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Behavior patterns and fates of adult steelhead, Chinook salmon, and coho salmon released into the upper Cowlitz River Basin, 2005–09 and 2012, Washington

Open-File Report ◽

10.3133/ofr20161144 ◽

2016 ◽

Cited By ~ 1

Author(s):

Tobias J. Kock ◽

Brian K. Ekstrom ◽

Theresa L. Liedtke ◽

John D. Serl ◽

Mike Kohn

Keyword(s):

River Basin ◽

Chinook Salmon ◽

Coho Salmon ◽

Behavior Patterns

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Instream Habitat Restoration and Stream Temperature Reduction in a Whirling Disease-Positive Spring Creek in the Blackfoot River Basin, Montana

Transactions of the American Fisheries Society ◽

10.1080/00028487.2014.925972 ◽

2014 ◽

Vol 143 (5) ◽

pp. 1188-1198 ◽

Cited By ~ 7

Author(s):

Ron Pierce ◽

Craig Podner ◽

Laurie Marczak ◽

Leslie Jones

Keyword(s):

River Basin ◽

Habitat Restoration ◽

Stream Temperature ◽

Whirling Disease ◽

Temperature Reduction ◽

Blackfoot River

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Ecological infrastructure planning of large river basin to promote nature conservation and ecosystem functions

Journal of Environmental Management ◽

10.1016/j.jenvman.2022.114482 ◽

2022 ◽

Vol 306 ◽

pp. 114482

Author(s):

Longyang Huang ◽

Jing Wang ◽

Xiaojie Chen

Keyword(s):

Nature Conservation ◽

River Basin ◽

Large River ◽

Ecosystem Functions ◽

Infrastructure Planning ◽

Ecological Infrastructure

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River Water Quality of the Selenga-Baikal Basin: Part II—Metal Partitioning under Different Hydroclimatic Conditions

Water ◽

10.3390/w12092392 ◽

2020 ◽

Vol 12 (9) ◽

pp. 2392

Author(s):

Nikolay Kasimov ◽

Galina Shinkareva ◽

Mikhail Lychagin ◽

Sergey Chalov ◽

Margarita Pashkina ◽

...

Keyword(s):

River Basin ◽

Large River ◽

Metal Partitioning ◽

River Systems ◽

Catchment Scale ◽

Selenga River Basin ◽

Extensive Field ◽

Basin Scale ◽

Wide Range ◽

Dissolved Form

The partitioning of metals and metalloids between their dissolved and suspended forms in river systems largely governs their mobility and bioavailability. However, most of the existing knowledge about catchment-scale metal partitioning in river systems is based on a limited number of observation points, which is not sufficient to characterize the complexity of large river systems. Here we present an extensive field-based dataset, composed of multi-year data from over 100 monitoring locations distributed over the large, transboundary Selenga River basin (of Russia and Mongolia), sampled during different hydrological seasons. The aim is to investigate on the basin scale, the influence of different hydroclimatic conditions on metal partitioning and transport. Our results showed that the investigated metals exhibited a wide range of different behaviors. Some metals were mostly found in the dissolved form (84–96% of Mo, U, B, and Sb on an average), whereas many others predominantly existed in suspension (66–87% of Al, Fe, Mn, Pb, Co, and Bi). Nevertheless, our results also showed a consistently increasing share of metals in dissolved form as the metals were transported to the downstream parts of the basin, closer to the Lake Baikal. Under high discharge conditions (including floods), metal transport by suspended particulate matter was significantly greater (about 2–6 times). However, since high and low water conditions could prevail simultaneously at a given point of time within the large river basin, e.g., as a result of on-going flood propagation, snap-shot observations of metal partitioning demonstrated contrasting patterns with domination of both particulate and dissolved phases in different parts of the basin. Such heterogeneity of metal partitioning is likely to be found in many large river systems. These results point out the importance of looking into different hydroclimatic conditions across space and time, both for management purposes and contaminant modeling efforts at the basin scale.

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