Gary E. Johnson
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View article: Assessing the cumulative effects of nearshore habitat restoration actions for multiple populations of juvenile salmon in Whidbey Basin, Washington: foundation and approach for synthesis and evaluation
Assessing the cumulative effects of nearshore habitat restoration actions for multiple populations of juvenile salmon in Whidbey Basin, Washington: foundation and approach for synthesis and evaluation Open
Ecosystem restoration is a common tool for re-establishing ecosystem processes, structures, and functions to improve biodiversity and services in coastal and estuarine ecosystems. In the Salish Sea, salmon habitats have been fragmented, re…
View article: Export of macroinvertebrate prey from tidal freshwater wetlands provides a significant energy subsidy for outmigrating juvenile salmon
Export of macroinvertebrate prey from tidal freshwater wetlands provides a significant energy subsidy for outmigrating juvenile salmon Open
Tidal freshwater wetlands linking terrestrial, riverine, and saline habitats are critical areas for material processing and exchange. Once historically widespread, herbaceous marsh and forested tidal freshwater wetlands especially are now …
View article: Adaptive management of large‐scale ecosystem restoration: increasing certainty of habitat outcomes in the Columbia River Estuary, <scp>U.S.A.</scp>
Adaptive management of large‐scale ecosystem restoration: increasing certainty of habitat outcomes in the Columbia River Estuary, <span>U.S.A.</span> Open
Ecological restoration programs in dynamic coastal environments can benefit from adaptive management, including an iterative process for identifying and addressing critical uncertainties. We highlight key developments under the three pilla…
View article: Indexing habitat opportunity for juvenile anadromous fishes in tidal-fluvial wetland systems
Indexing habitat opportunity for juvenile anadromous fishes in tidal-fluvial wetland systems Open
In intertidal wetlands, habitat access by out-migrating juvenile anadromous fishes, such as salmon (Oncorhynchus spp.), is influenced by both physical and biological factors. Physical limits are set by inundation patterns and water quality…
View article: Applying cumulative effects to strategically advance large‐scale ecosystem restoration
Applying cumulative effects to strategically advance large‐scale ecosystem restoration Open
International efforts to restore degraded ecosystems will continue to expand over the coming decades, yet the factors contributing to the effectiveness of long‐term restoration across large areas remain largely unexplored. At large scales,…
View article: Passage and Survival of Chinook Salmon at Lookout Point Dam, Fall 2017 and Spring 2018 (Final Report)
Passage and Survival of Chinook Salmon at Lookout Point Dam, Fall 2017 and Spring 2018 (Final Report) Open
This report presents the results of a fish passage and survival study conducted by the Pacific Northwest National Laboratory (PNNL) for the U.S. Army Corps of Engineers-Portland District (USACE) at Lookout Point Dam (Lookout Point) during …
View article: Storm‐driven particulate organic matter flux connects a tidal tributary floodplain wetland, mainstem river, and estuary
Storm‐driven particulate organic matter flux connects a tidal tributary floodplain wetland, mainstem river, and estuary Open
The transport of terrestrial plant matter into coastal waters is important to regional and global biogeochemical cycles, and methods for assessing and predicting fluxes in such dynamic environments are needed. We investigated the hypothesi…
View article: A Hydropower Biological Evaluation Toolset (HBET) for Characterizing Hydraulic Conditions and Impacts of Hydro-Structures on Fish
A Hydropower Biological Evaluation Toolset (HBET) for Characterizing Hydraulic Conditions and Impacts of Hydro-Structures on Fish Open
Approximately 16% of the world’s electricity and over 80% of the world’s renewable electricity is generated from hydropower resources, and there is potential for developing significantly more new hydropower capacity. In practice, however, …
View article: Behavior, Distribution, and Passage Metrics of Juvenile Chinook Salmon Above and Below Lookout Point Dam, Fall 2016 and Spring 2017 (Final Report)
Behavior, Distribution, and Passage Metrics of Juvenile Chinook Salmon Above and Below Lookout Point Dam, Fall 2016 and Spring 2017 (Final Report) Open
This report presents the results of a fish behavior, distribution, and passage study conducted by the Pacific Northwest National Laboratory (PNNL) for the U.S. Army Corps of Engineers Portland District (USACE) at Lookout Point Dam (or Look…
View article: Estuary ecosystem restoration: implementing and institutionalizing adaptive management
Estuary ecosystem restoration: implementing and institutionalizing adaptive management Open
We implemented and institutionalized an adaptive management (AM) process for the Columbia Estuary Ecosystem Restoration Program, which is a large‐scale restoration program focused on improving ecosystem conditions in the 234‐km lower Colum…
View article: Evidence‐based evaluation of the cumulative effects of ecosystem restoration
Evidence‐based evaluation of the cumulative effects of ecosystem restoration Open
This study adapts and applies the evidence‐based approach for causal inference, a medical standard, to the restoration and sustainable management of large‐scale aquatic ecosystems. Despite long‐term investments in restoring aquatic ecosyst…