Aquatic habitat response to climate-driven hydrologic regimes and water operations in a montane reservoir in the Pacific Northwest, USA

Weigel, Dana E.; Vilhena, Leticia Chamelete De; Woods, Paul F.; Tonina, Daniele; Tranmer, Andrew W.; Benjankar, Rohan; Marti, Clelia; Goodwin, Peter

doi:10.1007/s00027-017-0544-1

Cited by 8 publications

(3 citation statements)

References 31 publications

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“…Bull trout were rarely observed in Arrowrock Reservoir during the summer owing to increased temperatures and potentially low dissolved oxygen (Maret & Schultz, 2013), which can prevent migration through the reservoir in August and September. The pattern of moving into tributaries in the spring or early summer is consistent with other populations of bull trout (Al‐Chokhachy & Budy, 2008; Johnston & Post, 2009; Weigel et al, 2017), as well as other salmonids (Benjamin, Wetzel, Martens, Larsen, & Connolly, 2014; Young, 2011).…”

Section: Discussionsupporting

confidence: 80%

“…The pattern of F I G U R E 6 Relationship between energy content (kJ/g) prior to migration and day of spawning migration (a, c, e) or the annual degree days (°C; b, d, f) and the outcome if a fish will skip, migrate, and/or spawn for movement scenarios 1 (a, b), 3 (c, d), and 5 (e, f). See Table 1 for movement scenario descriptions moving into tributaries in the spring or early summer is consistent with other populations of bull trout (Al-Chokhachy & Budy, 2008;Johnston & Post, 2009;Weigel et al, 2017), as well as other salmonids (Benjamin, Wetzel, Martens, Larsen, & Connolly, 2014;Young, 2011).…”

Section: Discussionsupporting

confidence: 73%

“…In the future, temperatures throughout the Boise River basin are projected to increase (Isaak et al, 2010). Accordingly, consideration of future scenarios for stream temperature, and opportunities to manage thermal regimes in the headwaters and reservoirs may help to identify climate adaptation measures to benefit bull trout (e.g., Benjankar et al, 2018; Weigel et al, 2017). Furthermore, incorporation of all life stages and habitat use throughout the watershed via a demographic model (e.g., Jørgensen et al, 2006) may further elaborate how this species is truly influenced by changing temperatures in time and space.…”

Section: Discussionmentioning

confidence: 99%

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Thermal heterogeneity, migration, and consequences for spawning potential of female bull trout in a river–reservoir system

Benjamin

Vidergar

Dunham

2020

Ecology and Evolution

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The likelihood that fish will initiate spawning, spawn successfully, or skip spawning in a given year is conditioned in part on availability of energy reserves. We evaluated the consequences of spatial heterogeneity in thermal conditions on the energy accumulation and spawning potential of migratory bull trout (Salvelinus confluentus) in a regulated river-reservoir system. Based on existing data, we identified a portfolio of thermal exposures and migratory patterns and then estimated their influence on energy reserves of female bull trout with a bioenergetics model. Spawning by females was assumed to be possible if postspawning energy reserves equaled or exceeded 4 kJ/g. Given this assumption, results suggested up to 70% of the simulated fish could spawn each year. Fish that moved seasonally between a cold river segment and a warmer reservoir downstream had a greater growth rate and higher propensity to spawn in a given year (range: 40%-70%) compared with fish that resided solely in the cold river segment (25%-40%). On average, fish that spawned lost 30% of their energy content relative to their prespawn energy. In contrast, fish that skipped spawning accumulated, on average, 16% energy gains that could be used toward future gamete production. Skipped spawning occurred when water temperatures were relatively low or high, and if upstream migration occurred relatively late (mid-July or later) or early (early-May or earlier). Overall, our modeling effort suggests the configuration of thermal exposures, and the ability of bull trout to exploit this spatially and temporally variable thermal conditions can strongly influence energy reserves and likelihood of successful spawning.

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Section: Discussionsupporting

confidence: 80%

Section: Discussionsupporting

confidence: 73%

Section: Discussionmentioning

confidence: 99%

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Thermal heterogeneity, migration, and consequences for spawning potential of female bull trout in a river–reservoir system

Benjamin

Vidergar

Dunham

2020

Ecology and Evolution

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Geomorphic river classifications based on different methods coincide in predicting fish assemblage structure

Bañales‐Seguel,

Górski,

Zurita

et al. 2024

Earth Surf Processes Landf

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River classification is a necessary starting point for understanding river ecosystems and developing management guidelines. Using GIS to analyse an Andean river basin, we compare the application of two geomorphic classification methods at the segment scale: The Geomorphic Units Survey Classification System (GUS) and the Functional Process Zones (FPZ). Segment definition follows a manual procedure in GUS and a semi‐automated procedure in FPZ. Our objective was to assess the relationship between geomorphology and fish assemblages' structure. Fish sampling was carried out in collaboration with participants from local indigenous Mapuche‐Pewenche communities. Non‐parametric multivariate statistical analyses were conducted in order to quantify and describe geomorphic patterns and whether fish assemblages responded consistently with river classifications. Both classifications give insight into the physical characteristics of rivers, such as slope and floodplain width, that make habitat available for different fish assemblages. The two methods provide results that consistently coincide in their identification of geographic distribution and main geomorphic variables of different river types (geomorphic types) throughout the river network. The variation of different river geomorphologies was associated with variation in fish assemblage structure. Geomorphic variables that best characterize the distribution pattern of fish assemblages were elevation, confinement and valley floor width. Confined rivers accommodated highly similar fish assemblages dominated by invasive trout (Salmo trutta and Oncorhynchus mykiss). Unconfined rivers located at higher elevations had greater temporal variability and were mainly composed of trout and native catfish Trichomycterus areolatus. Semiconfined rivers presented the highest geomorphic variability and were associated with high spatial and temporal variability of fish assemblages characterized by both native and non‐native species. The association between fish assemblages and fluvial geomorphology could help in prioritizing rivers for exotic fish species control. These findings should aid in restoring highly intervened Andean rivers and improving management techniques in basins with a variety of human activities.

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Causes, Assessment, and Treatment of Nutrient (N and P) Pollution in Rivers, Estuaries, and Coastal Waters

et al. 2018

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Aquatic habitat response to climate-driven hydrologic regimes and water operations in a montane reservoir in the Pacific Northwest, USA

Cited by 8 publications

References 31 publications

Thermal heterogeneity, migration, and consequences for spawning potential of female bull trout in a river–reservoir system

Thermal heterogeneity, migration, and consequences for spawning potential of female bull trout in a river–reservoir system

Geomorphic river classifications based on different methods coincide in predicting fish assemblage structure

Causes, Assessment, and Treatment of Nutrient (N and P) Pollution in Rivers, Estuaries, and Coastal Waters

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