Foraging modes and movements of <i>Oncorhynchus mykiss</i> as flow and invertebrate drift recede in a California stream

Rossi, Gabriel J.; Power, Mary E.; Pneh, Shelley; Neuswanger, Jason R.; Caldwell, Timothy J.

doi:10.1139/cjfas-2020-0398

Cited by 17 publications

(26 citation statements)

References 68 publications

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“…Future work to evaluate the response of bioenergetics and individual‐based models to reductions in RCT depth would improve this aspect of risk assessment (Rossi et al. 2021).…”

Section: Discussionmentioning

confidence: 99%

“…2008; Rossi et al. 2021) additional work relating biological and ecological response to RCT depth and RCT‐ Q curves is important to further validate this assumption.…”

Section: Discussionmentioning

confidence: 99%

“…Rossi et al. (2021), found that RCT depth predicted changes in juvenile steelhead trout ( Oncorhynchus mykiss ) foraging mode in the upstream pool better than streamflow, pool depth, invertebrate drift concentration, pool velocity, or a drift foraging bioenergetics model.…”

Section: Introductionmentioning

confidence: 99%

“…2008; Rossi et al. 2021). Third, stream depth, including RCT depth, is more easily derived, and more readily scalable than streamflow (Leopold and Maddock 1953; Richards 1978; Lisle 1987).…”

Section: Introductionmentioning

confidence: 99%

“…2008; Newbury and Gaboury 2013; Rossi et al. 2021). In a hydraulic modeling framework, Pasternack et al.…”

Section: Introductionmentioning

confidence: 99%

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Hydraulic Properties of the Riffle Crest and Applications for Stream Ecosystem Management

Rossi

Mierau

Carah

2021

J American Water Resour Assoc

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Riffle crests are important hydraulic controls in riffle‐pool‐dominated streams, influencing pool hydraulics and water quality that collectively control lotic habitat for many organisms. We define a simple stream depth measurement, the riffle crest thalweg (RCT), describe measurement methods and utility, and suggest that RCT depth is a better independent variable than streamflow (Q) for many instream flow and habitat assessment applications. Using RCT depth as an independent variable, rather than streamflow, reduces the need for gauging or streamflow measurements in many management applications. Unlike streamflow, RCT depth varies directly with fundamental elements of riverine habitat such as channel morphology and bed roughness. We also suggest that relationships between RCT depth and streamflow (RCT‐Q curves) can be used to evaluate the risk of streamflow alteration at ungauged sites. We describe three case studies to demonstrate the utility of RCT depth and RCT‐Q rating curves in stream ecosystem management: (1) evaluating the effect of a top‐down flow prescription on modeled salmonid habitat, (2) estimating the risk from the incremental reduction of RCT depth on habitat and ecological responses, and (3) identifying relationships between RCT depth and dissolved oxygen in ungauged streams. An easy‐to‐measure, inexpensive, and ecologically sensitive metric, RCT depth holds promise as a useful tool in stream ecosystem management.

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“…Future work to evaluate the response of bioenergetics and individual‐based models to reductions in RCT depth would improve this aspect of risk assessment (Rossi et al. 2021).…”

Section: Discussionmentioning

confidence: 99%

“…2008; Rossi et al. 2021) additional work relating biological and ecological response to RCT depth and RCT‐ Q curves is important to further validate this assumption.…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…2008; Newbury and Gaboury 2013; Rossi et al. 2021). In a hydraulic modeling framework, Pasternack et al.…”

Section: Introductionmentioning

confidence: 99%

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Hydraulic Properties of the Riffle Crest and Applications for Stream Ecosystem Management

Rossi

Mierau

Carah

2021

J American Water Resour Assoc

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Seasonal growth potential of Oncorhynchus mykiss in streams with contrasting prey phenology and streamflow

et al. 2022

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The growth of any organism depends on habitat conditions, food availability, and their seasonal interactions. Yet in the vast literature on Pacific salmon (Oncorhynchus), the seasonal interaction between habitat conditions and food availability has received relatively little attention. We examined juvenile Oncorhynchus mykiss rearing, physical habitat, and resource phenologies in two Mediterranean coastal streams-one perennial, cool, and shaded and the other intermittent, seasonally warm, and sunny. We used a bioenergetic model to investigate the timing and magnitude of growth potential for drift-foraging O. mykiss during the spring and summer in both systems. Growth potential peaked at least 2 months earlier in the intermittent stream than in the perennial stream. By early summer (June), growth potential had declined in the intermittent stream, whereas growth rates were peaking in the perennial stream. However, the mid-July lipid content of juvenile O. mykiss in the intermittent stream was nearly twice that of fish in the perennial stream. By late summer (August), foraging profitability declined in both streams, as abiotic conditions in the intermittent stream approached lethal. In contrast, the perennial stream maintained suitable abiotic conditions even though the growth rate was low. We suggest that the divergent resource phenologies and seasonal mortality risks experienced by anadromous O. mykiss rearing in these streams could drive diversification of traits governing size, age, and timing of outmigration.

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Flow augmentation from off‐channel storage improves salmonid habitat and survival

Rossi,

Obedzinski,

Pneh

et al. 2023

N American J Fish Manag

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In the Western United States, juvenile salmon and steelhead are especially vulnerable to streamflow depletion in the dry season. Releasing water from off‐channel storage into small streams is a novel restoration strategy to offset impacts from anthropogenic flow alteration on salmonid fishes. To date, no studies have evaluated the ecological effects of small‐scale flow augmentations. Here, we quantify the effects of one such augmentation project on habitat connectivity, water quality, invertebrate drift, juvenile salmonid movement and survival. Our study took place in a Northern California stream and included an unusually wet summer (2019) and a more typical dry summer (2020). We found that differences in ambient streamflows between the two years mediated the physical and ecological effects of a 13.9 L/s augmentation treatment. In the dry year, habitat connectivity and dissolved oxygen markedly increased at sites > 1.5 km downstream from the point of augmentation, whereas during the wet year effects on those variables were negligible. In both years, invertebrate drift marginally increased following augmentation. Inter‐pool movement of wild juvenile steelhead (Oncorhynchus mykiss) and stocked Coho Salmon (O. kisutch) increased following augmentation during the dry summer but not the wet summer. Flow augmentation increased the survival probability for salmonids, with a larger effect during the dry summer (24% higher survival for Coho Salmon and 20% higher for steelhead), than during the wet summer (when no effect was observed for steelhead survival and Coho Salmon survival increased by 11%). This study indicates that appropriately designed small‐scale flow augmentations can improve conditions for rearing salmonids in small streams, particularly during dry years. More broadly, it provides empirical evidence that efforts to restore summer streamflow in small, salmon‐bearing streams can yield significant ecological benefits.

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Foraging modes and movements of Oncorhynchus mykiss as flow and invertebrate drift recede in a California stream

Cited by 17 publications

References 68 publications

Hydraulic Properties of the Riffle Crest and Applications for Stream Ecosystem Management

Hydraulic Properties of the Riffle Crest and Applications for Stream Ecosystem Management

Seasonal growth potential of Oncorhynchus mykiss in streams with contrasting prey phenology and streamflow

Flow augmentation from off‐channel storage improves salmonid habitat and survival

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