Generation of multistate release–recapture models using a graphic user interface (GUI)

Pope, Adam C.; Skalski, John R.; Lockhart, Trisha; Buchanan, Rebecca A.

doi:10.1186/s40317-016-0115-6

Cited by 2 publications

(4 citation statements)

References 29 publications

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“…Annual movement rates were estimated for each population by using multistate release–recapture models in Program Branch (Pope et al. ), as detailed by Richins () and illustrated in Figure . Parameters and SEs were estimated using maximum likelihood.…”

Section: Methodsmentioning

confidence: 99%

Steelhead Overshoot and Fallback Rates in the Columbia–Snake River Basin and the Influence of Hatchery and Hydrosystem Operations

Richins

Skalski

2018

N American J Fish Manag

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Tributary overshoot occurs when adult salmonids homing to natal sites continue upstream past the mouth of their natal stream. Although overshooting is a common behavior by steelhead Oncorhynchus mykiss in the Columbia River basin, it has not been adequately quantified or explained. Using multistate release–recapture models, we examined the prevalence of overshooting and fallback to natal tributaries by 37,806 PIT‐tagged steelhead from 14 tributaries of the Columbia River basin during 2005–2015. Eight populations had overshooting rates exceeding 50% in at least 1 year. Source of hatchery stock, rearing location, and release practices were found to have appreciable effects on overshoot rates. Overshooting was elevated in hatchery stocks reared upstream of release sites, but this effect may be lessened by utilizing endemic broodstocks and acclimating juveniles within the release basin. For one population of hatchery steelhead, acclimation within the release basin was found to decrease overshooting from 81% to 40%. Across both hatchery and wild populations, successful homing was found to decline 4 percentage points for every 5‐percentage‐point increase in overshoot rate. Average annual fallback probabilities ranged from 0.18 for Walla Walla River hatchery steelhead to 0.75 for Umatilla River wild steelhead. Fish stocks with the greatest fallback probabilities also had the greatest interannual variability in fallback rates. For John Day River wild steelhead and Tucannon River hatchery steelhead, the interannual range in fallback probabilities exceeded 0.50. We found evidence that spill at dams during March may enhance the fallback of overshooting steelhead and contribute to increased homing to natal tributaries. Therefore, additional attention should be paid to facilitating downstream dam passage of adult salmon.

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Section: Methodsmentioning

confidence: 99%

Steelhead Overshoot and Fallback Rates in the Columbia–Snake River Basin and the Influence of Hatchery and Hydrosystem Operations

Richins

Skalski

2018

N American J Fish Manag

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“…However, a comparison of overshoot fallback proportions of the two basic overshoot pathways (upstream of PRD or ICH) has not been conducted. Pope et al (2016) used a multi-state release-recapture model to estimate the overshoot fallback rates for Walla Walla River hatchery steelhead. While hatchery steelhead are subject to direct harvest, Pope et al (2016) reported overshoot return rates of 8.3% and 20.2% for Lower Granite Dam and PRD, respectively.…”

Section: Discussionmentioning

confidence: 99%

“…Pope et al (2016) used a multi-state release-recapture model to estimate the overshoot fallback rates for Walla Walla River hatchery steelhead. While hatchery steelhead are subject to direct harvest, Pope et al (2016) reported overshoot return rates of 8.3% and 20.2% for Lower Granite Dam and PRD, respectively. Because Walla Walla River steelhead that make it to Lower Granite Dam must migrate downstream past four dams in the SR to return to the Walla Walla River compared to between one and five dams in the UCR, these results are not directly comparable.…”

Section: Discussionmentioning

confidence: 99%

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Abundance and Migration Success of Overshoot Steelhead in the Upper Columbia River

Murdoch

See

Truscott

2022

N American J Fish Manag

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Summer steelhead Oncorhynchus mykiss may enter freshwater almost a year before spawning and potentially make long migrations (>1,000 km) to interior headwater habitats. However, in response to suboptimal freshwater habitat conditions (e.g., warmer water temperatures), adult summer steelhead may exhibit complex behaviors during upstream migration in the Columbia River basin. Steelhead may migrate upstream of their natal tributary (hereafter, referred to as “overshoot”) and spend days to several months before subsequently migrating downstream (hereafter, referred to as “fallback”) to their natal tributary to spawn. An expansion of an existing Bayesian patch occupancy model, derived from observations of adult steelhead that were PIT‐tagged to estimate population‐specific abundance upstream of the tagging location, incorporated downstream detection locations to estimate the abundance of overshoot fallbacks. Overshoot steelhead abundance at the tagging location was estimated based on the relationship between the number of known overshoot fallbacks (i.e., the number of steelhead that overshot and successfully migrated downstream to their natal tributary) and their model‐estimated abundance. During the study period (2010–2017), the annual mean proportion of overshoot steelhead that successfully migrated downstream of the tagging location (Priest Rapids Dam) was 0.59 (SD = 0.14). The number of dams encountered by overshoot steelhead during their downstream migration was negatively correlated with their downstream migration success probability. Improved downstream passage survival for adult steelhead will increase the abundance of affected populations while reducing potential genetic introgression of upstream populations (i.e., strays). This is the first study to estimate the abundance of overshoot and fallback steelhead, providing the data necessary for scientists to estimate potential conservation benefits of improved downstream survival. For example, surface flow passage routes (e.g., sluiceways and temporary spillway weirs) are very effective in guiding and passing adult steelhead downstream of Columbia River hydroelectric projects and data from this assessment show that changes in dam operations throughout the downstream migration period may maximize conservation benefits.

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Generation of multistate release–recapture models using a graphic user interface (GUI)

Cited by 2 publications

References 29 publications

Steelhead Overshoot and Fallback Rates in the Columbia–Snake River Basin and the Influence of Hatchery and Hydrosystem Operations

Steelhead Overshoot and Fallback Rates in the Columbia–Snake River Basin and the Influence of Hatchery and Hydrosystem Operations

Abundance and Migration Success of Overshoot Steelhead in the Upper Columbia River

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