Instream Flows and “Angler Habitat:” Flow Effects on Fishability on Eight Pacific Northwest Rivers

Whittaker, Doug; Shelby, Bo; Abrams, Jesse

doi:10.1080/10871200600894951

Cited by 4 publications

(5 citation statements)

References 15 publications

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“…Thus, both high and low water levels seem to discourage fishing effort, and anglers seem to favor intermediate levels. Analogous behavior was reported for anglers in wadable rivers, where fishability was reduced by excessively low and high flows (Whittaker et al 2006). …”

Section: Discussionmentioning

confidence: 87%

“…Several studies have reported on the effect of changes in reservoir water levels on overall recreational use and economic value (e.g., Cole et al 1990, Ward et al 1996, Hanson et al 2000, but studies linking recreational fishing effort (hours fished) to water levels in reservoirs are uncommon (e.g., Jakus et al 2000). More attention has been given to the analogous topic of correlating stream flows to recreational fishing (Johnson and Adams 1988, Willis and Garrod 1999, Whittaker et al 2006.…”

mentioning

confidence: 99%

“…The * Corresponding author: smiranda@usgs.gov magnitude of the change in participation relative to a change in water level may depend on a number of factors labeled as fishability, a term that refers to the adequacy of the fishing circumstances from an angler's perspective (Whittaker et al 2006). Fishability may integrate factors such as physical characteristics of the reservoir and access facilities, both affected by water level changes.…”

mentioning

confidence: 99%

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Water levels shape fishing participation in flood-control reservoirs

Miranda

Meals

2013

Lake and Reservoir Management

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Section: Discussionmentioning

confidence: 87%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Water levels shape fishing participation in flood-control reservoirs

Miranda

Meals

2013

Lake and Reservoir Management

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“…Angler movement decisions are further influenced by their understanding of the interaction between Largemouth Bass behaviors and environmental variables (Whittaker et al. ). Air temperature influenced Largemouth Bass tournament capture probability and may signify changes in Largemouth Bass behavior.…”

Section: Discussionmentioning

confidence: 99%

Influence of Largemouth Bass Behaviors, Angler Behaviors, and Environmental Conditions on Fishing Tournament Capture Success

2020

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Tournament anglers typically possess extensive knowledge of the habitat and seasonal movement of their targeted species. While fish-angler behavioral relationships are critical to understanding fish catchability, few studies have assessed how fish behavior influences their vulnerability to capture by tournament anglers. Our objectives were to determine if Largemouth Bass Micropterus salmoides behavior, angler behavior, and environmental conditions affect tournament angler catch rate (CPUE) and Largemouth Bass capture probability at fishing tournaments. Forty-nine Largemouth Bass were tracked weekly using radiotelemetry during a 4-month period. Five tournament anglers were also selected at weekly tournament events and tracked continuously using a handheld GPS unit. We quantified individual Largemouth Bass behaviors (home range, weekly movement rate, depth use, and spatial overlap with anglers), angler behaviors (depth use, angler movement rate), and environmental conditions (air and water temperature) and used these estimates as covariates in a multiple regression model to assess their effects on tournament CPUE and then used a multistate mark-recapture model to estimate Largemouth Bass capture probability at tournaments. Our results indicate that Largemouth Bass movement rate, angler fishing depth, and air temperature were highly correlated to tournament angler CPUE. Mark-recapture models also indicated that air temperature and angler-fish overlap were positively associated with Largemouth Bass capture probability while fish total length, home range, movement rate, and depth use were not successful in characterizing individual variation in capture probability. Our results indicate that Largemouth Bass that are encountered by anglers are more likely to be captured, whereas mismatches between angler and Largemouth Bass behavioral factors, including depth use and movement rates, may result in decreased tournament capture rates. Consideration and continued evaluation of the relationships between Largemouth Bass and angler behaviors and environmental variables is critical to fisheries management as tournament pressure paired with high capture probabilities and selective angling can have large-scale population-level impacts.

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“…While the downstream effects of dams on the hydrology, morphology, and riparian ecology of rivers have been documented extensively in the United States (Graf, ; Schmidt & Wilcock, ; Williams & Wolman, ), there are a growing number of studies that focus on downstream dam impacts to recreational resources. These studies include analysis of instream flow needs for boating (Rood, George, George, & Tymensen, ; Stafford, Fey, & Vaske, ; Whittaker & Shelby, ) and fishing (Whittaker, Shelby, & Abrams, ), boater preferences of downstream sandbar size and characteristics (Stewart et al, ), and river trip planning (Roberts, Stallman, & Bieri, ). This study aims to complement previous recreational research by focusing on the downstream geomorphic and vegetation impacts to sandbars used recreationally as campsites.…”

Section: Introductionmentioning

confidence: 99%

Quantifying geomorphic and vegetation change at sandbar campsites in response to flow regulation and controlled floods, Grand Canyon National Park, Arizona

Hadley

Grams

Kaplinski

2018

River Research & Apps

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Sandbars along the Colorado River in Grand Canyon National Park, USA, are an important recreational resource used as campsites by over 25,000 river runners and hikers annually. The number and size of campsites decreased following the completion of Glen Canyon Dam in 1963 due to reductions of sediment that replenish sandbars and increases in vegetation cover caused by flow regulation. Campsite area continues to decrease despite the use of controlled floods to rebuild sandbars. We quantify the relative magnitude of factors that contribute to changes in campsite size, such as fluvial deposition and erosion, gullying, and vegetation expansion with analysis of four-band aerial imagery and digital elevation models. Campsite area declined by 37% between 2002 and 2016 (an average of 161 m 2 per site at long-term monitoring sites). Two drivers contributed to campsite area change: (a) short-term gains and losses associated with controlled floods and flood-deposit erosion and (b) long-term one-directional loss of campsite area caused by vegetation encroachment. There was more erosion and slope change at sites in critical reaches-sections of river where campsites are infrequent or in high demand-than in noncritical reaches. Vegetation continues to expand at campsites under flow regulation, particularly in noncritical reaches. Although controlled floods have contributed to short-term increases in sandbar size, long-term increases in campsite area have not occurred because of sandbar erosion between controlled floods and vegetation expansion. Manual vegetation removal may need to be considered in future management strategies.

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Instream Flows and “Angler Habitat:” Flow Effects on Fishability on Eight Pacific Northwest Rivers

Cited by 4 publications

References 15 publications

Water levels shape fishing participation in flood-control reservoirs

Water levels shape fishing participation in flood-control reservoirs

Influence of Largemouth Bass Behaviors, Angler Behaviors, and Environmental Conditions on Fishing Tournament Capture Success

Quantifying geomorphic and vegetation change at sandbar campsites in response to flow regulation and controlled floods, Grand Canyon National Park, Arizona

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