Demographics and run timing of adult Lost River (&lt;i&gt;Deltistes luxatus&lt;/i&gt;) and shortnose (&lt;i&gt;Chasmistes brevirostris&lt;/i&gt;) suckers in Upper Klamath Lake, Oregon, 2011

Hewitt, David A.; Janney, Eric C.; Hayes, Brian S.; Harris, Alta C.

doi:10.3133/ofr20121193

Cited by 2 publications

(14 citation statements)

References 5 publications

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“…Presently, the largest remaining sucker population resides in Upper Klamath Lake, Oregon (Hewitt et al 2012). Most fish in the spawning aggregations are between 20 and 25 years old (Hewitt et al 2012). This lack of diversity in age structure and a near absence of fish 1-7 years of age is strong evidence of ongoing recruitment failure in this population.…”

Section: Effects Of Lake Surface Elevation On Shorelinespawning Lost mentioning

confidence: 96%

“…Most Lost River Suckers in Upper Klamath Lake make annual spawning migrations up the Williamson and Sprague rivers between February and May (Hewitt et al 2012). A smaller distinct subpopulation spawns during the same time period in the vicinity of several groundwater upwelling areas along the eastern shoreline of the lake and includes at least 10,000 individuals (Janney et al 2008;Hewitt et al 2012; Figure 2).…”

Section: Effects Of Lake Surface Elevation On Shorelinespawning Lost mentioning

confidence: 97%

“…Lost River Suckers arrive at shoreline spawning areas each year when lake water temperature reaches approximately 6 C (Hewitt et al 2012). As is typical of western lake suckers, a Lost River Sucker spawning event lasts less than 6 s in which a single female is commonly flanked by two males (although up to seven males have been observed).…”

Section: Effects Of Lake Surface Elevation On Shorelinespawning Lost mentioning

confidence: 98%

“…A smaller distinct subpopulation spawns during the same time period in the vicinity of several groundwater upwelling areas along the eastern shoreline of the lake and includes at least 10,000 individuals (Janney et al 2008;Hewitt et al 2012; Figure 2). Due to strong fidelity to spawning sites located in either the lake or its tributaries (Janney et al 2008), the Lost River Suckers that use these shoreline spawning areas are considered to be a distinct management unit for recovery planning purposes (USFWS 2012).…”

Section: Effects Of Lake Surface Elevation On Shorelinespawning Lost mentioning

confidence: 99%

“…A number of distinct Lost River Sucker populations have been extirpated throughout their historical range (NRC 2004). Presently, the largest remaining sucker population resides in Upper Klamath Lake, Oregon (Hewitt et al 2012). Most fish in the spawning aggregations are between 20 and 25 years old (Hewitt et al 2012).…”

Section: Effects Of Lake Surface Elevation On Shorelinespawning Lost mentioning

confidence: 99%

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Effects of Lake Surface Elevation on Shoreline‐Spawning Lost River Suckers

Burdick

Hewitt

Rasmussen

et al. 2015

N American J Fish Manag

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We analyzed remote detection data from PIT‐tagged Lost River Suckers Deltistes luxatus at four shoreline spawning areas in Upper Klamath Lake, Oregon, to determine whether spawning of this endangered species was affected by low water levels. Our investigation was motivated by the observation that the surface elevation of the lake during the 2010 spawning season was the lowest in 38 years. Irrigation withdrawals in 2009 that were not replenished by subsequent winter–spring inflows caused a reduction in available shoreline spawning habitat in 2010. We compared metrics of skipped spawning, movement among spawning areas, and spawning duration across 8 years (2006–2013) that had contrasting spring water levels. Some aspects of sucker spawning were similar in all years, including few individuals straying from the shoreline areas to spawning locations in lake tributaries and consistent effects of increasing water temperatures on the accumulation of fish at the spawning areas. During the extreme low water year of 2010, 14% fewer female and 8% fewer male suckers joined the shoreline spawning aggregation than in the other years. Both males and females visited fewer spawning areas within Upper Klamath Lake in 2010 than in other years, and the median duration at spawning areas in 2010 was at least 36% shorter for females and 20% shorter for males relative to other years. Given the imperiled status of the species and the declining abundance of the population in Upper Klamath Lake, any reduction in spawning success and egg production could negatively impact recovery efforts. Our results indicate that lake surface elevations above 1,262.3–1,262.5 m would be unlikely to limit the number of spawning fish and overall egg production. Received May 16, 2014; accepted January 29, 2015

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Section: Effects Of Lake Surface Elevation On Shorelinespawning Lost mentioning

confidence: 96%

Section: Effects Of Lake Surface Elevation On Shorelinespawning Lost mentioning

confidence: 97%

Section: Effects Of Lake Surface Elevation On Shorelinespawning Lost mentioning

confidence: 98%

Section: Effects Of Lake Surface Elevation On Shorelinespawning Lost mentioning

confidence: 99%

Section: Effects Of Lake Surface Elevation On Shorelinespawning Lost mentioning

confidence: 99%

See 3 more Smart Citations

Effects of Lake Surface Elevation on Shoreline‐Spawning Lost River Suckers

Burdick

Hewitt

Rasmussen

et al. 2015

N American J Fish Manag

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Water and Endangered Fish in the Klamath River Basin: Do Upper Klamath Lake Surface Elevation and Water Quality Affect Adult Lost River and Shortnose Sucker Survival?

Krause

Janney

Burdick

et al. 2022

N American J Fish Manag

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In the western United States, water allocation decisions often incorporate the needs of endangered fish. In the Klamath River basin, an understanding of temporal variation in annual survival rates of Shortnose Suckers Chasmistes brevirostris and Lost River Suckers Deltistes luxatus and their relation to environmental drivers is critical to water management and sucker recovery. Extinction risk is high for these fish because most individuals in the populations are approaching their maximum life span and recruitment of new fish into the adult populations has never exceeded mortality losses in the past 22 years. We used a time series of mark–recapture data from the years 1999–2021 to analyze the relationship between lake level, water quality covariates, and survival of adult Shortnose Suckers and two spawning populations of Lost River Suckers in Upper Klamath Lake, Oregon. We compared competing model hypotheses in a maximum likelihood framework using Akaike's information criterion and then ran the top environmental covariates in a Bayesian framework to estimate how much of the variation in survival was explained by these covariates as compared to random variation. The complementary analyses found almost unequivocal support for our base model without environmental covariates. Estimated adult sucker survival was high across the time series and consistent with sucker life history (mean annual survival = 0.82–0.91). This suggests that adult suckers were generally robust to interannual variation in lake levels as well as consistently poor water quality within the years of our data set. Recovery time is limited, as a declining survival trend for adult suckers in recent years may be due to the onset of senescence. The successful recovery of suckers in Upper Klamath Lake may rely on shifting research from the causes of adult mortality and its relationship with lake surface elevation to the causes of poor recruitment into adult populations.

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Demographics and run timing of adult Lost River (<i>Deltistes luxatus</i>) and shortnose (<i>Chasmistes brevirostris</i>) suckers in Upper Klamath Lake, Oregon, 2011

Cited by 2 publications

References 5 publications

Effects of Lake Surface Elevation on Shoreline‐Spawning Lost River Suckers

Effects of Lake Surface Elevation on Shoreline‐Spawning Lost River Suckers

Water and Endangered Fish in the Klamath River Basin: Do Upper Klamath Lake Surface Elevation and Water Quality Affect Adult Lost River and Shortnose Sucker Survival?

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