Status of Lost River Sucker and Shortnose Sucker

Rasmussen, J. E.

doi:10.3398/064.071.0402

Cited by 18 publications

(18 citation statements)

References 45 publications

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“…Elevations are in meters above mean sea level in the U.S. Bureau of Reclamation datum. LAKE LEVEL AND LOST RIVER SUCKER SPAWNING 479 interactions with nonnative species, and habitat degradation (Belk et al 2011;Rasmussen 2011). Lost River Suckers live up to 50 years and can grow to 800 mm FL and 3.5 kg (Moyle 2002;Terwilliger et al 2010).…”

Section: Effects Of Lake Surface Elevation On Shorelinespawning Lost mentioning

confidence: 99%

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: 99%

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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“…Hypothesized causes of juvenile sucker mortality include loss of habitat, poor water-quality, disease, parasites, and predation (mostly by birds) (Rasmussen, 2011); however, causes of high apparent juvenile mortality are unknown. To determine the causes and timing of juvenile sucker mortality and to monitor the long-term success of recovery actions, the U.S.…”

Section: Introductionmentioning

confidence: 99%

Juvenile Lost River and shortnose sucker year-class formation, survival, and growth in Upper Klamath Lake, Oregon and Clear Lake Reservoir, California—2017 Monitoring Report

Bart¹,

Burdick²,

Hoy³

et al. 2020

Open-File Report

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“…Historically, these species were extremely abundant despite being restricted to only a handful of lakes, all within roughly 3,000 km 2 . Both species have now declined drastically in abundance across all populations and have been extirpated from one major growth habitat and several spawning locations (Rasmussen 2011).…”

Section: Introductionmentioning

confidence: 99%

Population Viability of Endangered Lost River Sucker and Shortnose Sucker and the Effects of Assisted Rearing

Rasmussen

Childress

2018

Journal of Fish and Wildlife Management

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The Lost River Sucker Deltistes luxatus and Shortnose Sucker Chasmistes brevirostris are two narrowly endemic fish species in the upper Klamath Basin of southern Oregon and northern California. Both species have been federally listed as endangered pursuant to the U.S. Endangered Species Act since 1988 because of dramatic declines in abundance and distribution. In Upper Klamath Lake, Oregon, both species have only recruited a single cohort to the adult populations since that time. Most individuals in this population are at or older than the expected life span of the species. Consequently, the U.S. Fish and Wildlife Service and the Klamath Tribes have initiated assisted rearing efforts to stabilize the population. However, it is unclear how quickly these populations might become extirpated and how assisted rearing might alter population trajectories. We modeled the potential for extinction and recovery of the populations of endangered Lost River Sucker and Shortnose Sucker in Upper Klamath Lake. We simulated population trajectories over the next 50 y with a stochastic population viability assessment approach. Projections indicate that if population trajectories do not change, the Shortnose Sucker population may decline by 78% to number < 5,000 in 10 y and become completely extirpated within the next 30 (18.6% probability) to 40 y (99% probability). The two Lost River Sucker populations have a greater likelihood to remain extant after 50 y, with only 1% probability of extinction given our scenarios and assumptions, but the populations are likely to number fewer than 1,000 individuals. Our results also suggest that rearing of Klamath Lake sucker species in a controlled environment for augmenting the natural population will be effective in reducing extirpation probabilities over the next 50 y if survival to recruitment can be achieved, but a long-term effort of at least 40 y will be required. The necessity of long-term augmentation to ensure population persistence in the absence of natural recruitment underscores the urgent need to determine and address the causes of recruitment failure in the wild.

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Status of Lost River Sucker and Shortnose Sucker

Cited by 18 publications

References 45 publications

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

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

Juvenile Lost River and shortnose sucker year-class formation, survival, and growth in Upper Klamath Lake, Oregon and Clear Lake Reservoir, California—2017 Monitoring Report

Population Viability of Endangered Lost River Sucker and Shortnose Sucker and the Effects of Assisted Rearing

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