Inter-annual variability in apparent relative production, survival, and growth of juvenile Lost River and shortnose suckers in Upper Klamath Lake, Oregon, 2001–15

Burdick, Summer M.; Martin, Barbara A.

doi:10.3133/ofr20171069

Cited by 19 publications

(70 citation statements)

References 10 publications

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“…Suckers collected from Upper Klamath Lake did not show signs of widespread or severe disease or parasite problems despite results of previous studies that report annual lake-wide decreases in catches of age-0 suckers to near-0 by about September each year (Burdick and Martin, 2017). The lack of severely diseased fish could be explained, at least in part, by the passive gear used in our study that may be biased toward healthy fish that are active enough to swim into our nets.…”

Section: Discussioncontrasting

confidence: 52%

“…The difference in whole-body triglyceride between Upper Klamath Lake and Clear Lake Reservoir in 2014 may be a result of differences in age classes, individuals, or environments (Post and Parkinson, 2001;Bennett and others, 2007). Lower whole-body triglyceride content for Lost River suckers in 2015 than in 2014 co-occurred with slower Lost River sucker growth and cooler July and September water temperatures (Burdick and Martin, 2017). In contrast, shortnose suckers had similar triglyceride concentrations and similar growth in 2015 and 2014 (Burdick and Martin, 2017).…”

Section: Discussionmentioning

confidence: 97%

“…Lower whole-body triglyceride content for Lost River suckers in 2015 than in 2014 co-occurred with slower Lost River sucker growth and cooler July and September water temperatures (Burdick and Martin, 2017). In contrast, shortnose suckers had similar triglyceride concentrations and similar growth in 2015 and 2014 (Burdick and Martin, 2017).…”

Section: Discussionmentioning

confidence: 97%

“…Juvenile suckers in Upper Klamath Lake grow rapidly throughout August and September each year, but growth slows in October (Bottcher and Burdick, 2010;Burdick and Brown, 2010;Burdick and Martin, 2017). Energy stored as triglycerides appears to remain constant or to increase throughout the summer for these suckers (Foott and others, 2012;Burdick, Elliott and others, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…Most larval suckers drifting in these rivers reach Upper Klamath Lake, where they can feed freely and food is abundant, within a day after they emerge from the gravel (Cooperman and Markle, 2003). Age-0 juvenile suckers are then captured throughout Upper Klamath Lake until late August or early September, when catches decrease in most years (Burdick and Martin, 2017). Despite intensive sampling throughout Upper Klamath Lake and in the lower reaches of the lake's tributaries and at the outlet of the lake, age-1 endangered sucker captures are uncommon, and older juveniles rarely are encountered in Upper Klamath Lake (Burdick and Martin, 2017).…”

Section: Introductionmentioning

confidence: 99%

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Health and condition of endangered young-of-the-year Lost River and Shortnose suckers relative to water quality in Upper Klamath Lake, Oregon, 2014–2015

Burdick¹,

Conway²,

Elliott³

et al. 2017

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Section: Discussioncontrasting

confidence: 52%

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Health and condition of endangered young-of-the-year Lost River and Shortnose suckers relative to water quality in Upper Klamath Lake, Oregon, 2014–2015

Burdick¹,

Conway²,

Elliott³

et al. 2017

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Effect of Temperature on Survival of Lost River Suckers with a Natural Infection of Ichthyobodo spp.

et al. 2021

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To compensate for low natural survival of endangered Lost River Suckers Deltistes luxatus, the U.S. Fish and Wildlife Service and the Klamath Tribes have initiated captive rearing programs. We conducted laboratory experiments intended to determine the temperature for optimum growth of juvenile Lost River Suckers; however, due to an unanticipated infection with Ichthyobodo spp., we instead estimated survival in conjunction with temperature and parasite loads. Ichthyobodo spp. are common parasites that infest fish skin and gills; they are known to be present in Upper Klamath Lake and have been found in fish at both the federal and tribal fish‐rearing facilities. All fish held at mean temperatures of 16°C and 19°C survived the entire 65‐d experiment, whereas the median time to death was 27 d at 22°C, 8 d at 24°C, and 7 d at 26°C. Gill samples from all Lost River Suckers tested positive for Ichthyobodo spp. DNA, with a trend toward higher copy numbers in suckers that were held at a mean temperature of 22°C or warmer compared to those held at 19°C or cooler. Fish kept at all temperatures grew slowly. These results suggest that survival of Lost River Suckers with a natural infection of Ichthyobodo spp. was significantly impacted by temperature.

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Avian Predation on Juvenile and Adult Lost River and Shortnose Suckers: An UpdatedMulti‐PredatorSpecies Evaluation

Evans

Payton

Banet

et al. 2022

N American J Fish Manag

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Previous research suggests that predation by piscivorous colonial waterbirds may negatively influence the survival of Lost River Suckers (LRS) Deltistes luxatus and Shortnose Suckers (SNS) Chasmistes brevirostris in the Upper Klamath Basin (UKB), USA. However, estimates of predation from past studies, which were based on suckers with PIT tags, represent minimum estimates of sucker mortality because analyses did not account for the proportion of tags that were consumed by birds and deposited beyond their breeding colony. To address this uncertainty, we fed PIT‐tagged suckers to American white pelicans Pelecanus erythrorhynchos to estimate deposition probabilities. A hierarchical Bayesian model was then used to estimate predation rates (percentage of available tagged fish that were consumed) on juvenile suckers that were released as part of the Sucker Assisted Rearing Program (SARP) and on wild juvenile and adult LRS and SNS during 2009–2020. Pelican deposition probabilities were estimated to be 0.47 (95% credible interval = 0.36–0.60), indicating that for every 100 tags consumed, 47 tags on average were deposited on breeding colonies by birds. Deposition‐corrected estimates of predation rates were approximately two times greater than those previously reported and ranged annually from 4.3% (95% credible interval = 2.9–6.7%) to 8.5% (6.3–12.7%) on SARP juvenile suckers, from 4.3% (0.9–13.2%) to 10.5% (3.8–24.5%) on wild juvenile suckers, and from 0.1% (<0.1–0.3%) to 7.2% (2.8–16.4%) on adult suckers, depending on species and location. Results suggest that predation by colonial waterbirds, although not the original cause of sucker declines, was a substantial source of sucker mortality in some years. Future studies should consider models that jointly estimate both predation and survival and models that include environmental factors that potentially influence sucker susceptibility to avian predators in the UKB.

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Inter-annual variability in apparent relative production, survival, and growth of juvenile Lost River and shortnose suckers in Upper Klamath Lake, Oregon, 2001–15

Cited by 19 publications

References 10 publications

Health and condition of endangered young-of-the-year Lost River and Shortnose suckers relative to water quality in Upper Klamath Lake, Oregon, 2014–2015

Health and condition of endangered young-of-the-year Lost River and Shortnose suckers relative to water quality in Upper Klamath Lake, Oregon, 2014–2015

Effect of Temperature on Survival of Lost River Suckers with a Natural Infection of Ichthyobodo spp.

Avian Predation on Juvenile and Adult Lost River and Shortnose Suckers: An UpdatedMulti‐PredatorSpecies Evaluation

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