Water-quality data from Upper Klamath and Agency Lakes, Oregon, 2009-10

Eldridge, D. Blake; Eldridge, Sara L. Caldwell; Schenk, Liam N.; Tanner, Dwight Q.; Wood, Tamara M.

doi:10.3133/ofr20121142

Cited by 9 publications

(10 citation statements)

References 5 publications

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“…; Eldridge et al. ). The death of A. flos‐aquae makes dissolved nitrogen available for non‐nitrogen‐fixing, toxigenic cyanobacteria, including Microcystis aeruginosa (Caldwell Eldridge et al.…”

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confidence: 98%

“…High pH cooccurs with high DO and low un-ionized ammonia, whereas low pH co-occurs with low DO, high total ammonia, and low un-ionized ammonia (Power 1997;Lindenberg et al 2008). Maximum annual un-ionized ammonia concentrations from 2003 to 2018 were 0.20 mg/L or less (Lindenberg et al 2008;Eldridge et al 2012). The death of A. flos-aquae makes dissolved nitrogen available for non-nitrogen-fixing, toxigenic cyanobacteria, including Microcystis aeruginosa (Caldwell Eldridge et al 2013).…”

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confidence: 99%

“…During the bloom‐crash period, site‐specific instances of low (<2‐mg/L) DO concentrations may occur, lasting several hours to several days; pH decreases to around 7; and total ammonia rapidly increases to around 1 mg/L as the bloom crashes (Morace ; Eldridge et al. ). The percentage of total ammonia (NH 3 + NH 4+ ) in the un‐ionized form increases with high pH.…”

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confidence: 99%

“…High temperatures (>22°C) and persistently low wind speeds cause multi-day lake stratification that results in a "bloom-crash" of A. flos-aquae (Kann and Welch 2005). During the bloom-crash period, site-specific instances of low (<2-mg/L) DO concentrations may occur, lasting several hours to several days; pH decreases to around 7; and total ammonia rapidly increases to around 1 mg/L as the bloom crashes (Morace 2007;Eldridge et al 2012). The percentage of total ammonia (NH 3 + NH 4+ ) in the un-ionized form increases with high pH.…”

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confidence: 99%

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Mortality of Endangered Juvenile Lost River Suckers Associated with Cyanobacteria Blooms in Mesocosms in Upper Klamath Lake, Oregon

et al. 2020

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Unsustainably high mortality within the first 2 years of life prevents endangered Lost River Suckers Deltistes luxatus in Upper Klamath Lake, Oregon, from recruiting to spawning populations. Massive blooms of the cyanobacterium Aphanizomenon flos-aquae and their subsequent death and decay in the lake (bloom-crashes) are associated with high pH, low percent oxygen saturation, high total ammonia concentrations, and spikes in the cyanotoxin microcystin. Poor water quality within the lake is considered the most likely cause of juvenile sucker mortality, but mechanisms causing the high mortality are not known. We introduced PIT-tagged age-1 Lost River suckers into three continuously monitored mesocosms in Upper Klamath Lake to determine the timing of juvenile sucker mortality relative to pH, temperature, and dissolved oxygen. Mortality was inferred from a lack of movement detected on remote PIT tag detection equipment within each mesocosm. Mortality was compared among mesocosms and an indoor tank-held control group. We fitted time-varying Cox hazard models to test hypotheses about short-term and chronic effects of single

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confidence: 98%

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confidence: 99%

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confidence: 99%

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confidence: 99%

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Mortality of Endangered Juvenile Lost River Suckers Associated with Cyanobacteria Blooms in Mesocosms in Upper Klamath Lake, Oregon

et al. 2020

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“…The timing of algal blooms was also associated with longitudinal position; bloom development occurred earlier in the summer at more upstream sites. Algal bloom dynamics that most markedly affect water quality in UKL typically peak in June and July, and then abate in September through October [Eldridge et al, 2012;Wood et al, 2006]. Across all sites, the highest concentrations of Chl a and Ph-a occurred during the bloom period, while the postbloom period exhibited the highest temperatures, highest pH, and lowest DO.…”

Section: Hydrology and Water Qualitymentioning

confidence: 99%

Impact of seasonality and anthropogenic impoundments on dissolved organic matter dynamics in the Klamath River (Oregon/California, USA)

Oliver

Spencer

Deas³

et al. 2016

JGR Biogeosciences

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Rivers play a major role in the transport and processing of dissolved organic matter (DOM). Disturbances that impact DOM dynamics, such as river impoundments and flow regulation, have consequences for biogeochemical cycling and aquatic ecosystems. In this study we examined how river impoundments and hydrologic regulation impact DOM quantity and quality by tracking spatial and seasonal patterns of DOM in a large, regulated river (Klamath River, USA). Dissolved organic carbon (DOC) concentrations decreased downstream and longitudinal patterns in DOC load varied by season. Export of DOM (as DOC) was largely driven by river flow, while DOM composition was strongly influenced by impoundments. Seasonal algal blooms in upstream lentic reaches provided a steady source of algal DOM that was processed in downstream reaches. DOM at upstream sites had an average spectral slope ratio (SR) > 1, indicating algal‐derived material, but decreased downstream to an average SR < 1, more indicative of terrestrial‐derived material. The increasingly terrestrial nature of DOM exported from reservoirs likely reflects degraded algal material that becomes increasingly more recalcitrant with distance from upstream source and additional processing. As a result, DOM delivered to free‐flowing river reaches below impoundments was less variable in composition. Downstream of impoundments, tributary influences resulted in increasing contributions of terrestrial DOM from the surrounding watershed. Removal of the four lower dams on the Klamath River is scheduled to proceed in the next decade. These results suggest that management should consider the role of impoundments on altering DOM dynamics, particularly in the context of dam removal.

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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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Water-quality data from Upper Klamath and Agency Lakes, Oregon, 2009-10

Cited by 9 publications

References 5 publications

Mortality of Endangered Juvenile Lost River Suckers Associated with Cyanobacteria Blooms in Mesocosms in Upper Klamath Lake, Oregon

Mortality of Endangered Juvenile Lost River Suckers Associated with Cyanobacteria Blooms in Mesocosms in Upper Klamath Lake, Oregon

Impact of seasonality and anthropogenic impoundments on dissolved organic matter dynamics in the Klamath River (Oregon/California, USA)

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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