Spatial and temporal dynamics of cyanotoxins and their relation to other water quality variables in Upper Klamath Lake, Oregon, 2007-09

Eldridge, Sara L. Caldwell; Wood, Tamara M.; Echols, Kathy R.

doi:10.3133/sir20125069

Cited by 17 publications

(25 citation statements)

References 53 publications

(30 reference statements)

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“…Water quality in Upper Klamath Lake is strongly correlated with the bloom dynamics of the cyanobacterium A. flos-aquae (Eldridge, Wood, and Echols, 2012). One or two massive blooms of A. flos-aquae occur every year in Upper Klamath Lake from May to October (Eldridge, Wood, and Echols, 2012).…”

Section: Description Of Study Areamentioning

confidence: 99%

“…One or two massive blooms of A. flos-aquae occur every year in Upper Klamath Lake from May to October (Eldridge, Wood, and Echols, 2012). The first annual bloom starts with the increase in water temperature in May or June and ends with a period of A. flos-aquae senescence known as the "bloom crash" in July or early August in most years.…”

Section: Description Of Study Areamentioning

confidence: 99%

“…In Upper Klamath Lake, the extremely toxic microcystin-LR congener primarily is produced by Microcystis aeruginosa during the period when A. flos-aquae senesces (Carmichael and others, 2000;Eldridge, Wood, and Echols, 2012). The primary route of exposure to microcystins for fish is through their food and, to a lesser extent, the toxins also may be taken up in gills when there are high concentrations of dissolved microcystins in the water column (Carbis and others, 1996).…”

Section: Review Of Water-quality Effects On Juvenile Sucker Health Anmentioning

confidence: 99%

“…The loss of wetland habitat and overgrazing most likely contributed to nutrient loading and massive annual blooms of the blue-green cyanobacterium Aphanizomenon flosaquae in Upper Klamath Lake (National Research Council, 2004). During prolonged periods each summer, the algal community in Upper Klamath Lake is a near monoculture of A. flos-aquae (Eldridge, Wood, and Echols, 2012). Shoreline habitat also was altered in 1909 when large boulders were used to stabilize the eastern shore of the lake for the construction of the Southern Pacific Railroad (National Research Council, 2004).…”

Section: Description Of Study Areamentioning

confidence: 99%

“…During "bloom crash" periods, DO concentrations can be hypoxic (< 4 mg/L), pH stabilizes at around 7, and un-ionized ammonia can remain high (> 0.5 mg/L as NH3; Eldridge, Caldwell Eldridge, and others, 2012). Microcystin, a powerful hepatotoxin produced by the cyanobacterium Microcystis aeruginosa, also increases during the bloom crash, with concentrations peaking at greater than 40 parts per billion (ppb) in 2014 (Eldridge, Wood, and Echols, 2012;Burdick, Elliott and others, 2015). Each of these water-quality variables may independently affect the survival of juvenile suckers, or combinations of multiple variables near the thresholds of sucker tolerance may cause direct mortality.…”

Section: Description Of Study Areamentioning

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

Open-File Report

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Section: Description Of Study Areamentioning

confidence: 99%

Section: Description Of Study Areamentioning

confidence: 99%

Section: Review Of Water-quality Effects On Juvenile Sucker Health Anmentioning

confidence: 99%

Section: Description Of Study Areamentioning

confidence: 99%

Section: Description Of Study Areamentioning

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

Open-File Report

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Does release size into net‐pens affect survival of captively reared juvenile endangered suckers in Upper Klamath Lake?

Caldwell,

Burdick,

Krause

et al. 2023

N American J Fish Manag

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ObjectiveHigh juvenile mortality prevents recruitment into the adult populations of endangered Shortnose Sucker Chasmistes brevirostris and Lost River Sucker Deltistes luxatus in Upper Klamath Lake, Oregon. To address the lack of recruitment, the U.S. Fish and Wildlife Service implemented the Sucker Assisted Rearing Program (SARP). Managers developing the rearing program lack information about how length at release relates to survival. To determine how initial length affects survival of captively reared juvenile suckers, we introduced juvenile suckers from the SARP into three net‐pens in Upper Klamath Lake.MethodsThe juvenile suckers ranged from 102 to 284 mm standard length, and each fish was tagged with a passive integrated transponder (PIT) tag. Fish were monitored continuously by PIT antennas and mortality was inferred when movements ceased.ResultEstimated survival over 57 days was high in all net‐pens (0.79–1.00) and remained high at two net‐pens for 76 and 86 days. Adjusted survival curves resulting from a stratified Cox model with standard length as a covariate, indicated that length positively influenced predicted survival by as much as 41% at one site. During the study, pH and dissolved oxygen regularly exceeded no‐effect thresholds at two sites and briefly reached lethal thresholds at the same two sites but did not coincide with the observed mortalities. Slower growth and the lowest survival were observed at the third site, where water quality never exceeded thresholds.ConclusionA larger release size and the location of the net‐pen can improve the survivability of juvenile suckers in net‐pens in Upper Klamath Lake.

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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

show abstract

Spatial and temporal dynamics of cyanotoxins and their relation to other water quality variables in Upper Klamath Lake, Oregon, 2007-09

Cited by 17 publications

References 53 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

Does release size into net‐pens affect survival of captively reared juvenile endangered suckers in Upper Klamath Lake?

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

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