Growth, survival, and cohort formation of juvenile Lost River (Deltistes luxatus) and shortnose suckers (Chasmistes brevirostris) in Upper Klamath Lake, Oregon, and Clear Lake Reservoir, California—2020 monitoring report

Martin, Barbara A.; Kelsey, Caylen M.; Burdick, Summer M.; Bart, Ryan J.

doi:10.3133/ofr20221099

Cited by 3 publications

(2 citation statements)

References 45 publications

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“…Captively reared juvenile endangered Lost River and Shortnose suckers that were held in net‐pens survived through the seasonal poor water quality conditions in Upper Klamath Lake, whereas over‐summer survival of age‐0 wild Lost River and Shortnose suckers ≥45 mm SL in Upper Klamath Lake is near zero (Burdick and Martin 2017; Martin et al 2022). Even with a smaller size‐range of suckers (<120 mm SL), recent studies have documented over‐summer sucker survival rates much greater than zero in net‐pens (Hereford et al 2019; Burdick et al 2020a, 2021).…”

Section: Discussionmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

“…Most fish that are reared at the hatchery are released directly into Upper Klamath Lake. Few SARP fish have been detected postrelease (Martin et al 2022). However, over‐summer survival of age‐1 suckers has been demonstrated repeatedly in net‐pens (Hereford et al 2019; Burdick et al 2020a, 2021).…”

Section: Introductionmentioning

confidence: 99%

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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Relation between the relative abundance and collapse of Aphanizomenon flos-aquae and microbial antagonism in Upper Klamath Lake, Oregon

Underwood,

Hall,

Mumford

et al. 2024

FEMS Microbiology Ecology

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Aphanizomenon flos-aquae (AFA) is the dominant filamentous cyanobacterium that develops into blooms in Upper Klamath Lake, Oregon each year. During AFA bloom and collapse, ecosystem conditions for endangered Lost River and shortnose suckers deteriorate, thus motivating the need to identify processes that limit AFA abundance and decline. Here we investigate the relations between AFA and other members of the microbial community (photosynthetic and non-photosynthetic bacteria and archaea), how those relations impact abundance and collapse of AFA, and the types of microbial conditions that suppress AFA. We found significant spatial variation in AFA relative abundance during the 2016 bloom period using 16S rRNA sequencing. The Pelican Marina (PM) site had the lowest AFA relative abundance, and this was coincident with increased relative abundance of Candidatus Sericytochromatia, Flavobacterium, and Rheinheimera, some of which are known AFA antagonists. The AFA collapse coincided with phosphorus limitation relative to nitrogen and the increased relative abundance of Cyanobium and Candidatus Sericytochromatia, which outcompete AFA when dissolved inorganic nitrogen is available. The data collected in this study indicate the importance of dissolved inorganic nitrogen combined with microbial community structure in suppressing AFA abundance.

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Growth, survival, and cohort formation of juvenile Lost River (Deltistes luxatus) and shortnose suckers (Chasmistes brevirostris) in Upper Klamath Lake, Oregon, and Clear Lake Reservoir, California—2021–22 monitoring report

Martin,

Caldwell,

Krause

et al. 2024

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Growth, survival, and cohort formation of juvenile Lost River (Deltistes luxatus) and shortnose suckers (Chasmistes brevirostris) in Upper Klamath Lake, Oregon, and Clear Lake Reservoir, California—2020 monitoring report

Cited by 3 publications

References 45 publications

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

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

Relation between the relative abundance and collapse of Aphanizomenon flos-aquae and microbial antagonism in Upper Klamath Lake, Oregon

Growth, survival, and cohort formation of juvenile Lost River (Deltistes luxatus) and shortnose suckers (Chasmistes brevirostris) in Upper Klamath Lake, Oregon, and Clear Lake Reservoir, California—2021–22 monitoring report

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