Hypolimnetic oxygenation in Twin Lakes, WA. Part II: Feeding ecology of a mixed cold- and warmwater fish community

Skinner, Megan M.; Moore, Barry; Swanson, Mark E.

doi:10.1080/10402381.2014.908438

Cited by 10 publications

(7 citation statements)

References 34 publications

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“…Higher oxygen concentrations in the hypolimnion enlarge suitable habitat for a large number of oxygendependent organisms such as zooplankton and fish (Doke et al 1995;Klumb et al 2004;Skinner et al 2014) and avoid fish kills by preventing the upwelling of anoxic hypolimnetic water (Müller and Stadelmann 2004). Enhanced oxygen availability also has major effects on many biogeochemical processes.…”

Section: Temperaturementioning

confidence: 99%

Artificial mixing to control cyanobacterial blooms: a review

et al. 2015

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Artificial mixing has been used as a measure to prevent the growth of cyanobacteria in eutrophic lakes and reservoirs for many years. In this paper, we give an overview of studies that report on the results of this remedy. Generally, artificial mixing causes an increase in the oxygen content of the water, an increase in the temperature in the deep layers but a decrease in the upper layers, while the standing crop of phytoplankton (i.e. the chlorophyll content per m 2 ) often increases partly due to an increase in nutrients entrained from the hypolimnion or resuspended from the sediments. A change in composition from cyanobacterial dominance to green algae and diatoms can be observed if the imposed mixing is strong enough to keep the cyanobacteria entrained in the turbulent flow, the mixing is deep enough to limit light availability and the mixing devices are well distributed horizontally over the lake. Both models and experimental studies show that if phytoplankton is entrained in the turbulent flow and redistributed vertically over the entire depth, green algae and diatoms win the competition over (colonial) cyanobacteria due to a higher growth rate and reduced sedimentation losses. The advantage of buoyant cyanobacteria to float up to the illuminated upper layers is eradicated in a wellmixed system.

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Section: Temperaturementioning

confidence: 99%

Artificial mixing to control cyanobacterial blooms: a review

et al. 2015

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“…Very few stocked fish survive the winter and the 2013 year class had a unique mark (adipose and pectoral fin clips) relative to previous year-classes (Cross et al 2015). Trout used in this study were reared on 4 mm EWOS® vita fish feed at the CCT Resident Fish Hatchery in Bridgeport, WA and released into the lake in April 2013 at an average weight of 426 g. After release, RBT typically feed on trichoptera and diptera larva, and Daphnia in the littoral zone of the lake until late June (Skinner et al 2014). High epilimnetic temperatures, exceeding 21 C, tend to confine RBT in deep hypolimnetic and pelagic waters from late June to early September (Moore et al 2014).…”

Section: Study Sitementioning

confidence: 99%

“…To maintain a relatively constant external temperature, RBT adjust their depth distributions throughout the sampling season (Moore et al 2014). When confined to the pelagic zone of the lake, RBT feed heavily on Golden Shiner (Notemigonus crysoleucas), Daphnia and larvae of the Chironomidae and Chaoboridae families (Skinner et al 2014).…”

Section: Study Sitementioning

confidence: 99%

“…Prior to their release in late April 2013, white muscle and liver samples were collected from 10 hatchery-reared RBT. After RBT were planted in North Twin Lake, RBT from the April 2013 stocking cohort were collected monthly from May-October 2013 using gillnets (Skinner et al 2014). Golden Shiner were collected with gillnets and via electro-fishing in May and August (Skinner et al 2014).…”

Section: Sample Collection and Processingmentioning

confidence: 99%

“…After RBT were planted in North Twin Lake, RBT from the April 2013 stocking cohort were collected monthly from May-October 2013 using gillnets (Skinner et al 2014). Golden Shiner were collected with gillnets and via electro-fishing in May and August (Skinner et al 2014). Tissue samples were dissected in the field, transported to the laboratory on ice, and frozen upon arrival.…”

Section: Sample Collection and Processingmentioning

confidence: 99%

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Estimating in situ isotopic turnover in Rainbow Trout (Oncorhynchus mykiss) muscle and liver tissue

Skinner

Cross

Moore

2016

Journal of Freshwater Ecology

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Stable isotope analysis (SIA) is a powerful tool for assessing food webs and diet. However, the underlying assumptions that stable isotope ratios in an organism's tissues reflect that of its present diet may be complicated by isotopic turnover and retention time. Quantification of in situ isotopic turnover of study organisms and different tissues via field studies is essential to inform scientifically sound food web and diet studies utilizing SIA. Rainbow Trout white muscle and liver tissue were collected monthly from North Twin Lake, Washington during the 2013 growing season. Using ANCOVAs, we estimated stable carbon retention time of 154 (95% CI: 106-224) and 292 (95% CI: 257-763) days for Rainbow Trout liver and white muscle, respectively. For nitrogen, we estimated a retention time of 186 (95% CI: 114-329) days for both white muscle and liver. Our analyses suggest longer isotopic retention times (and therefore slower isotope turnover rates) for adult fish in a natural system relative to those commonly reported in the literature. These findings can improve interpretation of SIA in future aquatic food web and diet studies involving adult coldwater fish in freshwater systems.

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