Biological Effects of Fluctuating Water Levels in the Snake River, Grand Teton National Park, Wyoming

Kroger, Richard L.

doi:10.2307/2424055

Cited by 38 publications

(36 citation statements)

References 6 publications

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“…After the initial reduction only a few insects were stranded, but the second more drastic reduction resulted in considerably more insects being stranded, including large numbers of Rhithrogenu hageni Eaton. Kroger (1973) reported stranding of large numbers of R. hageni following a rapid reduction of water flow in a regulated river, In experimental channels, however, Baetis tricaudatus Dodds largely avoided stranding (Corrarino and Brusven, 1983). When flows were reduced from 0-57 to 0-28m3 s-I, there was little immediate effect on drift in B. tricaudutus, but the night-time peak increased.…”

Section: Reduced Discharge and Cessation Of Flowmentioning

confidence: 99%

A review of the effect of river regulation on mayflies (Ephemeroptera)

Brittain

Saltveit

1989

Regul. Rivers: Res. Mgmt.

109

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Impoundment and diversion of watercourses for power production and water supply can have profound effects on the mayfly fauna. To explain such effects a species-specific approach is adopted on account of differing habitat requirements and life histories in the order and even within genera. Environmental conditions such as discharge and flow patterns, temperature, food availability, and predation may be changed. This leads to changes in the density and species composition of the mayfly community, especially when there is a hypolimnion drain from reservoirs.Temperature changes below such reservoirs may remove obligatory life cycle thresholds. Prolonged periods of low discharge lead to the dominance of genera, such as Paraleptophlebia, Choroterpes, Siphlonurus, and Pseudodoen, typical of slow-flowing and lentic habitats.The life cycle plasticity and opportunism shown by Baetis rhodani in Europe and B. tricaudatus in North America have undoubtedly contributed to their success in regulated rivers. The life history characteristics of Tricoryth0de.s are also advantageous below dams. The increased growth of periphyton and mosses below many dams favour certain Ephemerellidae, but restrict or eliminate many Heptageniidae. In order to survive adverse conditions, flexible life cycles or a short period of rapid nymphal growth coupled with a long period of egg development, are advantageous.

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Section: Reduced Discharge and Cessation Of Flowmentioning

confidence: 99%

A review of the effect of river regulation on mayflies (Ephemeroptera)

Brittain

Saltveit

1989

Regul. Rivers: Res. Mgmt.

109

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“…The slope of the shoreline affects not only the area of substrate inundation for a given time interval, but also positively correlates with water velocity and depth, which have large influences on macroinvertebrate distribution and density. In addition, algal communities have been shown to become desiccated and die under fluctuating flows (Kroger 1973;Blinn et al 1995), and since many invertebrates feed on algae and associated bacteria and fungi, their numbers could be expected to be limited by the scarcity of attached periphyton. Brusven et al (1974) found that productive algal zones provided higher survival during dewatering and higher habitat complexity not present in the upper zone of fluctuation.…”

Section: Long-term Effects Of Dewateringmentioning

confidence: 99%

“…Several studies have found that fluctuations in flow can cause the stranding and reduction of fish-food organisms and young fish, thus reducing rearing capacity (Powell 1958;Phillips 1969). Studies on the upper Snake River, Idaho and Wyoming, found that resultant de-watering of benthic habitats not only caused substantial exposure and death to aquatic invertebrates, but this destruction of food organisms was also found to have detrimental effects on higher trophic levels (Kroger 1973). If macroinvertebrate abundance were reduced in the margins, then it could potentially affect chinook salmon that live and feed in the margins.…”

Section: Driftmentioning

confidence: 99%

“…Although highly variable, the survival of invertebrates generally continued to decline with increased duration of exposure. Many studies have found losses of invertebrates caused by decreasing discharges from power generating plants causing stranding (Fisher and LaVoy 1972;Kroger 1973;Extence 1981;Corrarino and Brusven 1983) and desiccation (Powell 1958;Pearson et.al. 1968) of macroinvertebrates in shallow shoreline areas.…”

Section: Artificial Exposuresmentioning

confidence: 99%

“…Brusven et al (1974) suggested that prolonged dewatering of the Hell's Canyon reach of the Snake River reduced primary production, causing a lag in recolonization of invertebrates when conditions again became favorable. Many studies indicate that fluctuating flows more severely impact the density and abundance of benthic invertebrates than fish (Kroger 1973;Brusven and McPhee 1976;and Haber et al 1978). Most benthic invertebrates are less mobile and more likely to encounter problems maintaining position or attachment on substrate during changes in discharge.…”

Section: An Investigation Of Fluctuating Flows Downstream Of Dworshakmentioning

confidence: 99%

See 2 more Smart Citations

Evaluation of Juvenile Fall Chinook Salmon Stranding on the Hanford Reach of the Columbia River, 1999 Annual Report.

Nugent¹

2002

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Abundance and nutritional status of freshwater turtles to guide delivery of environmental flows in the Murray‐Darling Basin, south‐eastern Australia

Francis

Brandis

Chessman

2022

Aquatic Conservation

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Almost half of Australian freshwater turtle species are formally listed as threatened, but little is known about the effects of water management and other factors on the abundance and health of freshwater turtles in arid and semi‐arid regions. This study investigated how river flows (including the controlled release of water from an upstream storage facility, or ‘environmental flow’) and water quality might affect the abundance and nutritional status of three freshwater turtle species in three dryland rivers of the Murray–Darling basin in south‐eastern Australia. No response in abundance or nutritional status of the broad‐shelled turtle, Chelodina expansa, the eastern long‐necked turtle, Chelodina longicollis, and the Macquarie turtle, Emydura macquarii, was detected in relation to river flows, possibly because of the small magnitude of the environmental flow. However, for C. expansa, the catch per unit effort (CPUE) was negatively related to increasing macrophyte cover, electrical conductivity (EC, an indicator of salinity), and turbidity. CPUE for C. longicollis was positively related to macrophyte cover and EC, and for E. macquarii it was positively related to macrophyte cover. Haematological measurements suggested that the turtles had healthy nutritional status. Body condition and blood glucose and protein were related significantly to EC, whereas haematological measurements varied significantly among species and between spring and summer. The main conclusion is that water management measures to help the conservation of these turtles should include sufficient environmental flow to produce overbank flooding, thereby creating and maintaining a wide range of habitat suitable for the differing needs of the individual species.

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Biological Effects of Fluctuating Water Levels in the Snake River, Grand Teton National Park, Wyoming

Cited by 38 publications

References 6 publications

A review of the effect of river regulation on mayflies (Ephemeroptera)

A review of the effect of river regulation on mayflies (Ephemeroptera)

Evaluation of Juvenile Fall Chinook Salmon Stranding on the Hanford Reach of the Columbia River, 1999 Annual Report.

Abundance and nutritional status of freshwater turtles to guide delivery of environmental flows in the Murray‐Darling Basin, south‐eastern Australia

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