Reservoir Rehabilitations: Seeking the Fountain of Youth

Pegg, Mark A.; Pope, Kevin L.; Powell, Larkin A.; Turek, Kelly C.; Spurgeon, Jonathan J.; Stewart, Nathaniel T.; Hogberg, Nick P.; Porath, Mark T.

doi:10.1080/03632415.2015.1017635

Cited by 18 publications

(15 citation statements)

References 22 publications

(19 reference statements)

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“…, Pegg et al. ). In these particular circumstances, the detection of a hump‐shaped pattern will be very unlikely because the depression phase will be replaced by a plateau or a slow decreasing trend in abundance.…”

Section: Discussionmentioning

confidence: 99%

“…Reservoir management actions such as fish stocking, fishing, and mitigation measures could also alter population trajectories and affect our ability to detect the TS. For example, one mitigation measure applied in some reservoirs is to add nutrients in the reservoir to delay the depression phase (Agostinho et al 1999, Pegg et al 2015. In these particular circumstances, the detection of a hump-shaped pattern will be very unlikely because the depression phase will be replaced by a plateau or a slow decreasing trend in abundance.…”

Section: Variation In the Trophic Surgementioning

confidence: 99%

“…), (2) the degree of alteration in the hydrological regime and reservoir management, including the magnitude and timing of drawdown, reservoir filling options, mitigation measures (Grimard and Jones , Pegg et al. ), (3) the land use and the amount of nutrient loading in the watershed (Ostrofsky , Grimard and Jones ), (4) the species life history traits and the strength of trophic interactions (Cherry and Guthrie ), and (5) other external factors such as stocking, species introductions, and fishing (Balon and Coche , Kimmel and Groeger , Pivnička , Costa‐Pierce , Tessier et al. ).…”

Section: Introductionmentioning

confidence: 99%

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Do novel ecosystems follow predictable trajectories? Testing the trophic surge hypothesis in reservoirs using fish

et al. 2016

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Hydroelectric reservoirs are novel ecosystems that provide a variety of important services. To manage these ecosystems and their fish populations effectively, we need to develop conceptual frameworks for predicting their short‐ and long‐term responses. To advance this goal, we revisited and tested the “trophic surge hypothesis, TSH.” The TSH has been widely cited in the literature, but has not been empirically tested across numerous reservoirs. The TSH suggests that fish populations should show a hump‐shaped pattern (i.e., the non‐equilibrium phase) after river impoundment. As such, we assembled 40 recruitment and 109 adult fish abundance time series from 19 species distributed across seven reservoirs from temperate and boreal regions, and applied curve fitting analyses and model selection. We found that the hump‐shaped pattern was the predominant pattern across individual time series, providing moderate support for the TSH. Fish recruitment increased substantially during reservoir filling and was followed by an increase in adult fish lagging 3–4 years behind. The non‐equilibrium phase was transient and lasted roughly eight years for recruits, whereas it could be much longer for adults. When time series were combined across regions and sites, the support for the TSH was weaker. However, we observed significant variability in the duration, timing, and magnitude of the surge across individual time series and found that the total flooded area was the most influential predictor to explain this variability. In conclusion, the TSH and related metrics can be a useful and general predictive framework to understand how fish populations may respond to impoundment. In particular, long‐term management recommendations could be short‐sighted if formulated before convincing evidence has emerged to show that the reservoir reached its new trophic equilibrium.

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Section: Discussionmentioning

confidence: 99%

Section: Variation In the Trophic Surgementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Do novel ecosystems follow predictable trajectories? Testing the trophic surge hypothesis in reservoirs using fish

et al. 2016

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“…Degradation of shorelines and nearshore areas through erosion, sedimentation, loss of submerged structure, and widespread substrate homogenization over time can decrease habitat complexity and is a common concern for reservoir managers (Allen and Aggus ; Miranda and Krogman ; Pegg et al. ). Decreasing habitat complexity can negatively affect fish communities (e.g., alter species composition and abundance), can reduce recruitment of fish species that support key recreational fisheries (Smokorowski and Pratt ; Carmignani and Roy ), and results in low species diversity in structurally simple mudflats (Hatcher et al.…”

mentioning

confidence: 99%

Assessing Establishment and Growth of Agricultural Plantings on Reservoir Mudflats

Norris

Hatcher

Colvin

et al. 2020

N American J Fish Manag

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Winter drawdowns in flood control reservoirs create expansive mudflats that lack the vegetation typical of littoral zones, which reduces the amount of structure available for fish habitat. This study investigated the feasibility of establishing agricultural plantings as a management action to ameliorate mudflats by providing structural cover following reservoir refilling. We tested cool-season annual grasses and clovers applied in several mixed and monoculture treatments that were sown on the mudflats of Enid Reservoir, Mississippi, during the winter drawdown in three consecutive years. Soil samples were taken for analysis of pH and macronutrients prior to planting. Plantings were monitored until the following spring to evaluate effectiveness of establishment through ground coverage, height, and stem density sampling. Plots were assigned a seeding treatment of either grasses (ryegrass Lolium spp. or triticale x Triticosecale sp.), clovers (balansa clover Trifolium michelianum or berseem clover Trifolium alexandrinum), or both (mixed plantings) or left as an unseeded control. Differences among plant treatments were assessed via repeated measures analysis of variance and differences among means evaluated with Tukey's honestly significant difference test. Soil productivity within the study area was poor all 3 years. Grasses germinated both when disked into the soil and when top sown, while clover only germinated when disked. Plots seeded with grasses performed better than control plots with respect to stem density, height, and ground coverage, while plots seeded with grass and clover mixtures performed better than control plots only with respect to height, and plots seeded with only clover did not perform significantly better than control plots. Results serve as an evaluation of the efficacy of agricultural plant establishment on the mudflats of a flood control reservoir, inform the direction of future research, and identify considerations regarding the application of agricultural plantings as a management tool to create fish habitat.

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“…It has long been conjectured that reservoirs differ in the chronological rate at which they manifest senescence (Pegg et al 2015), but so far no attempt has been made to find an indicator that performs better than years since impoundment. In gerontology and related fields, the term "functional age" has been used as a descriptive label for research efforts that have suggested that functional capabilities are likely to be more meaningful than mere chronological age for characterizing the senescing status of an individual.…”

Section: Discussionmentioning

confidence: 99%

Functional Age as an Indicator of Reservoir Senescence

Miranda

Krogman

2015

Fisheries

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It has been conjectured that reservoirs differ in the rate at which they manifest senescence, but no attempt has been made to find an indicator of senescence that performs better than chronological age. We assembled an indicator of functional age by creating a multimetric scale consisting of 10 metrics descriptive of reservoir environments that were expected to change directionally with reservoir senescence. In a sample of 1,022 U.S. reservoirs, chronological age was not correlated with functional age. Functional age was directly related to percentage of cultivated land in the catchment and inversely related to reservoir depth. Moreover, aspects of reservoir fishing quality and fish population characteristics were related to functional age. A multimetric scale to indicate reservoir functional age presents the possibility for management intervention from multiple angles. If a reservoir is functionally aging at an accelerated rate, action may be taken to remedy the conditions contributing most to functional age. Intervention to reduce scores of selected metrics in the scale can potentially reduce the rate of senescence and increase the life expectancy of the reservoir. This leads to the intriguing implication that steps can be taken to reduce functional age and actually make the reservoir grow younger.

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Reservoir Rehabilitations: Seeking the Fountain of Youth

Cited by 18 publications

References 22 publications

Do novel ecosystems follow predictable trajectories? Testing the trophic surge hypothesis in reservoirs using fish

Do novel ecosystems follow predictable trajectories? Testing the trophic surge hypothesis in reservoirs using fish

Assessing Establishment and Growth of Agricultural Plantings on Reservoir Mudflats

Functional Age as an Indicator of Reservoir Senescence

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