Variation in water residence time is the primary determinant of phytoplankton and zooplankton composition in a Pacific Northwest reservoir ecosystem (Lower Snake River, USA)

Beaver, John R.; Scotese, Kyle C.; Manis, Erin E.; Juul, Steve T.J.; Carroll, J. A.; Renicker, Thomas R.

doi:10.1127/rs/2015/0100

Cited by 16 publications

(11 citation statements)

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“…The high river flow in CNM, for instance, presents an average higher than 1.0 × 10 5 m 3 /s, velocity's higher than 0.5 m/s and maximal velocity up to 2.0 m/s in this stretch of the Amazon River. These features point towards a lower likelihood of passive or cumulative agents' permanence in the outflow (nutrients, or less pollutants); it would also allow greater ability to avoid eutrophication processes (algae blooming), even in case of severe environmental degradation [75,80,81]. In other words, the longer the water remains in the control volume, the greater the likelihood of passive flow agents remaining in the body of water.…”

Section: Discussionmentioning

confidence: 99%

Hydrodynamic Modeling and Simulation of Water Residence Time in the Estuary of the Lower Amazon River

Abreu

Barros

Brito

et al. 2020

Water

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Studies about the hydrodynamic behavior in the lower Amazon River remain scarce, despite their relevance and complexity, and the Water Residence Time (Rt) of this Amazonian estuary remains poorly unknown. Therefore, the present study aims to numerically simulate three seasonal Rt scenarios based on a calibrated hydrodynamic numerical model (SisbaHiA) applied to a representative stretch of the lower Amazon River. The following methodological steps were performed: (a) establishing experimental water flow in natural channels; (b) statistically test numerical predictions (tidal range cycles for different hydrologic periods); and (c) simulating velocity fields and water discharge associated with Rt numerical outputs of the hydrodynamic model varied from 14 ≤ Rt ≤ 22 days among different seasonal periods. This change has shown the significant influence of hydrologic period and geomorphological features on Rt. Rt, in its turn, has shown significant spatial heterogeneity, depending on location and stretch of the channels. Comparative analyses between simulated and experimental parameters evidenced statistical correlations higher than 0.9. We conclude that the generated Rt scenarios were consistent with other similar studies in the literature. Therefore, they depicted the applicability of the hydrodynamics to the conservation of the Amazonian aquatic ecosystem, as well as its relevance for biochemical and pollutant dispersion studies, which still remain scarce in the literature.

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Section: Discussionmentioning

confidence: 99%

Hydrodynamic Modeling and Simulation of Water Residence Time in the Estuary of the Lower Amazon River

Abreu

Barros

Brito

et al. 2020

Water

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“…In the Hudson River, Caraco et al () found phytoplankton declines with downstream travel linked to ingestion by invasive zebra mussels, but the effect was complex because the mussels also reduced turbidity, thereby increasing light penetration and enhancing conditions for primary productivity. In the Lower Snake River, Beaver et al () examined controls on plankton composition and determined that hydrodynamics were more important than nutrients in structuring the community. In contrast, Camacho et al () demonstrated the value of using a coupled hydrodynamic and water quality model to understand phytoplankton dynamics and investigate the impacts of different management strategies, and found that for the St Louis Bay estuary phytoplankton productivity was sensitive to nutrient concentrations.…”

Section: Discussionmentioning

confidence: 99%

A river‐scale Lagrangian experiment examining controls on phytoplankton dynamics in the presence and absence of treated wastewater effluent high in ammonium

Kraus

Carpenter

Bergamaschi

et al. 2017

Limnology & Oceanography

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Phytoplankton are critical component of the food web in most large rivers and estuaries, and thus identifying dominant controls on phytoplankton abundance and species composition is important to scientists, managers, and policymakers. Recent studies from a variety of systems indicate that ammonium (NH 1 4 ) in treated wastewater effluent decreases primary production and alters phytoplankton species composition. However, these findings are based mainly on laboratory and enclosure studies, which may not adequately represent natural systems. To test effects of effluent high in ammonium on phytoplankton at the ecosystem scale, we conducted whole-river-scale experiments by halting discharges to the Sacramento River from the regional wastewater treatment plant (WWTP), and used a Lagrangian approach to compare changes in phytoplankton abundance and species composition in the presence (1EFF) and absence (2EFF) of effluent. Over 5 d of downstream travel from 20 km above to 50 km below the WWTP, chlorophyll concentrations declined from 15-25 to 2.5 lg L 21 , irrespective of effluent addition. Benthic diatoms were dominant in most samples. We found no significant difference in phytoplankton abundance or species composition between 1EFF and 2EFF conditions. Moreover, greatest declines in chlorophyll occurred upstream of the WWTP where NH 1 4 concentrations were low. Grazing by clams and zooplankton could not account for observed losses, suggesting other factors such as hydrodynamics and light limitation were responsible for phytoplankton declines. These results highlight the advantages of conducting ecosystem-scale, Lagrangian-based experiments to understand the dynamic and complex interplay between physical, chemical, and biological factors that control phytoplankton populations.

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“…; Beaver et al . ). The general consequences of increasing residence time for the planktonic compartment vary according to the effective growth of planktonic populations as they travel through the area considered (Lucas & Thompson ).…”

Section: Shellfish Farming As a Driver Of The ‘Hydrodynamic’ Environmmentioning

confidence: 97%

Shellfish culture: a complex driver of planktonic communities

Hulot

Saulnier

Lafabrie

et al. 2018

Reviews in Aquaculture

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This review features recent updates on planktonic community alteration attributed to shellfish farming across three major drivers: predation, nutrient availability and the hydrodynamic environment. The grazing pressure generated by filter‐feeder communities (shellfish and epibionts) constitutes a ‘top‐down’ control of planktonic communities in aquaculture areas, inducing a significant depletion of planktonic organism concentration. By selecting larger cells during the filtration process, shellfish also favour smaller organisms in the water column, leading to the dominance of the latter. Direct excretion and the benthic alteration process tend to fertilise the water column and significantly stimulate primary production. The associated epibiont community particularly contributes to this regeneration process. The expected consequence of increasing nutrient availability is generally a planktonic shift in favour of small planktonic species. However, investigation on the relationship between planktonic structure and nutrient conditions has revealed a wide complexity and variability. Finally, all structures used in shellfish farming activities interact with water currents and tend to significantly increase the residence time of planktonic organisms inside shellfish farming areas. In grazing‐dominated systems, an increase in residence time tends to increase the exposure time of planktonic populations to detrimental conditions, reducing biomass and production. The general consequences of shellfish farming are a decrease in primary production in farming ecosystems, and a possible alteration of structure and functioning of planktonic communities. The implications of shellfish farming also appear to be quite different from other aquaculture activities such as fish farming, which tend to promote primary production leading to eutrophication process.

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Variation in water residence time is the primary determinant of phytoplankton and zooplankton composition in a Pacific Northwest reservoir ecosystem (Lower Snake River, USA)

Cited by 16 publications

References 0 publications

Hydrodynamic Modeling and Simulation of Water Residence Time in the Estuary of the Lower Amazon River

Hydrodynamic Modeling and Simulation of Water Residence Time in the Estuary of the Lower Amazon River

A river‐scale Lagrangian experiment examining controls on phytoplankton dynamics in the presence and absence of treated wastewater effluent high in ammonium

Shellfish culture: a complex driver of planktonic communities

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