Nutrient and light limitation of reservoir phytoplankton in relation to storm-mediated pulses in stream discharge

Vanni, Michael J.; Andrews, Joshua; Renwick, William H.; González, María J.; Noble, Samanthia Jean

doi:10.1127/0003-9136/2006/0167-0421

Cited by 55 publications

(60 citation statements)

References 27 publications

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“…The epilimnion was defined as the surface through the deepest depth at which the dissolved oxygen remained >2 mg L (Knowlton and Jones 2000). Although NVSS concentration can increase due to windinduced sediment resuspension in shallow areas of a reservoir, it also increases greatly after large storms due to soil erosion and runoff (Vanni et al 2006). NVSS therefore provides a potentially useful indicator of catchment influence (Jones and Knowlton 2005), particularly in deeper areas where sediment resuspension has less influence.…”

Section: Sample Collection and Analysesmentioning

confidence: 99%

Predicting eutrophication status in reservoirs at large spatial scales using landscape and morphometric variables

Knoll¹,

Hagenbuch

Stevens

et al. 2015

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Aquatic ecosystem management requires knowledge of the links among landscape-level anthropogenic disturbances and aquatic ecosystem properties. With large catchment area to surface area ratios (CA:SA), reservoirs often receive substantial terrestrial subsidies and can be particularly sensitive to eutrophication. Reservoir numbers and attendant management problems are increasing, and tools are needed to categorize their eutrophication status. We analyzed a dataset of 109 reservoirs in Ohio (USA) in an effort to classify eutrophication status using landscape-level features and reservoir morphometry. These predictor variables were selected because they are relatively stable and easily measured. We employed regression tree analysis and used a composite eutrophication variable as our response variable. Our regression tree analysis accurately divided 67% of Ohio reservoirs into 4 eutrophication status groups using 3 predictor variables: percentage of catchment area composed of agriculture versus forest; maximum reservoir depth; and CA:SA. We can infer that reservoirs with catchments containing >71% forest will likely be oligotrophic to mesotrophic. For reservoirs with <71% catchment forest, trophic status is determined by the relative extent of catchment row crops and either CA:SA or maximum depth. We applied our regression tree to a subset of reservoirs in the Environmental Protection Agency's National Lakes Assessment (NLA; n = 339 reservoirs). With a few exceptions, we categorized NLA reservoirs by eutrophication status despite their broad geographical range across the contiguous USA. Our results show that a few easily measured, stable parameters can classify reservoir eutrophication status. Models like ours may be useful for broad-scale management decisions.

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Section: Sample Collection and Analysesmentioning

confidence: 99%

Predicting eutrophication status in reservoirs at large spatial scales using landscape and morphometric variables

Knoll¹,

Hagenbuch

Stevens

et al. 2015

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show abstract

“…We corrected for allochthonous contamination of seston using concentrations of nonvolatile suspended solids (NVSS) in lake water. During storms that cause runoff of allochthonous sediments, NVSS concentrations and loads increase greatly in inflow streams (Vanni et al 2001), and this leads to a large increase in reservoir NVSS concentration just after storm events (e.g., Vanni et al 2006a). Although NVSS is composed of inorganic particles, we hypothesized that NVSS concentrations and loads are correlated with those of allochthonous particulate organic carbon (POC).…”

Section: Phytoplankton and Watermentioning

confidence: 99%

“…However, such experiments alter some potentialv www.esajournals.org ly important conditions that might change phytoplankton species composition, and hence dD relative to that of lake phytoplankton. For example, these experiments typically exclude grazers and do not allow for episodic nutrient inputs, which are common in our reservoir ecosystems (Vanni et al 2006a), possibly leading to changes in algal species composition. This is potentially problematic because studies in streams show that different algal groups can vary substantially in dD within the same stream (Doucett et al 2007, Finlay et al 2010.…”

Section: Limitations and Sources Of Uncertaintymentioning

confidence: 99%

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Terrestrial support of detritivorous fish populations decreases with watershed size

2011

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Abstract. Consumers in aquatic food webs can be supported by terrestrial and aquatic primary production. However, we know little about how allochthony, i.e., the proportion of consumer biomass derived from terrestrial organic matter, varies along environmental gradients. Using hydrogen isotopes (deuterium), we quantified allochthony of an ecologically dominant detritivorous fish species (gizzard shad, Dorosoma cepedianum) in reservoir ecosystems, along a gradient of watershed land use (agriculture vs. forest). We predicted that allochthony would decline with an increase in the proportion of watershed land composed of agriculture (% agriculture). This is based on the supposition that as % agriculture increases, so does the export of dissolved inorganic nutrients to lakes, stimulating algal production and reducing the importance of terrestrial organic carbon subsidies. Allochthony accounted for ;34% of gizzard shad production (mean of 11 lakes), although this fraction varied greatly (0-68%) among lakes and isotope mixing model assumptions. Contrary to our hypothesis, we found no relationship between allochthony and % agriculture. However, allochthony was inversely related to total watershed area, as well as the absolute area of the watershed (rather than the percentage) composed of agriculture. We speculate that watershed area and allochthony are negatively correlated because watershed area exerts a strong control on the relative subsidies of dissolved inorganic nutrients vs. particulate organic carbon. Gizzard shad biomass was positively related to phytoplankton primary production but negatively related to allochthony, suggesting that phytodetritus is a higher quality resource than terrestrial detritus. Overall, our results show that both autochthonous and allochthonous carbon fuel the production of this ecologically important detritivore, the relative importance of allochthony decreases with increasing watershed size, and variation in gizzard shad production is closely tied to variation in autochthonous primary production.

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“…The magnitude, timing, and composition of storm-mediated discharge events can affect biogeochemical processes in water bodies (Vanni et al 2006), but also proliferation of toxic cyanobacteria (e.g. Planktothrix rubescens) which appears when lake warming and higher N:P ratios occur simultaneously (Posch et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Change in nutrient loading pattern due to coupled effect of change in concentration and hydroclimatic forces

Shafiei

McLoughlin

2017

Journal of Freshwater Ecology

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Increase in nutrient loading into large riverine systems is of interest because of long-lasting negative effects on downstream water bodies. We know little of this phenomenon with respect to long-term relationships between water quality metrics and trends in river flow. Here we present a multi-decadal examination of nutrient transport patterns of the South Saskatchewan and Red Deer Rivers, Canada. Using a multimethod approach, we show a slightly increasing trend in annual volume of water reaching a mid-watershed reservoir (Lake Diefenbaker) concomitant with a change in seasonal variability of flow events from the 1970s. Both total nitrogen (TN) and total phosphorus (TP) flux increased during the period of record. TN concentration increased, while TP concentration decreased. On average, the high-flow season transported 95% of annual TP flux, 75% of annual TN flux, and 65% of annual flow. Inter-annually, high-flow season contributions decreased with respect to water volume, but increased with respect to both TN and TP flux. We believe that changes in variability but also timing of hydroclimatic forces are responsible for observed patterns. Higher flows and more precipitation during the high-flow season are most likely responsible for increasing nutrient load regardless of overall decreases in nutrient concentration.

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Nutrient and light limitation of reservoir phytoplankton in relation to storm-mediated pulses in stream discharge

Cited by 55 publications

References 27 publications

Predicting eutrophication status in reservoirs at large spatial scales using landscape and morphometric variables

Predicting eutrophication status in reservoirs at large spatial scales using landscape and morphometric variables

Terrestrial support of detritivorous fish populations decreases with watershed size

Change in nutrient loading pattern due to coupled effect of change in concentration and hydroclimatic forces

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