Benthic and planktonic inorganic nutrient processing rates at the interface between a river and lake

Larson, James H.; Evans, Mary Anne; Fitzpatrick, Faith A.; Frost, Paul C.; Xenopoulos, Marguerite A.; James, William F.; Reneau, Paul C.

doi:10.1007/s10533-021-00821-8

Cited by 5 publications

(6 citation statements)

References 52 publications

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“…First, the higher prevalence of flushing in the backwater could reflect transport of phytoplankton from the main channel into the backwater. Backwater areas in Pool 8 of the UMR tend to have a lower chlorophyll‐a concentration than the main channel (Houser, 2016; Jankowski, 2022) as a result of high aquatic vegetation biomass that can outcompete phytoplankton for light and nutrients (Carhart et al., 2021; Larson et al., 2021). Thus, a flushing signal aligns with the idea that a large portion of the phytoplankton are delivered to the backwater from larger main channel sources (Manier et al., 2021).…”

Section: Discussionmentioning

confidence: 99%

River Geomorphology Affects Biogeochemical Responses to Hydrologic Events in a Large River Ecosystem

Waite

Jankowski

D.A.

et al. 2023

Water Resources Research

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Section: Discussionmentioning

confidence: 99%

River Geomorphology Affects Biogeochemical Responses to Hydrologic Events in a Large River Ecosystem

Waite

Jankowski

D.A.

et al. 2023

Water Resources Research

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“…Taken together, it may be that labile DP is both consumed by heterotrophic bacteria and serves as a nutrient source for primary producers at the rivermouth, whereas the more recalcitrant DOM and MP are simply transported from river to lake (i.e., the rivermouth is acting as a pipe, sensu Cole et al, 2007). Nutrient modeling of a Lake Michigan rivermouth (Fox River) suggests that it acts as a sink for SRP through microbial uptake (Larson et al, 2021), and it's possible that similar processes result loss of DP in the rivermouth. This shift in balance between production and consumption of DP and DOC is likely attributable to the distinct conditions that arise from mixing of lake water with river water (Larson et al, 2007(Larson et al, , 2021.…”

Section: Coupling Of Doc To Dop Across the River To Lake Transectmentioning

confidence: 99%

“…Nutrient modeling of a Lake Michigan rivermouth (Fox River) suggests that it acts as a sink for SRP through microbial uptake (Larson et al, 2021), and it's possible that similar processes result loss of DP in the rivermouth. This shift in balance between production and consumption of DP and DOC is likely attributable to the distinct conditions that arise from mixing of lake water with river water (Larson et al, 2007(Larson et al, , 2021.…”

Section: Coupling Of Doc To Dop Across the River To Lake Transectmentioning

confidence: 99%

“…While freshwater estuaries lack the strong salinity gradient of marine estuaries, the systems exhibit many similarities such as chemical gradients, tide/seiche regimes, and nutrient export to receiving waterbodies. Changes in nutrient dynamics, alongside dissolved organic carbon (DOC, measured in units of carbon) and dissolved organic matter (DOM) have been documented in freshwater rivermouths (Larson et al., 2014, 2020, 2021; Pearce et al., 2021, 2023). Nutrient and carbon dynamics in Great Lakes nearshore and rivermouth zones are influenced by seiche‐driven mixing, outwelling from coastal wetlands, precipitation and wind patterns, alongshore currents, thermal bars, gyres, upwelling/downwelling and storms (Bouchard, 2007; Gächter et al., 1974; He et al., 2006; León et al., 2005; Morrice et al., 2004; Rao & Schwab, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Transitions in Dissolved Organic Phosphorus and Dissolved Organic Carbon Across a Freshwater Estuary Gradient

King,

Frost,

Watson

et al. 2023

JGR Biogeosciences

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Despite the significant role that dissolved organic phosphorus (DOP) plays in ecosystem productivity, efforts to characterize inputs of phosphorus (P) into lakes have largely ignored P fractions complexed to dissolved organic matter (DOM). To address this gap, we characterized DOP and DOM along a transect of a Lake Erie tributary (Kettle Creek) from the headwaters to the rivermouth and into the nearshore and offshore central basin. DOM and DOP characteristics impart a chemical fingerprint that is useful for determining source and production in aquatic ecosystems. We analyzed DOM composition and concentration (DOC; organic carbon) in addition to DOP as phosphomonoesters (MP; predominantly terrestrial in origin) and phosphodiesters (DP; microbially‐produced), along with other water quality parameters. DOM and DOC within the river were relatively invariant. While there were no consistent trends in riverine MP and DP, an impoundment on the river appeared to act as a sink for some soluble P forms and a potential source of DP. At the rivermouth, we observed a rapid decrease in DOC, DOP, and total P and a shift to more autochthonous‐like DOM, though the decrease in DP was weaker. Relative to in‐flowing river water, P pools in nearshore and offshore Lake Erie were enriched in DOP, especially DP. DOP accounted for up to 42% of total P in Kettle Creek and up to 92% in Lake Erie's central basin. Our work shows the importance of considering DOP in P management efforts as its dynamics differ from those of other, more commonly measured P forms.

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“…21 Most recently, combining with machine learning, 22 groundwater discharge from the lake floor, 23 and the contributions of wastewater treatment technologies were incorporated and quantified in the models for N and P removal. 24 The influence of river mouths, the loads of N and P from a tributary to the nearshore zone of a lake 25 and storm-based nutrient loss were also incorporated for the estimate of runoff and soil loss. 26 Lake Chaohu in Anhui Province is the fifth largest shallow freshwater lake in China.…”

Section: Introductionmentioning

confidence: 99%

Long-Term Agronomic Practices in Reducing Nitrogen and Phosphorus Loss from Intensive Croplands

Luo

Wang

et al. 2022

ACS Earth Space Chem.

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Eutrophication is increasing with intensive agricultural activities as a global environmental challenge, especially in developing countries. In order to establish the effects of long-term reducing fertilization and straw returning on nitrogen (N) and phosphorus (P) loss in surface runoff due to intensive cultivation in the Yangtze River basin, China, we conducted a 7-year field pilot experiment with rice-wheat rotation in the fifth largest fresh water lake basin. The treatments included no fertilization (CK), conventional fertilization (Conv. Fert.), optimized fertilization (Optim. Fert.), nitrogen reduction by 30% (70%N), P reduction by 50% (50%P), and N reduction by 30% and P reduction by 50% + straw returning (70%N50%P+Straw). Results showed that the average wheat yields in reducing fertilizer treatments (70%N, 50%P, and 70%N50%P+Straw) slightly decreased by 1.21%, 5.26%, and 1.17%, respectively, compared to those with the optimized fertilizer, whereas average rice yields slightly increased by 3.71%, 0.64%, and 1.23%, respectively. However, the reducing fertilizer treatments (70%N50%P+Straw) significantly reduced the loss of N and P in surface runoff compared with Conv. Fert. and Optim. Fert. Total P and dissolved P in surface runoff water in rice seasons was predictable and modeled. The annual average N, P, and K fertilizer efficiency for rice-wheat rotation ranged in 21%–42%, 12%–38%, and 35%–53%, respectively. Considering the yields of rice and wheat along with eco-environmental benefits of reducing N and P loss in surface water, 70%N50%P+Straw treatment was the best treatment for Chaohu region. This long-term field study recommends the employment of the reduced chemical fertilizer by 30% N and 50% P in Chaohu basin for rice and wheat crops with the maximum reduction of runoff N and P and the highest fertilizer (N and P) efficiency with reasonable high crop yields. This is especially important for farmers in developing countries in achieving economical, ecological, and environmental benefits in sustainable modern agriculture to feed the increasing global populations.

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Benthic and planktonic inorganic nutrient processing rates at the interface between a river and lake

Cited by 5 publications

References 52 publications

River Geomorphology Affects Biogeochemical Responses to Hydrologic Events in a Large River Ecosystem

River Geomorphology Affects Biogeochemical Responses to Hydrologic Events in a Large River Ecosystem

Transitions in Dissolved Organic Phosphorus and Dissolved Organic Carbon Across a Freshwater Estuary Gradient

Long-Term Agronomic Practices in Reducing Nitrogen and Phosphorus Loss from Intensive Croplands

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