Groundwater-derived nutrient and trace element transport to a nearshore Kona coral ecosystem: Experimental mixing model results

Prouty, Nancy G.; Swarzenski, Peter W.; Fackrell, Joseph K.; Johannesson, Karen H.; Palmore, C. Diane

doi:10.1016/j.ejrh.2015.12.058

Cited by 19 publications

(24 citation statements)

References 46 publications

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“…In other springs in the reef, the dissolution of carbonates was probably inhibited due to a lower admixture of fresh groundwater (Table 1). Besides chemical erosion, the presence of SGD can also result in reduction of coral cover and coral species diversity (Lirman et al 2003;Crook et al 2012;Amato et al 2016), which can be related to high nutrient inputs (Amato et al 2016), salinity stress (Lirman et al 2003;Shaish et al 2010), an increase in bioerosion rates (Prouty et al 2017;Lubarsky et al 2018), or a decrease in pH and an associated decrease in aragonite/calcite saturation (Crook et al 2012). SGD leads in some sites to an enrichment of nutrients in the surface water which can lead to reduced coral reef cover and diversity (Fabricius 2005).…”

Section: Discussionmentioning

confidence: 99%

“…Anthropogenic activities in coastal watersheds lead to elevated nutrient inputs into onshore groundwater which may then be transported via SGD into the adjacent coastal ocean (Valiela et al ). Some nutrients such as dissolved silicon (DSi) behave conservatively during transport from land through the coastal aquifer, the subterranean estuary, and the sediment–water interface, while other nutrients (e.g., nitrate, phosphate) often behave nonconservatively and are removed (Beck et al ) due to denitrification (An and Joye ; Addy et al ), sorptive processes (Charette and Sholkovitz , ), and/or the precipitation of minerals (Slomp and Van Cappellen ), or added due to nitrification (Rocha et al ; Erler et al ), or the release of colloid bound nutrients such as phosphate (Jordan et al ; Prouty et al ). In particular, the tropical islands of Indonesia may favor high nutrient fluxes via terrestrial SGD, because groundwater is often highly polluted with nutrients due to agriculture and a lack of sanitation systems.…”

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confidence: 99%

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Nutrient dynamics in submarine groundwater discharge through a coral reef (western Lombok, Indonesia)

Oehler

Bakti

Lubis

et al. 2019

Limnology & Oceanography

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Submarine groundwater discharge (SGD) from tropical volcanic islands locally transports significant amounts of terrestrial nutrients into the coastal ocean, which can affect sensitive coastal ecosystems such as coral reefs. In northwestern Lombok, terrestrial submarine groundwater discharges through several submarine springs at the seafloor into a coral reef. In order to understand the transport mechanisms of nutrients from land into the reef, we investigated nutrient fluxes via SGD within the area using a combination of different methods, including recharge estimates in the coastal catchment area, echosounder profiling of the seafloor, discharge measurements, and hydrochemical analyses (stable isotopes of water, radon, and nutrients). Different types of springs can be distinguished based on their morphology. One spring showed a “crater”‐shaped structure while other springs consisted of fissures. Recharge rates in the coastal catchment amounted to 5 L s−1, while discharge rates from the largest spring were 5 L s−1 for total SGD and 2.5 L s−1 for fresh SGD, which is similar to discharge rates from smaller onshore springs at the slopes of a volcano. SGD was in general a source of nutrients such as dissolved silicon (~ 226 mol d−1), phosphate (0.61 mol d−1), or total dissolved nitrogen (13.4 mol d−1). Nitrate concentrations varied among the different springs, probably due to different sources in the hinterland, transformations (e.g., denitrification), or biological uptake during transport from land into the ocean. As nitrate can considerably affect coral reef health, our findings suggest that especially nitrate should be monitored around submarine springs in Indonesia.

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Nutrient dynamics in submarine groundwater discharge through a coral reef (western Lombok, Indonesia)

Oehler

Bakti

Lubis

et al. 2019

Limnology & Oceanography

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“…The conditions and timing of nutrient delivery also can be an important factor, especially when the timing of DIN and DIP delivery corresponds to algal growth‐limitation by these nutrients [ Michalak et al ., ]. Nutrient‐rich groundwater discharge can provide an efficient source of nutrients for benthic algae as concentrations at the sediment interface will be higher relative to the more dilute adjoining water column [ Hagerthey and Kerfoot, ; Rosen , ; Prouty et al ., ; Anderson et al ., ]. As with marine nearshore environments, the sediment‐water interface near the lakeshore is known to host active microbial communities that generate reactive forms of nutrients [ Correll , ; Gumbricht , ].…”

Section: Introductionmentioning

confidence: 98%

“…Nutrient loads from surface water inflows to lakes typically are much greater than groundwater inflows, and more research has focused on nutrient inputs to lakes from surface water as compared to groundwater. However, there has been growing interest in the role groundwater plays in water and nutrient budgets in lakes [ Wachniew, and Różański , ; LaBaugh et al ., ; Rosenberry et al ., ; Lewandowski et al ., , Prouty et al ., ].…”

Section: Introductionmentioning

confidence: 99%

Nutrient processes at the stream‐lake interface for a channelized versus unmodified stream mouth

Niswonger

Naranjo

Smith

et al. 2017

Water Resources Research

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Inorganic forms of nitrogen and phosphorous impact freshwater lakes by stimulating primary production and affecting water quality and ecosystem health. Communities around the world are motivated to sustain and restore freshwater resources and are interested in processes controlling nutrient inputs. We studied the environment where streams flow into lakes, referred to as the stream‐lake interface (SLI), for a channelized and unmodified stream outlet. Channelization is done to protect infrastructure or recreational beach areas. We collected hydraulic and nutrient data for surface water and shallow groundwater in two SLIs to develop conceptual models that describe characteristics that are representative of these hydrologic features. Water, heat, and solute transport models were used to evaluate hydrologic conceptualizations and estimate mean residence times of water in the sediment. A nutrient mass balance model is developed to estimate net rates of adsorption and desorption, mineralization, and nitrification along subsurface flow paths. Results indicate that SLIs are dynamic sources of nutrients to lakes and that the common practice of channelizing the stream at the SLI decreases nutrient concentrations in pore water discharging along the lakeshore. This is in contrast to the unmodified SLI that forms a barrier beach that disconnects the stream from the lake and results in higher nutrient concentrations in pore water discharging to the lake. These results are significant because nutrient delivery through pore water seepage at the lakebed from the natural SLI contributes to nearshore algal communities and produces elevated concentrations of inorganic nutrients in the benthic zone where attached algae grow.

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“…Several cases studies have been approached using geochemical tools to quantify nutrient fluxes from groundwater discharge both in continental areas [4,9,18,19] or in islands [20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Nitrates in Groundwater Discharges from the Azores Archipelago: Occurrence and Fluxes to Coastal Waters

Cruz

Andrade

Pacheco³

et al. 2017

Water

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Abstract:Groundwater discharge is an important vector of chemical fluxes to the ocean environment, and as the concentration of nutrients is often higher in discharging groundwater, the deterioration of water quality in the receiving environment can be the result. The main objective of the present paper is to estimate the total NO 3 flux to coastal water bodies due to groundwater discharge in the volcanic Azores archipelago (Portugal). Therefore, 78 springs discharging from perched-water bodies have been monitored since 2003, corresponding to cold (mean = 14.9 • C) and low mineralized (47.2-583 µS/cm) groundwater from the sodium-bicarbonate to sodium-chloride water types. A set of 36 wells was also monitored, presenting groundwater with a higher mineralization. The nitrate content in springs range between 0.02 and 37.4 mg/L, and the most enriched samples are associated to the impact of agricultural activities. The total groundwater NO 3 flux to the ocean is estimated in the range of 5.23 × 10 3 to 190.6 × 10 3 mol/km 2 /a (∑ =~523 × 10 3 mol/km 2 /a), exceeding the total flux associated to surface runoff (∑ =~281 × 10 3 mol/km 2 /a). In the majority of the islands, the estimated fluxes are higher than runoff fluxes, with the exception of Pico (47.2%), Corvo (46%) and Faial (7.2%). The total N-NO 3 flux estimated in the Azores (~118.9 × 10 3 mol/km 2 /a) is in the lower range of estimates made in other volcanic islands.

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Groundwater-derived nutrient and trace element transport to a nearshore Kona coral ecosystem: Experimental mixing model results

Cited by 19 publications

References 46 publications

Nutrient dynamics in submarine groundwater discharge through a coral reef (western Lombok, Indonesia)

Nutrient dynamics in submarine groundwater discharge through a coral reef (western Lombok, Indonesia)

Nutrient processes at the stream‐lake interface for a channelized versus unmodified stream mouth

Nitrates in Groundwater Discharges from the Azores Archipelago: Occurrence and Fluxes to Coastal Waters

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