Estimation of nearshore groundwater discharge and its potential effects on a fringing coral reef

Blanco, A. C.; Watanabe, Atsushi; Nadaoka, Kazuo; Motooka, Shunsuke; Herrera, Eugene C.; Yamamoto, Takahiro

doi:10.1016/j.marpolbul.2011.01.005

Cited by 41 publications

(20 citation statements)

References 29 publications

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“…When surface discharge returned to baseflow conditions (on the days prior to survey), reinvasion of the salt wedge at the sampling station mobilized the 222 Rn-rich pore water from the surface sediment as a result of buoyancy-driven mixing between the fresh pore water and the salt wedge (Santos et al 2012). (Garrison et al 2003;Kroeger et al 2007), on coral reefs (Blanco et al 2011), and on the continental shelf (Burnett et al 2007). In this study, the NO { 3 fluxes were in the upper range (river : SGD ratio , 3.3 3 10 22 ) in comparison with the nitrogen fluxes from other similar studies on coastal environments (river : SGD ratio of 0.5 : 11; see Table 4).…”

Section: Discussionsupporting

confidence: 42%

“…The SGD-derived NO { 3 fluxes exceeded that of the baseflow riverine NO { 3 fluxes (0.28-0.34 3 10 3 mol d 21 ) by an order of magnitude. Other researchers have also encountered SGD nitrogen fluxes higher than or comparable to riverine fluxes, not only in estuaries (Mei Liu et al 2011) but in bays (Garrison et al 2003;Kroeger et al 2007), on coral reefs (Blanco et al 2011), and on the continental shelf (Burnett et al 2007). In this study, the NO { 3 fluxes were in the upper range (river : SGD ratio , 3.3 3 10 22 ) in comparison with the nitrogen fluxes from other similar studies on coastal environments (river : SGD ratio of 0.5 : 11; see Table 4).…”

Section: Discussionmentioning

confidence: 99%

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Dynamics of groundwater‐derived nitrate and nitrous oxide in a tidal estuary from radon mass balance modeling

Wong

Grace

Cartwright

et al. 2013

Limnology & Oceanography

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Section: Discussionsupporting

confidence: 42%

Section: Discussionmentioning

confidence: 99%

Dynamics of groundwater‐derived nitrate and nitrous oxide in a tidal estuary from radon mass balance modeling

Wong

Grace

Cartwright

et al. 2013

Limnology & Oceanography

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“…Similarly high inputs of nutrients into coral reefs have been found on Shiraho Reef in Japan [ Blanco et al ., ] where inputs from SGD can increase nitrate concentrations to 20‐fold greater than baseline oceanic conditions, leading to changes in the Chl‐a concentrations by a factor of 4. These inputs can help to sustain coral reefs and may be an often overlooked input of new nutrients.…”

Section: Discussionmentioning

confidence: 99%

Nitrogen enrichment and speciation in a coral reef lagoon driven by groundwater inputs of bird guano

McMahon

Santos

2017

JGR Oceans

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While the influence of river inputs on coral reef biogeochemistry has been investigated, there is limited information on nutrient fluxes related to submarine groundwater discharge (SGD). Here, we investigate whether significant saline groundwater‐derived nutrient inputs from bird guano drive coral reef photosynthesis and calcification off Heron Island (Great Barrier Reef, Australia). We used multiple experimental approaches including groundwater sampling, beach face transects, and detailed time series observations to assess the dynamics and speciation of groundwater nutrients as they travel across the island and discharge into the coral reef lagoon. Nitrogen speciation shifted from nitrate‐dominated groundwater (>90% of total dissolved nitrogen) to a coral reef lagoon dominated by dissolved organic nitrogen (DON; ∼86%). There was a minimum input of nitrate of 2.1 mmol m−2 d−1 into the lagoon from tidally driven submarine groundwater discharge estimated from a radon mass balance model. An independent approach based on the enrichment of dissolved nutrients during isolation at low tide implied nitrate fluxes of 5.4 mmol m−2 d−1. A correlation was observed between nitrate and daytime net ecosystem production and calcification. We suggest that groundwater nutrients derived from bird guano may offer a significant addition to oligotrophic coral reef lagoons and fuel ecosystem productivity and the coastal carbon cycle near Heron Island. The large input of groundwater nutrients in Heron Island may serve as a natural ecological analogue to other coral reefs subject to large nutrient inputs from anthropogenic sources.

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“…SGD also contributes significantly to reef productivity and/or calcification (Kamermans et al, 2002;Greenwood et al, 2013;McMahon and Santos, 2017). In a coastal water column, phytoplankton community structure was shown to be altered by SGD (Troccoli-Ghinaglia et al, 2010;Blanco et al, 2011;Adolf et al, 2019). More recently, a direct relationship between SGD and in situ phytoplankton primary productivity in nearshore coastal areas in Japan was found (Sugimoto et al, 2017).…”

Section: Bio-ecological Processesmentioning

confidence: 99%

Submarine Groundwater Discharge: Updates on Its Measurement Techniques, Geophysical Drivers, Magnitudes, and Effects

Taniguchi

Dulai

Burnett

et al. 2019

Front. Environ. Sci.

207

143

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The number of studies concerning Submarine Groundwater Discharge (SGD) grew quickly as we entered the twenty-first century. Many hydrological and oceanographic processes that drive and influence SGD were identified and characterized during this period. These processes included tidal effects on SGD, water and solute fluxes, biogeochemical transformations through the subterranean estuary, and material transport via SGD from land to sea. Here we compile and summarize the significant progress in SGD assessment methodologies, considering both the terrestrial and marine driving forces, and local as well as global evaluations of groundwater discharge with an emphasis on investigations published over the past decade. Our treatment presents the state-of-the-art progress of SGD studies from geophysical, geochemical, bio-ecological, economic, and cultural perspectives. We identify and summarize remaining research questions, make recommendations for future research directions, and discuss potential future challenges, including impacts of climate change on SGD and improved estimates of the global magnitude of SGD.

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Estimation of nearshore groundwater discharge and its potential effects on a fringing coral reef

Cited by 41 publications

References 29 publications

Dynamics of groundwater‐derived nitrate and nitrous oxide in a tidal estuary from radon mass balance modeling

Dynamics of groundwater‐derived nitrate and nitrous oxide in a tidal estuary from radon mass balance modeling

Nitrogen enrichment and speciation in a coral reef lagoon driven by groundwater inputs of bird guano

Submarine Groundwater Discharge: Updates on Its Measurement Techniques, Geophysical Drivers, Magnitudes, and Effects

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