Watershed discharge patterns, secondary consumer abundances, and seagrass habitat condition in Yap, Micronesia

Houk, Peter; Golbuu, Yimnang; Gorong, Berna; Gorong, Thomas; Fillmed, Christina

doi:10.1016/j.marpolbul.2013.03.012

Cited by 9 publications

(5 citation statements)

References 36 publications

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“…In addition, tidally-driven groundwater into nearshore ecosystems was found to be negatively correlated with seagrass habitat condition (Houk et al, 2013). Nutrients loads via groundwater discharge may affect the community structure to move towards macroalgal blooms via bottom-up control (Lapointe, 1997) and likely play a role in the displacement of slow-growing benthic flora with fast-growing species observed in Sanya Bay in the last two decades (Titlyanov et al, 2015).…”

Section: Seasonal and Regional Extrapolations And Expectationsmentioning

confidence: 99%

Tidal variability of nutrients in a coastal coral reef system influenced by groundwater

Wang¹,

Wang²,

Wang³

et al. 2017

Preprint

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Abstract. To investigate variations in nitrite, nitrate, phosphate and silicate in a spring-neap tide in a coral reef system influenced by groundwater discharge, we carried out a time-series observation of these nutrients and and 2.68 M, respectively. Nitrate and phosphate were negatively correlated with water depth during the spring tide, but showed no correlation during the neap tide. Nitrite was positively correlated with water depth in the spring and neap tide.They were also significantly correlated with salinity at the ebb flow of the spring tide. We quantified variations in oxidized nitrogen (NO x ) and phosphate contributed by biological processes based on mixing lines of these nutrients. During both the spring and neap tide biologically contributed NO x and phosphate were significantly correlated with regression slopes of 4.60 20 in the spring tide and 13.37 in the neap tide, similar to the composition of these nutrients in the water column, 5.43 and 14.18, respectively. This similarity indicates that the composition of nutrients in the water column of the reef system was closely related with biological processes during both tidal periods, but the biological influence appeared to be less as inferred from the less significant correlations during the spring tide when groundwater discharge was more prominent.

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Section: Seasonal and Regional Extrapolations And Expectationsmentioning

confidence: 99%

Tidal variability of nutrients in a coastal coral reef system influenced by groundwater

Wang¹,

Wang²,

Wang³

et al. 2017

Preprint

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“…In addition, groundwater tidally driven into nearshore ecosystems was found to be negatively correlated with seagrass habitat conditions (Houk et al, 2013). Nutrient loads via groundwater discharge may affect the community structure to move towards macroalgal blooms via bottom-up control (Lapointe, 1997) and likely play a role in the displacement of slow-growing benthic flora with fast-growing species observed in Sanya Bay in the last two decades (Titlyanov et al, 2015).…”

Section: Seasonal and Regional Extrapolationsmentioning

confidence: 99%

“…Groundwater input to coral reefs has been shown to be globally important and carry a significant amount of terrestrially derived nutrients to the reef systems (D'Elia et al, 1981;Paytan et al, 2006;Houk et al, 2013). Groundwater discharge is usually enriched in N relative to P with an N : P ratio higher than the Redfield ratio, 16 : 1 (Redfield, 1960), because of more efficient immobilization of P than N in coastal aquifers (Slomp and Van Cappellen, 2004).…”

Section: Introductionmentioning

confidence: 99%

Tidal variability of nutrients in a coastal coral reef system influenced by groundwater

Wang

et al. 2018

Biogeosciences

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Abstract. To investigate variation in nitrite, nitrate, phosphate, and silicate in a spring-neap tide in a coral reef system influenced by groundwater discharge, we carried out a timeseries observation of these nutrients and 228 Ra, a tracer of groundwater discharge, in the Luhuitou fringing reef at Sanya Bay in the South China Sea. The maximum 228 Ra, 45.3 dpm 100 L −1 , appeared at low tide and the minimum, 14.0 dpm 100 L −1 , appeared during a flood tide in the spring tide. The activity of 228 Ra was significantly correlated with water depth and salinity in the spring-neap tide, reflecting the tidal-pumping feature of groundwater discharge. Concentrations of all nutrients exhibited strong diurnal variation, with a maximum in the amplitude of the diel change for nitrite, nitrate, phosphate, and silicate in the spring tide of 0.46, 1.54, 0.12, and 2.68 µM, respectively. Nitrate and phosphate were negatively correlated with water depth during the spring tide but showed no correlation during the neap tide. Nitrite was positively correlated with water depth in the spring and neap tide due to mixing of nitrite-depleted groundwater and nitrite-rich offshore seawater. They were also significantly correlated with salinity (R 2 ≥ 0.9 and P < 0.05) at the ebb flow of the spring tide, negative for nitrate and phosphate and positive for nitrite, indicating the mixing of nitritedepleted, nitrate-and phosphate-rich less saline groundwater and nitrite-rich, nitrate-and phosphate-depleted saline offshore seawater. We quantified variation in oxidized nitrogen (NO x ) and phosphate contributed by biological processes based on deviations from mixing lines of these nutrients. During both the spring and neap tide biologically contributed NO x and phosphate were significantly correlated with regression slopes of 4.60 (R 2 = 0.16) in the spring tide and 13.4 (R 2 = 0.75) in the neap tide, similar to the composition of these nutrients in the water column, 5.43 (R 2 = 0.27) and 14.2 (R 2 = 0.76), respectively. This similarity indicates that the composition of nutrients in the water column of the reef system was closely related with biological processes during both tidal periods, but the biological influence appeared to be less dominant, as inferred from the less significant correlations (R 2 = 0.16) during the spring tide when groundwater discharge was more prominent. Thus, the variability of nutrients in the coral reef system was regulated mainly by biological uptake and release in a spring-neap tide and impacted by mixing of tidally driven groundwater and offshore seawater during spring tide.

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“…In relatively oligotrophic coastal systems with coral reefs, such groundwater-associated nutrient fluxes may sustain the reef community production (Cuet et al, 2011), result in increases in diversity and occurrence of algae and sponge where relatively low salinity is present (Houk and Starmer, 2010), or induce the proliferation of diatom and cyanobac-teria (Blanco et al, 2011). In addition, groundwater tidally driven into nearshore ecosystems was found to be negatively correlated with seagrass habitat conditions (Houk et al, 2013). Nutrient loads via groundwater discharge may affect the community structure to move towards macroalgal blooms via bottom-up control (Lapointe, 1997) and likely play a role in the displacement of slow-growing benthic flora with fast-growing species observed in Sanya Bay in the last two decades (Titlyanov et al, 2015).…”

Section: Seasonal and Regional Extrapolationsmentioning

confidence: 99%

“…Coral reefs are considered to be one of the most sensitive and stressed ecosystems occupying the coastal zone (Ban et al, 2014). Groundwater input to coral reefs has been shown to be globally important and carry a significant amount of terrestrially derived nutrients to the reef systems (D'Elia et al, 1981;Paytan et al, 2006;Houk et al, 2013). Groundwater discharge is usually enriched in N relative to P with an N : P ratio higher than the Redfield ratio, 16 : 1 (Redfield, 1960), because of more efficient immobilization of P than N in coastal aquifers (Slomp and Van Cappellen, 2004).…”

Section: Introductionmentioning

confidence: 99%

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Wang¹

2017

Preprint

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Watershed discharge patterns, secondary consumer abundances, and seagrass habitat condition in Yap, Micronesia

Cited by 9 publications

References 36 publications

Tidal variability of nutrients in a coastal coral reef system influenced by groundwater

Tidal variability of nutrients in a coastal coral reef system influenced by groundwater

Tidal variability of nutrients in a coastal coral reef system influenced by groundwater

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