Dissolved inorganic nitrogen uptake kinetics and δ15N of Zostera marina L. (eelgrass) in a coastal lagoon with oyster aquaculture and upwelling influence

Sandoval‐Gil, Jose Miguel; Camacho-Ibar, Víctor F.; Ávila-López, María del Carmen; Hernández-López, Julieta; Zertuche-González, José A.; Cabello‐Pasini, Alejandro

doi:10.1016/j.jembe.2015.06.018

Cited by 16 publications

(22 citation statements)

References 83 publications

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“…Hasta la fecha, no se han realizado mediciones directas de ninguno de los 2 procesos en esta laguna costera, pero la composición isotópica de Zostera marina y de Ulva spp. en la laguna también sugiere que la fijación de N 2 es más intensa en los extremos internos del sistema (Sandoval-Gil et al 2015, Carriquiry et al 2016. Por otra parte, en bahía San Quintín, el N nuevo proveniente del océano adyacente disminuye desde la boca hacia el interior de la laguna (Camacho-Ibar et al 2003, Hernández-Ayón et al 2004) y los aportes continentales son considerados nulos (Aguirre-Muñoz et al 2001), por lo que las macrófitas de las zonas más internas probablemente presentan una mayor dependencia al N proveniente de los procesos internos como la amonificación y la fijación.…”

Section: Study Areaunclassified

“…Sediments from the first centimeter were also exposed to light. The same procedure was followed but the incubation was performed under an irradiance of 350 mol photons m -2 s -1 , the maximum irradiance at the site in winter (Sandoval-Gil et al 2015). The incubation was ended by transferring the gas to Vacutainer vials previously purged with argon.…”

Section: Medición De Tasas De Fijación De Nmentioning

confidence: 99%

“…Los viales fueron purgados con argón y, posteriormente, se les inyectaron 10 mL de acetileno para iniciar la incubación, la cual se realizó en oscuridad y a temperatura constante. También se realizaron incubaciones con luz de los sedimentos del primer centímetro, para los cuales se siguió el mismo procedimiento pero la incubación se realizó con una irradiancia de 350 mol fotones m -2 s -1 , correspondiente a la máxima irradiancia del sitio en invierno (Sandoval-Gil et al 2015). La incubación se terminó al transferir el gas a viales Vacutainer previamente purgados con argón.…”

Section: Medición De Tasas De Fijación De Nunclassified

“…To date, no direct measurements of these 2 processes have been made in the lagoon, but the isotopic composition reported for Zostera marina and Ulva spp. also suggests that N 2 fixation is more intense in the innermost parts of the system (Sandoval-Gil et al 2015, Carriquiry et al 2016. As the new N contributed by the adjacent ocean decreases from the mouth to the interior of the lagoon (Camacho-Ibar et al 2003, Hernández-Ayón et al 2004 and the continental inputs are null (Aguirre-Muñoz et al 2001), the macrophytes growing in the innermost areas are likely more dependent on N provided by internal processes such as ammonification and fixation.…”

Section: Introductionmentioning

confidence: 99%

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Benthic nitrogen fixation in Zostera marina meadows in an upwelling-influenced coastal lagoon

et al. 2017

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Dinitrogen (N 2) fixation rates were determined in the phyllosphere and in sediments with and without the presence of eelgrass (Zostera marina) in San Quintín Bay, an upwelling-influenced coastal lagoon in the NE Pacific. Samples were collected during winter 2015 at 4 sites with a gradient of oceanic influence and contrasting impact from oyster aquaculture. N 2 fixation rates were determined with the acetylene reduction assay. Treatments under light and in the dark, and with and without sodium molybdate resulted in similar fixation rates, suggesting that heterotrophic nonsulfate-reducing bacteria made the largest contribution to N 2 fixation, while sulfate-reducing bacteria had low fixation activity at most stations. N 2-fixation rates in sediments ranged from 7 to 12 mol m-2 h-1 and were similar to those in other temperate seagrass-dominated estuaries. Winter conditions were likely responsible for small spatial differences in N 2 fixation rates throughout the lagoon, even between vegetated and unvegetated sites and among depth sections of sediment cores. During winter, Z. marina growth rates and biomass are low, resulting in low and less variable release of labile organic carbon, which acts as substrate for diazotrophs. The lowest N 2 fixation rates were measured at a site where high denitrification rates have been observed, probably reflecting a competition between diazotrophs and denitrifiers. The highest fixation rates were measured at the innermost station where oceanic nitrate is scarce. Epiphytic bacteria contributed 7% of the total N 2 fixation, with rates of <0.5 mol m-2 h-1. N 2 fixation potentially supplied 5-10% of Z. marina N requirements and could supply ~30% of the N loss via denitrification in winter.

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Section: Study Areaunclassified

Section: Medición De Tasas De Fijación De Nmentioning

confidence: 99%

Section: Medición De Tasas De Fijación De Nunclassified

Section: Introductionmentioning

confidence: 99%

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Benthic nitrogen fixation in Zostera marina meadows in an upwelling-influenced coastal lagoon

et al. 2017

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“…The water column is estimated to contribute approximately 50% of nutrients required for seagrass growth and survival (Lee et al, 2007). The relative importance of above and belowground biomass for carbon sequestration and nutrient uptake is highly variable, related to nutrient type, seagrass species, and other environmental factors (La Nafie et al, 2014;Sandoval-Gil et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Elevated Turbidity and the Nutrient Removal Capacity of Seagrass

et al. 2018

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Seagrass meadows provide a range of important ecosystem functions that can be influenced by anthropogenic pressures. Sediment loading from coastal land use mismanagement can elevate turbidity and reduce seabed light levels, thereby impacting seagrass primary productivity and meadow health. Less understood is the impact of elevated turbidity on the nutrient removal capacity of seagrass, which is a key ecosystem function. Here, we use in situ benthic chambers to show that elevated turbidity is associated with lower nutrient (NH 4 + ) removal within intertidal seagrass meadows. Our results suggest that reductions in sediment loading to improve water clarity may increase the nutrient removal capacity of intertidal seagrass meadows influenced by light limitation. When quantifying important ecosystem functions such as nutrient removal by seagrass it is important to consider this context dependency.

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Meadow trophic status regulates the nitrogen filter function of tropical seagrasses in seasonally eutrophic coastal waters

Thomsen

Herbeck

Viana

et al. 2023

Limnology & Oceanography

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The nutrient filter function is an important ecosystem service of seagrass meadows that mitigates the consequences of coastal eutrophication. In northeast Hainan in China, large seagrass areas were lost due to chronic eutrophication induced by untreated pond aquaculture effluents. However, in adjacent areas, seagrasses could survive due to seasonal exposure (i.e., not chronic) to eutrophication only. In a way, the conditions in these areas represent a transitional environment which allows investigating the effect of eutrophication on seagrass performance and their nitrogen uptake capacity. We tested how a 4‐week in situ nutrient enrichment affected inorganic nitrogen uptake rates of a multispecies seagrass meadow in eutrophic and non‐eutrophic seasons, in light and in darkness. All species maintained nitrogen uptake in the dark and preferred ammonium over nitrate. In the eutrophic season, the seagrass leaf biomass and growth were lower resulting in a lower nitrogen filter capacity. Among the species present, Cymodocea rotundata and Cymodocea serrulata covered 48% and 45%, respectively, of their daily nitrogen demand for leaf growth through leaf uptake from the water column, while it was only 30% for Thalassia hemprichii, the last remaining species in meadows degraded by eutrophication, as deduced from previous studies. It indicates that a multispecies seagrass meadow has a higher nitrogen filter capacity than a monospecific T. hemprichii meadow. By reducing seagrass diversity and, hence, the nitrogen filter function, eutrophication triggers a self‐reinforcing process. Once the nitrogen filtering capacity of a seagrass meadow is exhausted, further eutrophication and seagrass loss are expected.

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Dissolved inorganic nitrogen uptake kinetics and δ15N of Zostera marina L. (eelgrass) in a coastal lagoon with oyster aquaculture and upwelling influence

Cited by 16 publications

References 83 publications

Benthic nitrogen fixation in Zostera marina meadows in an upwelling-influenced coastal lagoon

Benthic nitrogen fixation in Zostera marina meadows in an upwelling-influenced coastal lagoon

Elevated Turbidity and the Nutrient Removal Capacity of Seagrass

Meadow trophic status regulates the nitrogen filter function of tropical seagrasses in seasonally eutrophic coastal waters

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