Isotopic Evidence that Nitrogen Enrichment Intensifies Nitrogen Losses to the Atmosphere from Subtropical Mangroves

Reis, Carla Roberta Gonçalves; Reed, Sasha C.; Oliveira, Rafael S.; Nardoto, Gabriela Bielefeld

doi:10.1007/s10021-018-0327-0

Cited by 15 publications

(8 citation statements)

References 74 publications

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“…The natural abundance of 15 N in ambient sediments reflects a longterm isotopic fractionation with a preferential consumption of lighter 14 N and residual of 15 N during denitrification, anammox, and/or volatilization (Robinson 2001;Reis et al 2019). For experimental sites with the same N source, sites with higher denitrification rates usually had higher δ 15 N Air values in total N content as more 14 N was released from sediments back to atmosphere through denitrification (Bryantmason et al 2013;Reis et al 2019). As such, our result of δ 15 N Air values increasing from the lower-OM sediment to higher-OM sediment sites in the ambient sediment samples demonstrates that the area with higher OM sediment concentrations had greater N loss to the atmosphere, which supports the finding that higher OM sediment facilitates denitrification in coastal deltaic floodplains (Li et al 2020;Li and Twilley, 2021).…”

Section: Discussionmentioning

confidence: 99%

Heterotrophic nitrogen fixation in response to nitrate loading and sediment organic matter in an emerging coastal deltaic floodplain within the Mississippi River Delta plain

Twilley

Hou

2021

Limnology & Oceanography

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Increasing nitrate (NO 3 − ) loading in rivers due to agricultural fertilization alters benthic nitrogen (N) cycling and shifts coastal wetlands from being a net source to net sink of reactive N. Heterotrophic N 2 fixation that converts N 2 to reactive N is often assumed negligible in eutrophic ecosystems and excluded in coastal N budget evaluations. We investigated N 2 fixation and denitrification in response to increasing NO 3 − loading (0, 10, and 100 μM) and sediment organic matter (OM sediment ) concentrations in the emerging Wax Lake Delta. Continuous flow-through incubations with 30 N 2 addition was applied to measure N 2 fixation. The variation of N 2 fixation rates from 0 to 437 μmol N m −2 h −1 among different NO 3 − and OM sediment concentrations were comparable to the estimated denitrification rates of 141-377 μmol N m −2 h −1 . Increasing overlying NO 3 − concentrations reduced N 2 fixation rates and facilitated denitrification rates at each OM sediment concentration. However, 100 μM of overlying NO 3 − did not thoroughly inhibit N 2 fixation rates in sites with intermediate and higher

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Section: Discussionmentioning

confidence: 99%

Heterotrophic nitrogen fixation in response to nitrate loading and sediment organic matter in an emerging coastal deltaic floodplain within the Mississippi River Delta plain

Twilley

Hou

2021

Limnology & Oceanography

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“…Accordingly, we have also found that aquatic macrophytes exhibit higher foliar δ 15 N than mangroves at the +++NM plots (Reis et al, unpublished data). Moreover, the lower NO 3 − -N concentrations in mangrove sediment at the +++NM plots compared to the others likely re ected a higher absorption of N by the species of aquatic macrophytes, along with higher N losses to the atmosphere via denitri cation as a consequence of excess inorganic N inputs and intensi ed N cycling (Reis et al 2017b(Reis et al , 2019. The differences in foliar N and C:N ratios between native and non-native species can also modify the quality of the organic matter in the sediment, which could also potentially affect N and C pools and cycling in the system (Liao et al 2008;Lu et al 2014;Lee et al 2017).…”

Section: Discussionmentioning

confidence: 99%

“…The study sites differ mainly in two aspects: (i) levels of anthropogenic N inputs (Reis et al 2019) and (ii) presence of aquatic macrophytes. We selected two conserved mangrove areas under high marine in uence, free of aquatic macrophytes and with no in uence of anthropogenic N inputs.…”

Section: Study Areamentioning

confidence: 99%

“…The other two sites included mangrove areas colonized by aquatic macrophytes and subjected to high N inputs (+++NM) (Reis et al 2019) (Table 1).…”

Section: Study Areamentioning

confidence: 99%

“…Environmental factors that make an ecological system more susceptible to the colonization of non-native species are widely discussed, though there is a consensus that disturbance plays a key role in this process ( Reis et al 2019). These disturbances change environmental conditions and, as a consequence, may facilitate the colonization of non-native species into mangroves (Lugo 1998;Dahdouh-Guebas et al 2005;Biswas et al 2018).…”

Section: Introductionmentioning

confidence: 99%

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Interactive Effects of Abiotic and Biotic Factors Drive Aquatic Plant Colonization in Subtropical Mangroves

Sampaio

Reis

Lignon

et al. 2021

Preprint

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The colonization and spread of non-native species are recognized as a critical driver of environmental change in mangrove ecosystems. However, environmental factors that favor non-native plant colonization in mangroves are still poorly understood. To contribute to filling this gap, we investigated the effect of selected abiotic factors associated controlling aquatic macrophytes colonization in mangroves in Southeastern Brazil. Furthermore, we also assessed foliar attributes of native and non-native species to evaluate whether biotic attributes favored the colonization. We selected 18 plots in mangrove forests under different levels of anthropogenic N inputs, both colonized and non-colonized by aquatic macrophytes in the Estuarine-Lagoon Complex of Cananeia-Iguape, southeastern Brazil. We measured interstitial salinity, sediment nitrate and ammonium concentrations, and sediment physicochemical properties. We also measured foliar nitrogen (N) concentrations, foliar C:N, and foliar δ13C of both native and non-native species. We found that interstitial salinity at 10 cm depth followed by nitrate concentrations in sediment were the main factors associated with the occurrence of aquatic macrophytes in the studied mangrove areas. Moreover, non-native species had about 2-fold higher foliar N concentrations as well as about a 1.5-fold lower C:N ratios compared to native species. Low salinity and increased N availability in sediment allowed for the success of aquatic macrophytes into mangrove forests, also resulting in high amount of dead mangrove trunks (up 53% of basal area).

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Environmental and Biotic Factors Driving Distributional Patterns in Mangrove and Salt Marsh Ecosystems

Charlier-Sarubo

Cunha-Lignon

Soriano-Sierra

2023

Brazilian Mangroves and Salt Marshes

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Isotopic Evidence that Nitrogen Enrichment Intensifies Nitrogen Losses to the Atmosphere from Subtropical Mangroves

Cited by 15 publications

References 74 publications

Heterotrophic nitrogen fixation in response to nitrate loading and sediment organic matter in an emerging coastal deltaic floodplain within the Mississippi River Delta plain

Heterotrophic nitrogen fixation in response to nitrate loading and sediment organic matter in an emerging coastal deltaic floodplain within the Mississippi River Delta plain

Interactive Effects of Abiotic and Biotic Factors Drive Aquatic Plant Colonization in Subtropical Mangroves

Environmental and Biotic Factors Driving Distributional Patterns in Mangrove and Salt Marsh Ecosystems

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