Stable isotope compositions of aquatic flora as indicators of wetland eutrophication

Wang, Jianzhu; Gu, Baojing; Ewe, Sharon M. L.; Wang, Yan; Li, Yuncong

doi:10.1016/j.ecoleng.2015.06.007

Cited by 19 publications

(12 citation statements)

References 44 publications

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“…inorganic N, water) indicators (Cole et al, 2004;Karube et al, 2010;Kaushal et al, 2011;Vander Zanden et al, 2005). Aquatic plants are attractive indicators for tracing N inputs as they assimilate and/or fix N from the surrounding environment, integrating isotopic variability both spatially and temporally and thus reducing noise (Bannon and Roman, 2008;Cole et al, 2004;Kohzu et al, 2008;McIver et al, 2015;Wang et al, 2015). This may be particularly useful in Mediterranean wetlands, which are subject to high temporal variability in flooding patterns (Green et al, 2017), and subsequently in the sources and concentrations of N at a given moment of time.…”

Section: Introductionmentioning

confidence: 99%

Stable isotopes in helophytes reflect anthropogenic nitrogen pollution in entry streams at the Doñana World Heritage Site

Paredes

Ramírez

Forero

et al. 2019

Ecological Indicators

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A B S T R A C T Nitrogen (N) loading from anthropogenic activities is contributing to the eutrophication and degradation of wetlands worldwide. Doñana (southwestern Spain), includes a dynamic marshland protected as a UNESCO World Heritage Site, which has a catchment area exposed to increasing N inputs from intensive agriculture and poorly treated urban wastewaters. Identifying the sources of N entering this iconic wetland complex is vital for its conservation. To this end, we combined multiyear (2014-2016), spatially-explicit data on N concentration in water samples with measurements on the relative abundance of N stable isotopes (δ 15 N) in Bolboschoenus maritimus and Typha domingensis, two dominant helophytes (i.e. emergent macrophytes) in the Doñana marsh and entry streams. Overall, plant tissues from entry streams showed higher δ 15 N values than those from the marsh, particularly in those streams most affected by urban wastewaters. Isotopic values did not differ between plant species. Water samples affected by isotopically-enriched urban wastewaters and other diffuse organic N inputs (e.g. livestock farming) had relatively high Dissolved Inorganic Nitrogen (DIN) concentrations. In contrast, in streams mainly affected by diffuse N pollution from greenhouse crops, high DIN values were related to isotopically-depleted N sources (e.g., inorganic fertilizers). Thus, helophytes, in combination with other parameters such as N concentration in water or land cover, can be valuable indicators of anthropogenic pressures in Mediterranean wetlands. Helophytes have widespread distributions, and can be readily sampled even when water is no longer present. However, identification of specific N sources through helophyte δ 15 N values is limited when key potential N sources are isotopically undistinguishable (e.g. fertilizers vs. atmospheric sources). cyanobacterial blooms, hypoxia, expansion of floating plants and, ultimately

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Section: Introductionmentioning

confidence: 99%

Stable isotopes in helophytes reflect anthropogenic nitrogen pollution in entry streams at the Doñana World Heritage Site

Paredes

Ramírez

Forero

et al. 2019

Ecological Indicators

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“…There are several sources of data used in this study. Stable isotope data on cattail were downloaded from the US Geological Survey South Florida Information Access (https:// sofia.usgs.gov/metadata/sflwww/ever_isotope_data.html) and Wang et al (2015). Typically, duplicate to triplicate samples were collected from each site for stable isotope determination.…”

Section: Sources Of Datamentioning

confidence: 99%

“…Typically, duplicate to triplicate samples were collected from each site for stable isotope determination. Select environmental data (Table 4 in Appendix) from the same time period (1995 to 2009) of the stable isotope data collection were downloaded from DBHYDRO, a hydrometeorologic, water quality, and hydrogeologic data retrieval system managed by the South Florida Water Management District (West Palm Beach Florida, USA), and Wang et al (2015). When environmental data were not available from the same site of cattail collection, data from closely located sites were used.…”

Section: Sources Of Datamentioning

confidence: 99%

“…Table 2 presented several biological and nutrient variables along the nutrient gradient from inflow to interior marsh in WCA-2A (the F transect, Fig. 1) obtained from the literature Wang et al 2015). Data were grouped into reference, transition, and impacted sites as described above.…”

Section: Environmental Characteristics Along Nutrient Gradientmentioning

confidence: 99%

“…Carbon and nitrogen stable isotope compositions (δ 13 C and δ 15 N) of biota may be an alternative means to detect early environmental changes in aquatic ecosystems (Oczkowski et al 2014;Wang et al 2015;Gooddy et al 2016;Nigro et al 2017) and can provide insight into the sources, sinks, and cycling of carbon and nitrogen in biota that interact with their physical and chemical environments. Several studies have indicated that δ 13 C and δ 15 N values can be used as early indicators for environmental changes (McKee et al 2002;Wang et al 2015;Zhang et al 2016;Nigro et al 2017). The 13 C depletion in the mangrove trees has been attributed to reduced stomatal conductance under environmental stressors such as nutrients and salinity (Lin and Sternberg 1992;McKee et al 2002).…”

Section: Introductionmentioning

confidence: 99%

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Environmental stress and eutrophication in freshwater wetlands: evidence from carbon and nitrogen stable isotopes in cattail (Typha domingensis Pers.)

Zheng

Wang

et al. 2019

Ecol Process

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Background: Florida's Everglades is a vast freshwater peatland that has been impacted by the alterations of hydrological pattern and water quality which led to changes in plant species composition and biodiversity. In this study, carbon and nitrogen stable isotopes (δ 13 C and δ 15 N) in cattail (Typha domingensis) are evaluated as indicators of environmental changes in the Everglades wetlands along nutrient and hydrological gradients represented by reference sites with total phosphorus (TP) < 10 μg L −1 , transition sites with TP ≥ 10 μg L −1 < 20 μg L −1 and impacted sites with TP ≥ 20 μg L −1 which differed in hydrology or habitats (marsh and canal). Results: Cattail δ 13 C values decreased significantly from reference (-24.1‰), transition (-26.8‰) to the impacted sites (-28.2‰). In contrast, δ 15 N values increased significantly from reference (-5.2‰), transition (2.4‰) to the impacted site (5.9‰). In response to a poor hydrological condition, cattail in marsh area displayed 13 C enrichment (-26.0‰) and 15 N depletion (0.2‰). By contrast, cattail grown in the canal sites with favorable hydropattern displayed 13 C depletion (-27.6‰) and 15 N enrichment (5.9‰) from the canal sites with more favorable hydrological condition. Conclusions: The different patterns for the changes in δ 13 C and δ 15 N in cattail suggested that increased nutrients led to increased stomatal conductance and 13 C fractionation during carbon uptake and decreased 15 N fractionation with increasing nitrogen demand while poor hydrological condition coupled with low nutrients led to reduced plant growth indicated by higher δ 13 C and lower δ 15 N values. Findings from this study suggested that δ 13 C in emerged macrophytes such as cattail can be used as an indicator for environmental stress while δ 15 N is a robust indicator for wetland eutrophication.

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Interannual changes in δ15N baseline in a lake–swamp–river food web: effects of summer precipitation in West Siberian forest steppe

et al. 2020

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Stable isotope compositions of aquatic flora as indicators of wetland eutrophication

Cited by 19 publications

References 44 publications

Stable isotopes in helophytes reflect anthropogenic nitrogen pollution in entry streams at the Doñana World Heritage Site

Stable isotopes in helophytes reflect anthropogenic nitrogen pollution in entry streams at the Doñana World Heritage Site

Environmental stress and eutrophication in freshwater wetlands: evidence from carbon and nitrogen stable isotopes in cattail (Typha domingensis Pers.)

Interannual changes in δ15N baseline in a lake–swamp–river food web: effects of summer precipitation in West Siberian forest steppe

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