Nitrogen Loading to Great South Bay: Land Use, Sources, Retention, and Transport from Land to Bay

Kinney, Erin L.; Valiela, Iván

doi:10.2112/jcoastres-d-09-00098.1

Cited by 45 publications

(34 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The δ 15 N signatures of particulate organic matter have been used to trace N sources with low values (< 3‰) being linked to N from fertilizer or atmospheric deposition and heavier values (> 3‰) being associated with N from wastewater (Lapointe et al ; Kendall and McDonnell ). In this study, the δ 15 N values of A. anophagefferens and PC cyanobacteria were always > 5‰ except for 15 June 2015 and averaged ∼ 10‰ suggesting that the growth of A. anophagefferens and PC cyanobacteria during these blooms might be derived from wastewater (Bianchi ; Kendall and McDonnell ), a finding consistent with prior conclusions that wastewater is the primary source of N to Long Island's south shore bays (Kinney and Valiela ; Stinnette ). For parts of this study (fall 2014, spring 2015), the 15 N values of other picoeukaryotes and heterotrophic bacteria were also isotopically heavy and consistent with a wastewater source of N. On average, other picoeukaryotes (1.7 ± 9.6‰) were lighter in δ 15 N than A. anophagefferens (10.3 ± 3.7‰), PC cyanobacteria (9.0 ± 4.2‰), and heterotrophic bacteria (5.2 ± 6.8‰) throughout the study, suggesting they utilized a different, lighter N sources.…”

Section: Discussionsupporting

confidence: 90%

Quantifying nitrogen assimilation rates of individual phytoplankton species and plankton groups during harmful algal blooms via sorting flow cytometry

Kang

Kudela

Gobler

2017

Limnology & Ocean Methods

View full text Add to dashboard Cite

While 15N‐labeled nitrogen (N) compounds have been used to quantify N uptake rates by plankton communities for decades, accurately ascribing those rates to individual populations or species has been a challenge. Here, we apply sorting flow cytometry combined with species‐specific immuno‐detection of a harmful alga, Aureococcus anophagefferens, to contrast the nutritional ecology of this alga with co‐occurring picoplankton (picoeukaryotes, cyanobacteria, heterotrophic bacteria) during brown tides. The method was iteratively refined to yield close agreement (85–101%) between plankton community 15N uptake quantified via traditional filtration and this novel sorting method. Sorting of plankton revealed that the δ15N values of A. anophagefferens and phycocyanin‐containing cyanobacteria were more enriched (∼ 10‰) than the values of other picoeukaryotes and heterotrophic bacteria that decreased to < 0‰ after A. anophagefferens abundance declined, suggesting that these plankton utilized isotopically lighter nitrogen sources (e.g., recycled nutrients or fertilizer). A. anophagefferens utilized multiple forms of nitrogen (e.g., nitrate, ammonium, urea) during blooms and their uptake rates of ammonium and urea were highest during blooms. However, A. anophagefferens urea uptake rates on a per cell basis were fivefold faster than all other groups, affirming the nutritionally strategic uptake of urea to fuel brown tides. This study presents a novel approach to successfully sort a single algal species from a plankton community for the purpose of assessing nitrogen uptake and highlights a promising and powerful approach for investigating and contrasting the nutritional ecology of bloom‐causing species and co‐occurring plankton populations during harmful algal blooms.

show abstract

Section: Discussionsupporting

confidence: 90%

Quantifying nitrogen assimilation rates of individual phytoplankton species and plankton groups during harmful algal blooms via sorting flow cytometry

Kang

Kudela

Gobler

2017

Limnology & Ocean Methods

View full text Add to dashboard Cite

show abstract

“…Conversion of native vegetation to farmland and intensification of catchment land use threaten the ecosystem health of rivers and estuaries worldwide (Niyogi and others 2007;Flynn and others 2009;Young and Collier 2009;Kinney and Valiela 2011). Land-use intensification can cause increased nutrient and fine sediment inputs to rivers (Quinn and Stroud 2002;Schindler 2006) and estuaries (Dauer and others 2000;Bricker and others 2008).…”

Section: Introductionmentioning

confidence: 99%

“…To the best of our knowledge, our study is the first to use an integrative approach to assess impacts of land use on ecosystem functioning along this gradient. Previous research has focused on single aquatic ecosystems, either freshwaters (Niyogi and others 2007;Flynn and others 2009;Young and Collier 2009), estuaries (Meeuwig 1999) or ocean and coastal ecosystems (Kinney and Valiela 2011).…”

Section: Introductionmentioning

confidence: 99%

Intensity of Land Use in the Catchment Influences Ecosystem Functioning Along a Freshwater-Marine Continuum

et al. 2012

View full text Add to dashboard Cite

Intensification of catchment land use often adversely affects ecosystem health in rivers and estuaries via changes to physicochemistry and ecosystem functioning, but whether such land-use effects differ along a freshwater-marine continuum has not been studied. We investigated relationships between intensity of land use and two measures of ecosystem function in freshwater, estuarine and near-marine habitats. Standardized bioassays to determine cellulose breakdown (cotton and canvas strips) and algal accrual rates (ceramic tiles) were deployed in 10 river-to-marine continua whose catchment areas ranged from 2.6 to 99.6% developed. Using general linear models and an information-theoretic approach to select the best predictive models for our response variables, we found that higher dissolved phosphorus concentrations, linked with highly developed catchments, were associated with greater rates of cellulose decomposition (both tensile strength loss and mass loss). Furthermore, after controlling for the contribution of phosphorus or salinity, decomposition rates in freshwater and near-marine habitats generally responded curvilinearly to catchment development, indicating the involvement of additional unmeasured, land-userelated physicochemical or biological variables. The strength and shape of relationships between percentage developed land area and algal biomass accrual rates also contrasted among freshwater (strongest, curvilinear), mid-estuary (intermediate, positive), and near-marine sites (weakest, no obvious shape). Because land-use intensity can influence ecosystem functioning along the entire continuum from streams and rivers to estuaries and coasts, resource managers should adopt an integrated approach to decisions affecting catchment land use.

show abstract

“…Each of the components required to estimate the nitrogen loading in the NLM are subject to uncertainty, and Collins et al (2000) calculated a 13% uncertainty in the loading estimates of the NLM using a bootstrap resampling method. The NLM has more recently been used to successfully estimate nitrogen loading to 74 subwatersheds in southern New England (Latimer and Charpentier 2010) and 33 subwatersheds of the Great South Bay, NY (Kinney and Valiela 2011). The NLM estimates nitrogen loads from fertilizer application, human wastewater, and atmospheric deposition to 4 land-use types (i.e., natural vegetation, turf, agricultural land, and impervious surface).…”

Section: Introductionmentioning

confidence: 99%

Relationships of Modeled Nitrogen Loads with Marsh Fish in the Narragansett Bay Estuary, Rhode Island

McKinney

Chintala

Raposa

et al. 2015

Northeastern Naturalist

View full text Add to dashboard Cite

The human population and associated watershed development has risen steadily since the 1850s in Rhode Island. With these increases, human-derived wastewater has also risen dramatically, resulting in increasing nitrogen loads to estuarine systems. In this study, we examined relationships of modeled watershed nitrogen loads of 6 coastal subwatersheds 15 r = +0.97, P < 0.05) between the 15 N in Fundulus heteroclitus L. (Common P 15 -veloped mainland marsh sites compared to less-developed island marsh sites. Our results derived from watershed wastewater sources. Furthermore, there was an inverse relationship (P = 0.05) between the modeled percentage of human wastewater and mummichog size. The increasing loads of watershed nitrogen entering into coastal salt marshes are a concern because it is unclear how well salt marsh ecosystems can continue to assimilate high nitrogen inputs especially when also subjected to a warming climate.

show abstract

Nitrogen Loading to Great South Bay: Land Use, Sources, Retention, and Transport from Land to Bay

Cited by 45 publications

References 36 publications

Quantifying nitrogen assimilation rates of individual phytoplankton species and plankton groups during harmful algal blooms via sorting flow cytometry

Quantifying nitrogen assimilation rates of individual phytoplankton species and plankton groups during harmful algal blooms via sorting flow cytometry

Intensity of Land Use in the Catchment Influences Ecosystem Functioning Along a Freshwater-Marine Continuum

Relationships of Modeled Nitrogen Loads with Marsh Fish in the Narragansett Bay Estuary, Rhode Island

Contact Info

Product

Resources

About