Network analysis of nitrogen inputs and cycling in the Neuse River estuary, North Carolina, USA

Christian, Robert R.; Thomas, Cassondra R.

doi:10.1007/bf02711992

Cited by 73 publications

(35 citation statements)

References 52 publications

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“…This observation, along with increased N fixation rates, supports the hypothesis that internal N cycling is important during base-flow conditions and that the sediments are a source of N during these periods ( Christian and Thomas 2003;Gardner et al 2006;McCarthy et al 2008). NO { 3 assimilation can be the primary fate of NO { 3 in drought conditions (Hou et al 2012) and a significant fate of NO { 3 during warmer seasons (Christian and Thomas 2003). These internal sources of N allow production to continue during periods without delivery of nutrients or organic matter from the watershed (Fig.…”

Section: Discussionsupporting

confidence: 78%

“…The quantity and timing of flood events are important considerations to understanding how estuaries respond to these events. Nitrogen transformation rates and metabolism metrics are important indicators of freshwater input effects on estuarine ecosystems, including DO impairment of estuaries (Russell et al 2006;Russell and Montagna 2007) or increased N removal from the ecosystem (Christian and Thomas 2003).…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Estuarine ecosystem function response to flood and drought in a shallow, semiarid estuary: Nitrogen cycling and ecosystem metabolism

Bruesewitz¹,

Gardner²,

Mooney³

et al. 2013

Limnology & Oceanography

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We quantified sediment-water interface and water column nitrogen (N) transformation rates seasonally over the course of a year that incorporated a major storm event and a period of prolonged riverine base flow in Copano Bay, Texas, a shallow, productive estuary in the western Gulf of Mexico. We calculated daily rates of gross primary production (GPP), community respiration (CR), and net ecosystem production (NEP) in Copano Bay to examine carbon (C) cycling over the course of the year. These metrics of estuarine ecosystem function indicated that the estuary switched from a net sink for N during floods to a net source of N during droughts while sustaining high rates of primary production throughout the year. The estuary became a net sink for N as a result of increased denitrification rates following a storm event. Both GPP and CR increased immediately following a flood event, and the system was driven to net heterotrophy. Copano Bay became a net source of N during periods of prolonged base flow via increased N fixation rates. Internal N cycling became increasingly important during periods of base flow, including increased rates of dissimilatory nitrate reduction to ammonium. This internal N cycling sustained production during periods of drought, when GPP < CR. Both CR and NEP were linked to nutrient export from the inflowing rivers. N and C cycles were tightly linked but became decoupled briefly as a result of inputs of nutrients and organic matter during the period after a major storm event.

show abstract

Section: Discussionsupporting

confidence: 78%

Section: Discussionmentioning

confidence: 99%

Estuarine ecosystem function response to flood and drought in a shallow, semiarid estuary: Nitrogen cycling and ecosystem metabolism

Bruesewitz¹,

Gardner²,

Mooney³

et al. 2013

Limnology & Oceanography

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show abstract

“…edu/ ulan/ntwk/ netwrk.html. The output from network analysis provides many useful indices and system properties of natural ecosystems, and relevant information on the interpretation of energy and nutrient flows, how these affect the structure of the ecosystem, and how one may wish to direct management or monitoring actions for the conservation or rehabilitation of biodiversity and ecosystem function (Christian & Thomas 2003). Output from network analysis was used to assess changes over time of the Sylt-Rømø Bight and on the trophic dynamics of the ecosystem.…”

Section: Ecological Network Analysismentioning

confidence: 99%

Effect of invasive species on the structure and function of the Sylt-Rømø Bight ecosystem, northern Wadden Sea, over three time periods

Baird¹,

Asmus²,

Asmus³

2012

Mar. Ecol. Prog. Ser.

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, respectively, in 2010. Reasons for the increases in oysters and A. modestus are related to climate change which favored strong recruitment of the invasive species during unseasonably warm summers, and the subsequent decline to weak recruitment of the invasive species and an unseasonably cold 2009/2010 winter. We used ecological network analysis (ENA) to quantify ecosystem structure and function through analyses of energy (or carbon) transfer between living and non-living compartments in each of the 3 network models. Results from ENA show an increase in most of the system attributes, but a decline in number of cycles, the trophic efficiency, the ascendency ratios, and relative redundancy from 1995 to 2007; these are ascribed to the impact of the invasive species on system organization and function. Following the dramatic decline of the invasive species from 2007 to 2010 most of the system attributes decreased. The variance in the biomass and associated flows of other compartments in addition to that of the invasive species has also played a role in the changes in system attributes and function.

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“…This paper extends this work using a companion storage-based methodology, NEA-S, re-notated from its antecedent and originating contributions (Barber, 1978a(Barber, ,b, 1979Matis and Patten, 1981). Time-series data implementing 16 seasonal steady-state network models of nitrogen (N) storage and flow in the Neuse system were constructed for spring 1985 through winter 1989 by Christian and Thomas (2000Thomas ( , 2003. Network topology was constant over time, but the storage and transfer quantities changed.…”

mentioning

confidence: 99%

Indirect effects and distributed control in ecosystems

Whipple

Patten

Borrett

2014

Ecological Modelling

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Network analysis of nitrogen inputs and cycling in the Neuse River estuary, North Carolina, USA

Cited by 73 publications

References 52 publications

Estuarine ecosystem function response to flood and drought in a shallow, semiarid estuary: Nitrogen cycling and ecosystem metabolism

Estuarine ecosystem function response to flood and drought in a shallow, semiarid estuary: Nitrogen cycling and ecosystem metabolism

Effect of invasive species on the structure and function of the Sylt-Rømø Bight ecosystem, northern Wadden Sea, over three time periods

Indirect effects and distributed control in ecosystems

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