The Influence of Storm Events on Metabolism and Water Quality of Riverine and Estuarine Segments of the James, Mattaponi, and Pamunkey Rivers

Bukaveckas, Paul A.; Tassone, Spencer J.; Lee, W.; Franklin, Rima B.

doi:10.1007/s12237-020-00819-9

Cited by 15 publications

(13 citation statements)

References 43 publications

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“…Bi-directional flows in tidal freshwaters create more favorable water residence time conditions (relative to non-tidal rivers) that allow for the development of phytoplankton communities and the potential for greater biological influence on C forms and retention. Our prior work in the James Estuary has documented higher rates of ecosystem metabolism in the tidal freshwater segment relative to adjacent riverine and lower estuarine segments (Tassone and Bukaveckas 2019;Bukaveckas et al 2020). The occurrence of a chlorophyll-a and productivity maxima in the tidal fresh zone was attributed to longer water residence time and proximal nutrient inputs from riverine and local point sources (Bukaveckas et al 2011;Qin and Shen 2017).…”

Section: Introductionmentioning

confidence: 91%

“…This is the third in a series of papers that rely in part on comparisons among these estuaries to draw inferences about processes occurring at the riverestuarine transition. Previous papers focused on the influence of storm events on river and estuarine metabolism and water quality (Bukaveckas et al 2020), and on factors regulating water clarity and primary production (Henderson & Bukaveckas 2021). The proximity of the estuaries facilitated frequent sampling (1-2 week intervals) that is needed to characterize C fluxes.…”

Section: Studymentioning

confidence: 99%

“…and respiration, we used our previously published estimates of GPP and ER for the James and Pamunkey (Bukaveckas et al 2020). Rates of metabolism were derived from continuous (15 min) monitoring of dissolved oxygen at stations located within our study segments of the James and Pamunkey (Figure 1).…”

Section: Estuarine Metabolism To Assess the Role Of Internal C Transformations Via Photosynthesismentioning

confidence: 99%

“…2.6 Sampling and Analysis. Methods were described previously (Bukaveckas et al 2011;Bukaveckas et al 2020;Henderson and Bukaveckas 2021) and are summarized here. Data were collected from 4 stations in the James tidal fresh segment, 3 stations in each of the Pamunkey and Mattaponi study reaches, and one tributary stream (Kimages Creek) located at the VCU Rice Center (Figure 1; Table 1).…”

Section: Estuarine Metabolism To Assess the Role Of Internal C Transformations Via Photosynthesismentioning

confidence: 99%

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Carbon dynamics at the river-estuarine transition: a comparison among tributaries of Chesapeake Bay

Bukaveckas

2021

Preprint

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Abstract. Sources and transformation of C were quantified using mass balance and ecosystem metabolism data for the upper segments of the James, Pamunkey and Mattaponi Estuaries. The goal was to assess the role of external (river inputs & tidal exchange) vs. internal (metabolism) drivers in influencing the forms and fluxes of C. C forms and their response to river discharge differed among the estuaries based on their physiographic setting. The James, which receives the bulk of inputs from upland areas (Piedmont and Mountain), exhibited a higher ratio of inorganic to organic C, and larger inputs of POC. The Pamunkey and Mattaponi receive a greater proportion of inputs from lowland (Coastal Plain) areas, which were characterized by low DIC and POC, and elevated DOC. We anticipated that transport processes would dominate during colder months when discharge is elevated and metabolism is low, and that biological processes would predominate in summer, leading to attenuation of C through-puts via de-gassing of CO2. Contrary to expectations, highest retention of OC occurred during periods of high through-put, as elevated discharge resulted in greater loading and retention of POC. In summer, internal cycling of C via production and respiration was large in comparison to external forcing despite the large riverine influence in these upper estuarine segments. The estuaries were found to be net heterotrophic based on retention of OC, export of DIC, low GPP relative to ER, and a net flux of CO2 to the atmosphere. In the James, greater contributions from phytoplankton production resulted in a closer balance between GPP and ER, with autochthonous production exceeding allochthonous inputs. Combining the mass balance and metabolism data with bioenergetics provided a basis for estimating the proportion of C inputs utilized by the dominant metazoan. The findings suggest that invasive catfish utilize 15 % of total OM inputs and up to 40 % of allochthonous inputs to the James.

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Section: Introductionmentioning

confidence: 91%

Section: Studymentioning

confidence: 99%

Section: Estuarine Metabolism To Assess the Role Of Internal C Transformations Via Photosynthesismentioning

confidence: 99%

Section: Estuarine Metabolism To Assess the Role Of Internal C Transformations Via Photosynthesismentioning

confidence: 99%

See 2 more Smart Citations

Carbon dynamics at the river-estuarine transition: a comparison among tributaries of Chesapeake Bay

Bukaveckas

2021

Preprint

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“…Higher chlorophyll-a values in the James indicate greater phytoplankton contributions to GPP, which brings the tidal fresh segment more closely in balance with respect to production and respiration. The Pamunkey and Mattaponi have low chlorophyll-a by comparison (Bukaveckas et al 2020) but extensive lateral floodplains and emergent marshes (Hupp et al 2009;Noe and Hupp 2009;Lake et al 2013). Decomposition of terrestrial organic matter during floodplain inundation may account for the high CO2 concentrations and air-water fluxes during high discharge conditions.…”

Section: Metabolism and Carbonmentioning

confidence: 99%

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Bukaveckas

2021

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Size fractionated biogeochemical constituents across adjacent coastal systems informs approaches for integrating small catchment studies into regional models

Khoo

Sipler

Faulkner

et al. 2023

Limnology & Oceanography

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Observed and predicted hydrological changes in C‐rich boreal ecosystems have the ability to change the transport trajectory of biogeochemical constituents from the land to ecologically, economically, and culturally important coastal systems. Yet, most of our current understanding of biogeochemical fluxes and cycling across salinity gradients stem from observations of large and urbanized riverine systems, which overlooks the numerically abundant smaller systems. In this study, we conducted a baseline assessment of the biogeochemical constituents across salinity gradients among two adjacent small systems in the boreal zone. Dissolved iron (DFe) and its ratio with dissolved organic carbon (DFe : DOC) were the most sensitive indicators for small catchment heterogeneity. These parameters were the best indicators of change among coastal systems across regional and seasonal scales. Our results also confirm consistencies in common optical measures (SUVA254 and S[275–295/350–400]) and DOC to nitrogen ratios that may adequately provide representation of biogeochemical composition on a regional scale. Simultaneous variation in biogeochemical parameters across particulate and dissolved pools during the summer‐to‐fall transition period indicate this as an important timeframe for targeted investigation of the linkages between biogeochemical parameters and coastal ecosystem functioning. By providing some key spatial and temporal constraints on biogeochemical fluxes among boreal river‐estuaries, our findings indicate that DFe and DFe : DOC ratios should be used to design research aimed at capturing regional and coastal ecosystem scale biogeochemical fluxes to inform Earth System Models.

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The Influence of Storm Events on Metabolism and Water Quality of Riverine and Estuarine Segments of the James, Mattaponi, and Pamunkey Rivers

Cited by 15 publications

References 43 publications

Carbon dynamics at the river-estuarine transition: a comparison among tributaries of Chesapeake Bay

Carbon dynamics at the river-estuarine transition: a comparison among tributaries of Chesapeake Bay

Reply on RC1

Size fractionated biogeochemical constituents across adjacent coastal systems informs approaches for integrating small catchment studies into regional models

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