Chesapeake Bay nutrient and plankton dynamics. 1. Bacterial biomass and production during spring tidal destratification in the York River, Virginia, estuary1,2

Ducklow, Hugh W.

doi:10.4319/lo.1982.27.4.0651

Cited by 70 publications

(41 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Previous work has focused primarily on the mouth of the estuary, concentrating on the effects of stratification-destratification caused by spring-neap cycles (Haas et al 1981;Ducklow 1982). More recently, bacterial dynamics (Koepfler 1989;Schultz 1999) and phytoplankton and nutrient dynamics (Sin et al 1999) have been studied in the main part of the York River estuary.…”

Section: Methodsmentioning

confidence: 99%

Atmospheric CO₂ evasion, dissolved inorganic carbon production, and net heterotrophy in the York River estuary

Raymond

Bauer

Cole

2000

Limnology & Oceanography

266

182

View full text Add to dashboard Cite

Direct measurements of the partial pressure of CO 2 (pCO 2 ) and dissolved inorganic carbon (DIC) were made over a 2-yr period in surface waters of the York River estuary in Virginia. The pCO 2 in surface waters exceeded that in the overlying atmosphere, indicating that the estuary was a net source of CO 2 to the atmosphere at most times and locations. Salinity-based DIC mixing curves indicate there was also an internal source of both DIC and alkalinity, implying net alkalinity generation within the estuary. The DIC and alkalinity source displayed seasonal patterns similar to that of pCO 2 and were reproducible over a 2-yr study period.We propose that the source of inorganic carbon necessary for both the sustained CO 2 evasion to the atmosphere and the advective export of DIC is respiration in excess of primary production (e.g., net heterotrophy). The rates of CO 2 evasion and DIC export were estimated to provide an annual rate of net heterotrophy of ϳ100 g C m Ϫ2 yrϪ1 . Approximately 40% of this excess inorganic carbon production was exported as DIC to the coastal ocean, whereas 60% was lost as CO 2 evasion to the atmosphere. The alkalinity generation needed to sustain the export of inorganic carbon, as HCO 3 Ϫ , is most likely provided by net sulfate reduction in sediments. Accumulation of sulfide in the sediments of a representative site directly adjacent to the York River estuary is sufficient to account for the net export of alkalinity. The seasonality of net heterotrophy causes large variations in annual CO 2 and DIC concentrations, and it stresses the need for comprehensive temporal data sets when reporting annual rates of CO 2 evasion, DIC advection, and net heterotrophy.

show abstract

Section: Methodsmentioning

confidence: 99%

Atmospheric CO₂ evasion, dissolved inorganic carbon production, and net heterotrophy in the York River estuary

Raymond

Bauer

Cole

2000

Limnology & Oceanography

266

182

View full text Add to dashboard Cite

show abstract

“…Previous work on phytoplankton and bacteria populations (Ducklow 1982;Koepfler 1989;Schultz 1999;Sin et al 1999;Raymond and Bauer 2000) and carbon cycling (Neubauer et al 2000;Raymond et al 2000) in the York River Estuary was invaluable for the work presented here. Based on these earlier studies, we hypothesized that the DOC and DIC isotopic distributions would be influenced by tidal marshes in the upper York and by phytoplankton in the middle and lower York.…”

mentioning

confidence: 98%

DOC cycling in a temperate estuary: A mass balance approach using natural ¹⁴C and ¹³C isotopes

Raymond

Bauer

2001

Limnology & Oceanography

179

View full text Add to dashboard Cite

We measured dissolved organic carbon (DOC), dissolved inorganic carbon (DIC), and their corresponding ⌬ 14 C and ␦ 13C values in order to study the sources and fates of DOC in the York River Estuary (Virginia, U.S.A.). The ⌬ 14 C and ␦ 13C values of DOC and DIC at the freshwater end-member indicate that during periods of moderate to high flow, riverine DOC entering the York was composed of decadal-aged terrestrially organic matter. In nearly all cases, DOC concentrations exceeded conservative mixing lines and were therefore indicative of a net DOC input flux from within the estuary that averaged 1.. The nonconservative behavior of DOC in the York River Estuary was also apparent in carbon isotopic mixing curves and the application of an isotopic mixing model. The model predicted that 20-38% of the DOC at the mouth of the estuary was of riverine (terrestrial ϩ freshwater) origin, while 38-56% was added internally, depending on the isotopic values assigned to the internally added DOC. Measurements of ⌬ 14 C and ␦ 13 C of DOC and DIC and marsh organic matter suggest that the internal sources originated from estuarine phytoplankton and marshes. The isotopic mixing model also indicates a significant concomitant loss (27-45%) of riverine DOC within the estuary.Changes in DOC concentration, ⌬ 14 C-DOC, and ␦ 13 C-DOC were also measured during incubation experiments designed to quantify the amounts, sources, and ages of DOC supporting the carbon demands of estuarine bacteria. Results of these experiments were consistent with an estuarine source of phytoplankton and marsh DOC and the preferential utilization of young ( 14 C-enriched) DOC in the low-salinity reaches of the York. However, the average removal of riverine DOC by bacteria accounts for only ϳ4-19% of the riverine pool; therefore, other significant sinks for DOC exist within the estuary.

show abstract

“…Although few measurements are available, bacterial production and growth seem significant in estuaries (e.g. Ducklow 1982, Albright 1983b, Christian et al 1984, and suggest that bacteria are not simply passive drifters. Predation has also been observed on estuarine bacteria (Haas & Webb 1979, Davis & Sieburth 1984, Wright & Coffin 1984.…”

Section: Introductionmentioning

confidence: 99%

Box model analysis of bacterial fluxes in the St. Lawrence Estuary

Painchaud¹,

Lefaivre²,

Therriault³

1987

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

To interpret the distribution of bacteria in the St. Lawrence Estuary, Canada, and in an attempt to identify the processes controlling it, bacterial abundance, heterotrophic activity, chlorophyll a, temperature and salinity data were examined. Bacterial data in particular were analyzed using a 2-dimensional box model. Horizontal and vertical bacterial fluxes were calculated for each box and net rates, indicative of production and loss of bacteria, were estimated. The model was characterized by large negative fluxes downstream of the salinity intrusion which, in combination with experimental and microscopical evidence, suggests that freshwater bacteria entrained in brackish waters died massively. Calculations and field measurements showed that the growth of bacteria entrained upstream in the deep layer of the estuary could be sufficient to make up for the loss of the freshwater bacteria and maintain the observed distribution. The results suggest that the limit of salinity ~ntrusion is a sharp ecological barrier between 2 distinct bacterial communities: the freshwater commun~ty on one side and the estuarine community on the other side. Loss terms observed further downstream were possibly due to intense grazing by flagellates, themselves preyed upon by the large copepod populations existing in the same area. The hypotheses generated by the field data and the flux calculations are summarized in a conceptual model.

show abstract

Chesapeake Bay nutrient and plankton dynamics. 1. Bacterial biomass and production during spring tidal destratification in the York River, Virginia, estuary1,2

Abstract: Bacterial abundance, biomass, and

Cited by 70 publications

References 11 publications

Atmospheric CO₂ evasion, dissolved inorganic carbon production, and net heterotrophy in the York River estuary

Atmospheric CO₂ evasion, dissolved inorganic carbon production, and net heterotrophy in the York River estuary

DOC cycling in a temperate estuary: A mass balance approach using natural ¹⁴C and ¹³C isotopes

Box model analysis of bacterial fluxes in the St. Lawrence Estuary

Contact Info

Product

Resources

About

Chesapeake Bay nutrient and plankton dynamics. 1. Bacterial biomass and production during spring tidal destratification in the York River, Virginia, estuary1,2

Abstract: Bacterial abundance, biomass, and

Cited by 70 publications

References 11 publications

Atmospheric CO2 evasion, dissolved inorganic carbon production, and net heterotrophy in the York River estuary

Atmospheric CO2 evasion, dissolved inorganic carbon production, and net heterotrophy in the York River estuary

DOC cycling in a temperate estuary: A mass balance approach using natural 14C and 13C isotopes

Box model analysis of bacterial fluxes in the St. Lawrence Estuary

Contact Info

Product

Resources

About

Atmospheric CO₂ evasion, dissolved inorganic carbon production, and net heterotrophy in the York River estuary

Atmospheric CO₂ evasion, dissolved inorganic carbon production, and net heterotrophy in the York River estuary

DOC cycling in a temperate estuary: A mass balance approach using natural ¹⁴C and ¹³C isotopes