Jane Tucker

Marine Biological Laboratory, FMH, Massachusetts, United States

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Publications (11)

  • Source
    Jane Tucker · Anne E. Giblin · Charles S. Hopkinson · [...] · Brian L. Howes
    [Show abstract] [Hide abstract] ABSTRACT: Figure optionsDownload full-size imageDownload high-quality image (204 K)Download as PowerPoint slide
    Full-text available · Article · Dec 2014 · Estuarine Coastal and Shelf Science
  • Emily S. Davenport · Jane Tucker · Hap Garritt · [...] · Charles Hopkinson
    Conference Paper · May 2014
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    [Show abstract] [Hide abstract] ABSTRACT: Primary production was measured from 1992–2010 in Massachusetts Bay and just outside Boston Harbor for the Massachusetts Water Resources Authority's outfall monitoring program. In 2003, annual primary production decreased by 221–278 g C m−2 year−1, with decreased rates continuing through 2010. Based on a conceptual model, oceanographic and meteorological variables were analysed with production rates to determine if concurrent environmental changes were responsible for the reduced primary production in Massachusetts Bay. Results indicated that a stronger influx of low salinity water from the Western Maine Coastal Current (WMCC) in recent years might be responsible for the decreases. The WMCC appeared to have become fresher due to increased river discharge in the western Gulf of Maine. Northeasterly winds in recent years promoted the WMCC intrusion into Massachusetts Bay. Correlation between primary production and surface salinities suggested an impact of the WMCC on production rates. We hypothesized that increased stratification resulted in reduced vertical mixing and reduced nutrient concentrations in surface waters for phytoplankton growth. However, no significant correlations were observed between the annual primary production and nutrient concentrations in Massachusetts Bay. Reduced production rates in Massachusetts Bay have, however, been associated with reduced zooplankton abundances, benthic ammonium fluxes and sediment oxygen demand in summer months.
    Full-text available · Article · Jan 2014 · ICES Journal of Marine Science
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    [Show abstract] [Hide abstract] ABSTRACT: Increased intensity of rainfall events during late 2010 led to a remarkable freshening of estuarine, near-and off-shore waters in coastal Pacific Panama. The increased rain intensity during the wet season of 2010 lowered salinity of estuarine and coastal waters to levels unprecedented in previous years. Fresher conditions were most marked within estuaries, but even at 6 km from shore, salinities were 8–13‰ lower during the 2010 wet season, compared to a lowering of up to 2‰ during previous wet seasons. Freshwater added to sur-face waters by rain had major biological, hydrodynamic, and biogeochemical consequences, increasing stream erosion, uprooting stream-edge terrestrial and mangrove trees, increasing mortality of benthic fauna, damping upwelling of denser, nutrient-rich water that was expected given the contemporaneous most intense La Niña in decades, as well as by enriching surface seawater by direct deposition and by hori-zontal advection of nutrients from land. It appears that wet season rainfall is slowly increasing in the region, and if the level of rainfall reported here is a harbinger of future climate change effects on land–sea couplings in tropical coastal ecosystems, the resulting freshening could significantly shift biogeochemistry and coastal food webs in the region and elsewhere. © 2012 Published by Elsevier B.V.
    Full-text available · Article · Apr 2012 · Global and Planetary Change
  • [Show abstract] [Hide abstract] ABSTRACT: Benthic respiration, sediment–water nutrient fluxes, denitrification and dissimilatory nitrate reduction to ammonium (DNRA) were measured in the upper section of the Parker River Estuary from 1993 to 2006. This site experiences large changes in salinity over both short and long time scales. Sediment respiration ranged from 6 to 52mmol m−2 day−1 and was largely controlled by temperature. Nutrient fluxes were dominated by ammonium fluxes, which ranged from a small uptake of −0.3 to an efflux of over 8.2mmol N m−2 day−1. Ammonium fluxes were most highly correlated with salinity and laboratory experiments demonstrated that ammonium fluxes increased when salinity increased. The seasonal pattern of DNRA closely followed salinity. DNRA rates were extremely low in March, less than 0.1mmol m−2 day−1, but increased to 2.0mmol m−2 day−1 in August. In contrast, denitrification rates were inversely related to salinity, ranging from 1mmol m−2 day−1 during the spring and fall to less than 0.2mmol m−2 day−1 in late summer. Salinity appears to exert a major control on the nitrogen cycle at this site, and partially decouples sediment ammonium fluxes from organic matter decomposition. KeywordsBenthic respiration-Benthic fluxes-Salinity-Ammonium-Denitrification-Dissimilatory nitrate reduction to ammonium (DNRA)-Estuary-Sediments
    Article · Sep 2010 · Estuaries and Coasts
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    Nathaniel B. Weston · Anne E. Giblin · Gary T. Banta · [...] · Jane Tucker
    [Show abstract] [Hide abstract] ABSTRACT: We examined the effects of seasonal salinity changes on sediment ammonium (NH4 +) adsorption and exchange across the sediment–water interface in the Parker River Estuary, by means of seasonal field sampling, laboratory adsorption experiments, and modeling. The fraction of dissolved NH4 + relative to adsorbed NH4 + in oligohaline sediments rose significantly with increased pore water salinity over the season. Laboratory experiments demonstrated that small (∼3) increases in salinity from freshwater conditions had the greatest effect on NH4 + adsorption by reducing the exchangeable pool from 69% to 14% of the total NH4 + in the upper estuary sediments that experience large (0–20) seasonal salinity shifts. NH4 + dynamics did not appear to be significantly affected by salinity in sediments of the lower estuary where salinities under 10 were not measured. We further assessed the importance of salinity-mediated desorption by constructing a simple mechanistic numerical model for pore water chloride and NH4 + diffusion for sediments of the upper estuary. The model predicted pore water salinity and NH4 + profiles that fit measured profiles very well and described a seasonal pattern of NH4 + flux from the sediment that was significantly affected by salinity. The model demonstrated that changes in salinity on several timescales (tidally, seasonally, and annually) can significantly alter the magnitude and timing of NH4 + release from the sediments. Salinity-mediated desorption and fluxes of NH4 + from sediments in the upper estuary can be of similar magnitude to rates of organic nitrogen mineralization and may therefore be important in supporting estuarine productivity when watershed inputs of N are low. KeywordsSediments-Ammonium-Adsorption-Parker River estuary-Salinity-Estuary
    Full-text available · Article · Jul 2010 · Estuaries and Coasts
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    [Show abstract] [Hide abstract] ABSTRACT: The relationship between ammonia-oxidizing bacteria (AOB) and potential nitrification rates was examined along a salinity gradient in a New England estuary in spring and late summer over 3 years. Ammonia-oxidizing bacteria abundance was estimated by measuring gene copies of the ammonia monooxygenase catalytic subunit (amoA) using real-time polymerase chain reaction. Ammonia-oxidizing bacteria abundance ranged from below detection to 6.0 x 10(7)amoA copies (gdw sediment)(-1). Mean potential nitrification rates ranged from 0.5 to 186.5 nmol N (gdw sediment)(-1) day(-1). Both AOB abundance and potential rates were significantly higher in spring than late summer. Correlations between rates and abundance varied significantly among sites, but showed site-specific ammonia oxidation kinetics related to AOB community structure. The effect of salinity on potential nitrification rates was evaluated by incubating sediment from each site under four salinity conditions (0, 5, 10 and 30 psu). At all sites, rates were generally highest in the intermediate salinity treatments, but rates at the upstream site were inhibited at high salinity, while rates at the two downstream sites were inhibited at the lowest salinity. Although salinity appears to be an important factor in determining AOB distribution, it may not be the primary factor as AOB exhibited a broad range of salinity tolerance in our experiments. Our results indicate that there are significant differences in abundance and community composition of AOB along the salinity gradient, and the differences are reflected in community function.
    Full-text available · Article · Jul 2007 · Environmental Microbiology
  • Charles S. Hopkinson · Anne E. Giblin · Jane Tucker · Robert H. Garritt
    [Show abstract] [Hide abstract] ABSTRACT: Benthic metabolism and nutrient exchange across the sediment-water interface were examined over an annual cycle at four sites along a freshwater to marine transect in the Parker River-Plum Island Sound estuary in northeastern Massachusetts, U.S. Sediment organic carbon content was highest at the freshwater site (10.3%) and decreased along the salinity gradient to 0.2% in the sandy sediments at the marine end of the estuary. C:N ratios were highest in the mid estuary (23:1) and lowest near the sea (11:1). Chlorophyll a in the surface sediments was high along the entire length of the estuary (39–57 mg chlorophyll a m−2) but especially so in the sandy marine sediments (172 mg chlorophyll a m−2). Chlorophyll a to phaeophytin ratios suggested most chlorophyll is detrital, except at the sandy marine site. Porewater sulfide values varied seasonally and between sites, reflecting both changes in sulfate availability as overlying water salinity changed and sediment metabolism. Patterns of sediment redox potential followed those of sulfide. Porewater profiles of inorganic N and P reflected strong seasonal patterns in remineralization, accumulation, and release. Highest porewater NH4 + values were found in upper and mid estuarine sediments, occasionally exceeding 1 mM N. Porewater nitrate was frequently absent, except in the sandy marine sediments where concentrations of 8 μM were often observed. Annual average respiration was lowest at the marine site (13 mmol O2 m−2 d−1 and 21 mmol TCO2 m−2 d−1) and highest in the mid estuary (130 mmol O2 m−2 d−1 and 170 mmol TCO2 m−2 d−1) where clam densities were also high. N2O and CH4 fluxes were low at all stations throughout the year: Over the course, of a year, sediments varied from being sources to sinks of dissolved organic C and N, with the overall spatial pattern related closely to sediment organic content. There was little correlation between PO4 3− flux and metabolism, which we attribute to geochemical processes. At the two sites having the lowest salinities, PO4 3− flux was directed into the sediments. On average, between 22% and 32% of total system metabolism was attributable to the benthos. The mid estuary site was an exception, as benthic metabolism accounted for 95% of the total, which is attributable to high densities of filter-feeding clams. Benthic remineralization supplied from less than 1% to over 190% of the N requirements and 0% to 21% of the P requirements of primary producers in this system. Estimates of denitrification calculated from stoichiometry of C and N fluxes ranged from 0% for the upper and mid estuary site to 35% for the freshwater site to 100% of sediment organic N remineralization at the marine site. We hypothesize that low values in the upper and mid estuary are attributable to enhanced NH4 + fluxes during summer due to desorption of exchangeable ammonium from rising porewater salinity. NH4 + desorption during summer may be a mechanism that maintains high rates of pelagic primary production at a time of low inorganic N inputs from the watershed.
    Article · Dec 1999 · Estuaries and Coasts
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    David L. Taylor · Summer Morlock · Anne Giblin · [...] · Jane Tucker
    Full-text available · Article · Oct 1997 · Biological Bulletin
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    [Show abstract] [Hide abstract] ABSTRACT: To gain insight into the importance of the benthos in carbon and nutrient budgets of Boston Harbor and surrounding bays, we measured sediment-water exchanges of oxygen, total carbon dioxide (DIC), nitrogen (ammonium, nitrate+nitrite, urea, N2O), silicate, and phosphorus at several stations in different sedimentary environments just prior to and subsequent to cessation of sewage sludge disposal in the harbor. The ratio of the average annual DIC release to O2 uptake at three primary stations ranged from 0.84 to 1.99. Annual average DIC:DIN flux ratios were consistently greater than predicted from the Redfield ratio, suggesting substantial losses of mineralized N. The pattern was less clear for P: some stations showed evidence that the sediments were a sink for P while others appeared to be a net source to the water column over the study period. In general, temporal and spatial patterns of respiration, nutrient fluxes, and flux ratios were not consistently related to measures of sediment oxidation-reduction status such as Eh or dissolved sulfide. Sediments from Boston Harbor metabolize a relatively high percentage (46%) of the organic matter inputs from phytoplankton production and allochthonous inputs when compared to most estuarine systems. Nutrient regeneration from the benthos is equivalent to 40% of the N, 29% of the P, and more than 60% of the Si demand of the phytoplankton. However, the role of the benthos in supporting primary production at the present time may be minor as nutrient inputs from sewage and other sources exceed benthic fluxes of N and P by 10-fold and Si by 4-fold. Our estimates of denitrification from DIC:DIN fluxes suggests that about 45% of the N mineralized in the sediments is denitrified, which accounts for about 17% of the N inputs from land.
    Full-text available · Article · Jun 1997 · Estuaries and Coasts
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    [Show abstract] [Hide abstract] ABSTRACT: Benthic flux rates measured at 12 sites in Buzzards Bay during August 1989 varied by less than a factor of two for benthic respiration and less than a factor of three for DIN release. The only environmental factor that emerged from path analysis as related (negatively) to the spatial pattern of benthic flux rates in August was water depth. The combination of seasonal and spatial observations indicate that the processes oxidizing organic matter in Buzzards Bay sediments are controlled by temperature and the delivery of labile organic matter to the sediment surface. Benthic flux rates in Buzzards Bay were generally low, but N recycling efficiency was high, relative to similar coastal environments. -from Authors
    Full-text available · Article · Jan 1995 · Journal of Marine Research

Publication Stats

427 Citations


  • 2014
    • Marine Biological Laboratory
      • Ecosystems Center
      FMH, Massachusetts, United States
  • 1995
    • Odense University Hospital
      Odense, South Denmark, Denmark