Planktonic bacteria in estuaries and coastal waters of northern Massachusetts: spatial and temporal distribution

Wright, Richard; Coffin, RB

doi:10.3354/meps011205

Cited by 83 publications

(56 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The conservative bacterial distribution relaBacterial abundances along the Hudson River estuary varied from 5 to 16 X 10' cells 1-' (Table 3). This range was consistent with the low end of ranges reported in other U.S. east coast estuaries, such as the Rhode River estuary (3.0 X 108 cells 1-l; Rublee et al 1984), the Delaware River estuary (6.5 to 10 X 108 cells I-'; Coffin & Sharp 1987, Hoch & Kirchman 1993) and in Massachusetts, USA, salt marsh estuaries (7 X 10' cells 1-l; Wright & Coffin 1983). The average cell density in the Hudson River estuary (8.6 X 108 cells 1-l) was also consistent with minimum cell counts (10 X 10' cells I-'; Findlay et al 1991b) measured in the tidal freshwater Hudson River in early spring.…”

Section: Resultssupporting

confidence: 74%

Bacterioplankton dynamics and organic carbon partitioning in the lower Hudson River estuary

Sañudo‐Wilhelmy¹,

Taylor²

1999

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

ABSTRACT. Surface water samples collected at 10 stations in April 1996 along the entire salinity grad e n t of the Hudson River estuary were fractionated into particulate (POC), dissolved (DOC; <0.45 pm), high molecular weight (HM\VOC; 10 kDa-0.45pm), and low molecular weight (LMWOC; c10 kDa) organic carbon. Bacterial concentrations, production and specific growth rates were also determined at each location. While HMWOC (6 to 26 p M ) exhibited nonconservative removal relative to ideal dilution of river and seawater along the estuary. DOC (176 to 324 PM) showed a nonconservative excess along this salinity gradient. These contrasting distributions suggest that the majority of DOC was exported to the ocean and consisted of low lability material, while a reactive fraction of HMWOC was removed during estuarine mixing. Bacterial abundances (5 to 16 X 10' cells I-'), production (3.4 to 28.7 pg C 1-' d-l), and specific growth rates (0.09 to 0.66 d-l) varied significantly along the salinity gradient. These variables were positively correlated with algal standing stocks (chlorophyll a) and even more coherent with HMWOC distributions. In contrast, bacterial metabolism varied independently of POC. DOC, and LMWOC concentrations Therefore, while HMWOC accounted for <10% of the DOC, this pool appeared to be very dynamic, possibly due to bacterial degradation. However, mass balance estimates indicate that bacterial uptake could remove at most 30% of the HMWOC. suggesting that abiotic processes such as flocculation are probably the major removal mechanism of HMW organic matter within the estuary. Lastly, contrary to previous results from the tidal freshwater section of the Hudson, strong coherence between primary and secondary production and the nonconservative excesses of DOC found in the lower estuary suggest that carbon and bacterial dynamics can vary qualitatively along different reaches of this river.

show abstract

Section: Resultssupporting

confidence: 74%

Bacterioplankton dynamics and organic carbon partitioning in the lower Hudson River estuary

Sañudo‐Wilhelmy¹,

Taylor²

1999

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

show abstract

“…The ecological or apparent (Hoch & Kirchman 1993) Q 10 determined for BP in the NRPS (2.35, 3 to 34°C) was in the middle of that range and temperature explained about half of the variation in BP rates based on the semi-log regression analysis. This was similar to the relationships found in Narragansett Bay (Staroscik & Smith 2004), Chesapeake Bay (Shiah & Ducklow 1994a), Massachusetts salt marsh estuaries (Wright & Coffin 1983) and enrichment mesocosms (Hobbie & Cole 1984). Using the alternate Arrhenius formulation, the calculated activation energy of 0.63 eV for BP was remarkably similar to the predicted 0.62 eV from Gillooly et al (2001) and the average of 0.63 eV reported by Brown et al (2004), lending more support to the MTE predictions.…”

Section: Discussionsupporting

confidence: 71%

“…Individual estuaries are unique systems based on their geomorphic, hydrologic, climatic, and watershed characteristics, and it remains a challenge to make generalizations about the patterns and controls of estuarine BP (Wright & Coffin 1983, McManus et al 2004). The Neuse River and Pamlico Sound (NRPS) estuarine system (North Carolina, USA) has witnessed several decades of basic and applied research aimed at combating water quality problems associated with excessive anthropogenic nutrient overenrichment (Paerl et al 2006a,b), but little is known about BP dynamics.…”

Section: Introductionmentioning

confidence: 99%

Temperature, organic matter, and the control of bacterioplankton in the Neuse River and Pamlico Sound estuarine system

Peierls¹,

Paerl²

2010

Aquat. Microb. Ecol.

View full text Add to dashboard Cite

A 4 yr, spatially extensive study of the Neuse River and Pamlico Sound estuarine system, North Carolina, was used to evaluate the temporal patterns and bottom-up controls of the resident bacterioplankton community. This meso-to eutrophic estuarine system had high concentrations of dissolved and particulate organic matter and supported an active and abundant phytoplankton community. Temporal analysis of bacterioplankton productivity (BP) revealed a strong seasonal pattern, similar to water temperature. Comparisons of BP and several environmental variables grouped by season and year showed little correspondence between the bacteria and either river discharge or organic matter at either scale. Temperature explained about half of the variation in BP data, but without any obvious threshold in the semi-log temperature-productivity relationship, implying the absence of a shift to substrate limitation at higher temperatures. The temperature effect varied in space and was lower at the freshwater station, suggesting differential substrate availability or the presence of a different resident microbial community. Proxies for bacterial substrates, including dissolved organic carbon, particulate organic nitrogen, and chlorophyll a, improved the predictive power in multiple regression models, but at least one-third of the variation in BP remained unexplained. The regression models differed by station group, further highlighting the possible difference in biota and/or resources between the freshwater and brackish sites.

show abstract

“…Similarly, APA did not show any correlation (p > 0.05) with nutritional parameters including TDN, DIN, DON and DIP contents of either of the waters, indicating that the activity is not nutrient limited. It may be of relevance to point out that while some studies have reported organic matter input being a n important controlling factor of heterotrophic activity (Hollibaugh & Azam 1983, Wright & Coffin 1983, it is also agreed that in coastal and estuarine areas, factors other than substrate supply may regulate the activity (Shiah & Ducklow 1994). The latter was found to be the case at the present study site.…”

Section: Discussionsupporting

confidence: 65%

Regulation of seasonal variability of aminopeptidase activities in surface and bottom waters of Uranouchi Inlet, Japan

Patel¹,

Fukami²,

Nishijima³

2000

Aquat. Microb. Ecol.

View full text Add to dashboard Cite

The potential aminopeptidase activity (APA) vis-a-vis important ecological parameters of surface and bottom waters of Uranouchi Inlet (Japan), a semi-enclosed eutrophic coastal ecosystem, were studied on a weekly to biweekly basis from mid-August 1996 to early November 1997. The aim of this study was to investigate the main factors regulating the annual and seasonal dynamics of APA in the inlet. APA was estimated in short-term incubations as the V, , of the rate of enzymatic hydrolysis of a fluorophore 7-L-leucyl-4-methyl couomarinylarnide under conditions close to those of in situ. The water column structure at the study site changed considerably during the study period as the ecological parameters such as temperature, dissolved oxygen (DO), nutrient contents, and bacterial abundance exhibited pronounced seasonal stratification (May to September). When the water column was mixed (October to March), surface and bottom waters possessed similar APA . But when the water column became stratified, pronounced differences became apparent, with surface water showing considerably higher APA. On extreme days, surface water possessed as much as -20 times higher APA than that of bottom water. Thus, APA of surface water demonstrated strong seasonality and varied by almost 40-fold compared to that of bottom water, which varied only about 12-fold during the study period. Notably, bacterial abundances of both waters showed limited seasonality and varied only -3-fold during the same period. These results imply that changes in APA are not merely a function of bacterial abundance but rather more of per-cell activity. On an annual basis, APA in both waters were positively correlated (p < 0.001) with temperature and bacterial abundance, and negatively correlated with s M i t y (p c 0.001 for surface and p < 0.01 for bottom water) but were not correlated (p > 0.05) with DO, chlorophyll a (p < 0.05; only for surface water), inorganic or organic forms of nitrogen (DIN, DON) or inorganic phosphorous (DIP) contents. Furthermore, when the water column was mixed, APA correlated strongly with temperature (p < 0.001; r = 0.87), and marginally (p < 0.05) with DIN (r = 0.43) and DIP (r = 0.40) content but not with DO (p > 0.05) content. In contrast, when the water column became stratified, APA correlated only marginally with temperature (0.01 c p < 0.05; r = 0.33) but strongly with DO (p c 0.001; r = 0.73), and negatively (p c 0.001) with DIN (r = -0.61) and DIP (r = -0.70) content. DON content did not show any correlation (p > 0.05) with APA regardless of whether the water column was mixed or stratified. These correlations suggest that temperature played a critical role in regulating the APA when the water column was mixed (October to March), and DO or inorganic nutrient contents (May to September) when the water colun~n was stratified.

show abstract

Planktonic bacteria in estuaries and coastal waters of northern Massachusetts: spatial and temporal distribution

Cited by 83 publications

References 23 publications

Bacterioplankton dynamics and organic carbon partitioning in the lower Hudson River estuary

Bacterioplankton dynamics and organic carbon partitioning in the lower Hudson River estuary

Temperature, organic matter, and the control of bacterioplankton in the Neuse River and Pamlico Sound estuarine system

Regulation of seasonal variability of aminopeptidase activities in surface and bottom waters of Uranouchi Inlet, Japan

Contact Info

Product

Resources

About