Regulation of annual variation in heterotrophic bacterial production in the Schelde estuary (SW Netherlands)

Goosen, Nico; Rijswijk, Pieter van; Kromkamp, Jacco C.; Peene, J.

doi:10.3354/ame012223

Cited by 52 publications

(43 citation statements)

References 24 publications

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“…They are in the same range observed during the summer monsoon months (June --September) in other areas of open Arabian Sea (Goosen et al 1997, Wiebinga et al 1997. Bacterial production also agreed with ranges reported by Goosen et al (1997) and Wiebinga et al (1997) during southwest monsoon. This clearly suggests that a large area in the Arabian Sea experiences low abundance and production of bacteria during the summer monsoon.…”

Section: Discussionsupporting

confidence: 76%

“…Under the Joint Global Ocean Flux Study (JGOFS) programmes, there have been a number of recent studies on the abundance (and production) of bacteria in the Arabian Sea (Burkill et al 1993;Ducklow 1993;Wiebinga 1994;Ramaiah et al 1996;Goosen et al 1997;Veldhuis et al 1997;Wiebinga et al 1997;Campbell et al 1998). Seasonal variations are clearly seen with higher abundance and production rates during spring and fall inter-monsoons (Ramaiah et al 1996;Campbell et al 1998;Pomroy and Joint 1999).…”

Section: Introductionmentioning

confidence: 99%

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Abundance and relationship of bacteria with transparent exopolymer particles during the 1996 summer monsoon in the Arabian Sea

et al. 2000

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Bacterial abundance and production, numbers, sizes and concentrations of transparent exopolymer particles (TEP) and total organic carbon (TOC) were measured during the 1996 summer monsoon to understand the relationship between TEP, the most labile particulate organic carbon, and bacteria. While high regional variability in the vertical distribution of TOC was discernible, TEP concentrations were high in surface waters at 18--20 N along 64 E with concentrations well over 25 mg alginic acid equivalents l À1 due to upwelling induced productivity. Their concentrations decreased with depth and were lower between 200 and 500 m. Bacterial concentrations were up to 1.99 Â 10 8 l À1 in the surface waters and decreased by an order of magnitude or more at depths below 500 m. A better relationship has been found between bacterial abundance and concentrations of TEP than between bacteria and TOC, indicating that bacterial metabolism is fueled by availability of TEP in the Arabian Sea. Assuming a carbon assimilation of 33%, bacterial carbon demand (BCD) is estimated to be 1.017 to 4.035 g C m À2 d À1 in the surface waters. The observed TEP concentrations appear to be sufficient in meeting the surface and subsurface BCD in the northern Arabian Sea.

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Section: Discussionsupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Abundance and relationship of bacteria with transparent exopolymer particles during the 1996 summer monsoon in the Arabian Sea

et al. 2000

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“…6C,D). Such observations are in resulting in compartmentalization of surface and botagreement with previous studies, such as Lovejoy et al tom waters in relation to ecological parameters such as (1996) and Goosen et al (1997) who demonstrated temtemperature, DO, nutritional contents, and bacterial perature as one of the most influential environmental abundance (Figs. 1 to 4).…”

Section: Discussioncontrasting

confidence: 52%

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

Patel¹,

Fukami²,

Nishijima³

2000

Aquat. Microb. Ecol.

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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.

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“…The lack of interannual and seasonal correspondence between BP and phytoplankton productivity and biomass was not unexpected and has been seen for some other estuarine systems (Findlay et al 1991, Ducklow & Shiah 1993, Staroscik & Smith 2004. Others report a close coupling between BP and phytoplankton parameters (Cole et al 1988, Hoch & Kirchman 1993, Goosen et al 1997, although the number of studies with multiyear coverage is limited.…”

Section: Discussionmentioning

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.

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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.

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Regulation of annual variation in heterotrophic bacterial production in the Schelde estuary (SW Netherlands)

Cited by 52 publications

References 24 publications

Abundance and relationship of bacteria with transparent exopolymer particles during the 1996 summer monsoon in the Arabian Sea

Abundance and relationship of bacteria with transparent exopolymer particles during the 1996 summer monsoon in the Arabian Sea

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

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

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