Size fractionated metabolism of coastal microbial plankton

Hopkinson, CS; Sherr, BF; Wiebe, W. J.

doi:10.3354/meps051155

Cited by 94 publications

(93 citation statements)

References 30 publications

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“…Both theoretical and experimental studies have demonstrated higher individual respiration rates and lower gross growth efficiencies in marine bacteria when substrate C:N ratios increase (Harder and Dijkhuizen 1983;Billen 1984;Lancelot and Billen 1985;Goldman et al 1987;Hopkinson et al 1989). Similar trends were more recently observed for freshwater bacteria with increasing substrate C:P and C:N ratios (Cimbleris and Kalff 1998;Biddanda et al 2001).…”

Section: Respirationsupporting

confidence: 60%

How Daphnia copes with excess carbon in its food

2003

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Animals that maintain near homeostatic elemental ratios may get rid of excess ingested elements from their food in different ways. C regulation was studied in juveniles of Daphnia magna feeding on two Selenastrum capricornutum cultures contrasting in P content (400 and 80 C:P atomic ratios). Both cultures were labelled with 14 C in order to measure Daphnia ingestion and assimilation rates. No significant difference in ingestion rates was observed between P-low and P-rich food, whereas the net assimilation of 14 C was higher in the treatment with P-rich algae. Some Daphnia were also homogeneously labelled over 5 days on radioactive algae to estimate respiration rates and excretion rates of dissolved organic C (DOC). The respiration rate for Daphnia fed with high C:P algae (38.7% of body C day -1 ) was significantly higher than for those feeding on low C:P algae (25.3% of body C day -1 ). The DOC excretion rate was also higher when animals were fed on P-low algae (13.4% of body C day -1 ) than on P-rich algae (5.7% of body C day -1 ) . When corrected for respiratory losses, total assimilation of C did not differ significantly between treatments (around 60% of body C day -1 ). Judging from these experiments, D. magna can maintain its stoichiometric balance when feeding on unbalanced diets (high C:P) primarily by disposing of excess dietary C via respiration and excretion of DOC.

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Section: Respirationsupporting

confidence: 60%

How Daphnia copes with excess carbon in its food

2003

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“…Griffith et al (1990) found that the contribution of free-living bacteria to plankton community respiration varied from 42 to 81 % in coastal waters off the Georgia coast. Although bacteria generally account for most of the respiration in coastal waters (Williams 1984. Hopkinson et al 1989, Griffith et al 1990), the correlation between plankton community respiration and bacterial production was poor in the present study.…”

Section: Metabolism Of Tdr By Bacteriacontrasting

confidence: 46%

“…The poor correlation between bacterial production and plankton community respiration suggests that other organisms may also be important consumers of oxygen in the Mississippi River plume. Spatial variations in bactenal growth efficiencies could also contribute to the poor correlation between bacterial production and community respiration (Hopkinson et al 1989, Griffith et al 1990). …”

Section: Metabolism Of Tdr By Bacteriamentioning

confidence: 99%

Enhanced bacterioplankton production and respiration at intermediate salinities in the Mississippi River plume

Chin-Leo¹,

Benner²

1992

Mar. Ecol. Prog. Ser.

148

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Bacterial abundance and production (thymidine and leucine incorporation) were measured along a salinity gradient from the Mississippi Rlver (0 %o) to the open waters of the Gulf of Mexico (36 %a) during July-August 1990 and February 1991. Bactenal production in surface waters was maximal at intermediate salinities (15 to 30 %o). Nutrlent enrichment experiments suggested that bacterial growth near the outflow of the river was C limited whereas bacteria in plume waters of intermediate salinities were P and N limited. Rates of plankton community oxygen demand measured during winter were also maximal at intermediate salinities indicating an area of increased heterotrophic activity. The oxygen demand associated with heterotrophic bacterioplankton activity during summer was an important factor leading to hypoxic conditions in bottom waters of the Louisiana continental shelf. In summer, bacterial abundance and production ranged from 0.25 to 3.34 X log cells 1.' and from 4 to 90 pg C 1-' d-l, respectively. In winter, the corresponding ranges were 0.36 to 1.09 X log cells I-' and 3 to 20 pg C 1-' d-' Depth-integrated bacterial production on the Louisiana shelf decreased from 443 k 144 mg C m-2 d-' in summer to 226 f 124 mg C m-2 d-' in winter. Using empirically-derived bacterial growth efficiency values of 19 and 29 %, we estimated that bacterial production in summer could be supported by 10 to 58 % of phytoplankton production. In winter, the amount of carbon needed to support bacterial production exceeded phytoplankton production suggesting that bacterial growth during this season was heavily dependent on riverine sources of organic matter.

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“…Zooplankton, especially microzooplankton, are amongst the most important contributors to plankton CR (Calbet and Landry, 2004;Hernández-León and Ikeda, 2005;Hopkinson et al, 1989). Unfortunately, microzooplankton were not measured in this study.…”

Section: Plankton Activity Associated With the Changjiang River Floodmentioning

confidence: 87%

“…Plankton CR is typically defined as the integrated rate of organic carbon consumption by plankton communities (e.g., Hopkinson et al, 1989;Rowe et al, 1986). In summer, the mean CR rate in the surface waters of the ECS ranges from 52.2 to 128.4 mg C m −3 d −1 (Chen et al, 2006, and it is significantly correlated with fluvial discharge from the Changjiang River .…”

Section: Effects Of Changjiang River Flooding On Plankton Community Rmentioning

confidence: 99%

The influence of episodic flooding on a pelagic ecosystem in the East China Sea

et al. 2017

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Abstract. This study was designed to determine the effects of flooding on a pelagic ecosystem in the East China Sea (ECS) with a focus on plankton activity and plankton community respiration (CR). In July 2010, a flood occurred in the Changjiang River. As a comparison, a variety of abiotic and biotic parameters were monitored during this flooding event and during a non-flooding period (July 2009). During the flood, the Changjiang diluted water (CDW) zone covered almost two-thirds of the ECS, which was approximately 6 times the area covered during the non-flooding period. The mean nitrate concentration was 3-fold higher during the 2010 flood (6.2 vs. 2.0 µM in 2009). CR was also higher in the 2010 flood: 105.6 mg C m −3 d −1 vs. only 73.2 mg C m −3 d −1 in 2009. The higher CR in 2010 could be attributed to phytoplankton respiration, especially at stations in the CDW zone that were not previously characterized by low sea surface salinity in 2009. In addition, zooplankton (> 330 µm) were another important component contributing to the high CR rate observed during the 2010 flood; this was a period also associated with a significant degree of f CO 2 drawdown. These results collectively suggest that the 2010 flood had a significant effect on the carbon balance in the ECS. This effect might become more pronounced in the future, as extreme rainfall and flooding events are predicted to increase in both frequency and magnitude due to climate change.

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Size fractionated metabolism of coastal microbial plankton

Cited by 94 publications

References 30 publications

How Daphnia copes with excess carbon in its food

How Daphnia copes with excess carbon in its food

Enhanced bacterioplankton production and respiration at intermediate salinities in the Mississippi River plume

The influence of episodic flooding on a pelagic ecosystem in the East China Sea

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