Fluctuations in the Organic Carbon to Chlorophyll a Ratios for Estuarine Benthic Diatom Populations

Jonge, VN de

doi:10.3354/meps002345

Cited by 198 publications

(68 citation statements)

References 22 publications

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“…Detritus and empty frustules were abundant in the sample. However, we found a low phaeopigment content as compared to Chl a, and the C : Chl a ratio (52) is in the range of ratios reported for microphytobenthos (de Jonge 1980). Together, this information indicates that a great proportion of the material was alive.…”

Section: Resultssupporting

confidence: 60%

No limit? The multiphasic uptake of silicic acid by benthic diatoms

Leynaert

Longphuirt

Claquin

et al. 2009

Limnology & Oceanography

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Silicic-acid uptake kinetics for a field population of benthic diatoms were examined using a radioisotope tracer over a concentration range of 0-300 mmol L 21 . The microphytobenthos half saturation constant (54 mmol L 21 ) and specific uptake rates (0.096 h 21 ) for silicic acid were well above those usually found in the pelagic environment. Silicic-acid kinetics were hyperbolic only at low concentrations (,60 mmol L 21 ). At higher concentrations, a second mechanism that did not suggest saturation was activated. Many benthic diatoms are motile and migrate vertically in the upper few centimeters of sediment where there are strong gradients of nutrient concentrations. The multiphasic uptake may allow them to take maximum advantage of the high silicic-acid concentrations found at depth.

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Section: Resultssupporting

confidence: 60%

No limit? The multiphasic uptake of silicic acid by benthic diatoms

Leynaert

Longphuirt

Claquin

et al. 2009

Limnology & Oceanography

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“…de Jonge (1980) suggested that when high C : Chl ratios are observed in benthic microalgal populations, it may reflect decreased diffusion of nutrients and increased excretion of mucilaginous products within the mat as a function of density. As diatom biomass increases, diffusion limitation within the mat intensifies and growth rate declines.…”

Section: Discussionmentioning

confidence: 99%

“…de Jonge (1980) concluded that the use of yearly C : Chl averages to estimate biomass could lead to errors of 34-50%.…”

mentioning

confidence: 99%

Field measurement of specific growth rate, biomass, and primary production of benthic diatoms of Savin Hill Cove, Boston

Gould

Gallagher

1990

Limnology & Oceanography

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“…The annual range of microalgal biomass in the upper 0.5 cm of the sediment, estimated from an organic carbon:chlorophyll a ratio of 40 (de Jonge, 1980), varies from 227-305 mmol C m -2 in winter to 264-583 mmol C m -2 in summer. Thus, the standing crop only accounts for 10-20 % of the total organic carbon in the upper 0.5 cm at the coarse sand site (S), about 18 % at the fine sand site (A) and 7-14 % at the m u d d y sand site (M).…”

Section: Microbenthic Primary Production and Respirationmentioning

confidence: 99%

Temporal variations in microbenthic metabolism and inorganic nitrogen fluxes in sandy and muddy sediments of a tidally dominated bay in the northern Wadden Sea

Kristensen¹,

Jensen²,

Jensen³

1997

Helgoländer Meeresunters.

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Factors controlling seasonal variations in benthic metabolism (O,, flux) and dissolved inorganic nitrogen (DIN) fluxes were examined during a 12-14 month period at three intertidal Wadden Sea stations. Since the flux measurements were made as small-scale laboratory core incubations, the results are primarily related to the microbenthic community (microalgae, bacteria, micro-, meio-and small macrofauna) and cannot be considered representative of the total benthic community in the Wadden Sea. Furthermore, it has to be emphasized that light intensity during daytime simulations were constant and saturating at all times. Benthic primary production and oxygen uptake appeared to be temperature dependent with a 'seasonal Q10' of 1.7-1.8 and 2.7-4.3, respectively. Inundation had no effect on oxygen fluxes as evidenced by similar sediment respiration with and without water cover. A stronger temperature dependence of primary production in muddy than in sandy sediment indicated that the overall control in the latter may be complex due to factors like macrofaunal grazing and nutrient availability. Benthic respiration may not be controlled by temperature alone, as sedimentary organic matter content correlated significantly with both temperature and benthic respiration. Annual gross primary production in high intertidal sandy sediment was 10 and 50 % higher than in low intertidal sandy and muddy sediments, respectively. Since annual benthic community respiration was 2 times higher in muddy than sandy sediments, the annual net primary production was about 0 in the former and 17-19 mol C m -2 yr -1 in the latter. However, heterotrophic contribution by larger faunal components as well as removal of organic carbon by waves and tidal currents, which are not included here, may balance the budget at the sandy stations. There was no or only weak relationships between (light and dark) DIN exchange and factors like temperature, sedimentary organic content, and oxygen fluxes. Factors related to nutrient fluxes, such as denitrification and nutrient concentration in the overlying water, may have hampered any such relationships. In fact, DIN fluxes at all three stations appeared to be strongly controlled by DIN concentrations in the overlying water. On an annual basis, the sediment appeared to be a net sink for DIN. I N T R O D U C T I O NI n t e r t i d a l areas, like t h e W a d d e n Sea, are c h a r a c t e r i z e d by a h i g h l y f l u c t u a t i n g p h y sical a n d c h e m i c a l e n v i r o n m e n t . B e n t h i c c o m m u n i t i e s ( m i c r o a l g a e , b a c t e r i a a n d a n i m a l s ) in s u c h a r e a s m u s t e n d u r e l a r g e v a r i a t i o n s in factors like t e m p e r a t u r e , salinity, w a v e s a n d c u r r e n t s on t i m e s c a l e s of h o u r s (e.g. d i u r n a l a n d tidal cycles) to m o n t h s (e.g. s e a s o n s ) . In a d d i t i o n , t h e activity of b e n t h i c p r i m a r y p r o d u c e r s a n d d e c o m p o s e r s are h i g h l y d e p e n de n t u p o n t ...

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Fluctuations in the Organic Carbon to Chlorophyll a Ratios for Estuarine Benthic Diatom Populations

Cited by 198 publications

References 22 publications

No limit? The multiphasic uptake of silicic acid by benthic diatoms

No limit? The multiphasic uptake of silicic acid by benthic diatoms

Field measurement of specific growth rate, biomass, and primary production of benthic diatoms of Savin Hill Cove, Boston

Temporal variations in microbenthic metabolism and inorganic nitrogen fluxes in sandy and muddy sediments of a tidally dominated bay in the northern Wadden Sea

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