Annual bacterial production in relation to benthic microalgal production and sediment oxygen uptake in an intertidal sandflat and an intertidal mudflat

Cammen, Leon M.

doi:10.3354/meps071013

Cited by 68 publications

(43 citation statements)

References 29 publications

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“…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). This is within the range of previously reported values from intertidal sandy sediments (Cammen, 1991;Kristensen, 1993). However, only 0-10 % of the seasonal variation in total organic carbon can be accounted for by changes in microphytobenthic biomass.…”

Section: Microbenthic Primary Production and Respirationsupporting

confidence: 74%

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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Section: Microbenthic Primary Production and Respirationsupporting

confidence: 74%

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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“…Meyer-Reil (1983) and Cammen (1982) also reported values of less than 2% for coastal marine sediments. Cammen (1991) confirms our results by proving higher values in the mudflat than in sandy sediments.…”

Section: Discussionsupporting

confidence: 81%

“…This relationship between microbial biomass, microbial production and organic matter in sediments has been described by several authors (e.g. Cole et al 1988;Cammen 1991).…”

Section: Discussionmentioning

confidence: 98%

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Microbial biomass and activity in the vicinity of a mussel bed built up by the blue mussel Mytilus edulis

Stoeck

Albers

2000

Helgoland Marine Research

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Our study focuses on the impact of the biosedimentary system mussel bed (Mytilus edulis) on the spatial variability of benthic microbial biomass and activity in relation to organic deposits. We sampled a transect of six stations from the muddy mussel bed towards a reference station in the sandflat in monthly intervals for 1 year. The sediment grain size fraction <63 µm and the total organic carbon (TOC) concentration decreased significantly towards the sandflat. Bacterial numbers and total microbial biomass (total adenylates) showed a high spatial variability and were not correlated to increasing distance from the mussel bed. However, a significant relationship with the TOC concentration was found. In contrast, the energetic status (adenylate energy charge) of the microbial community in the mussel bed was significantly lower than in the sandflat. A principal component analysis of the substrate-utilization pattern revealed clear differences between the microbial communities in the mussel bed and in the sandflat. Our results indicate that the sandflat may be dominated by a relatively specialized benthic microbial community with an increased efficiency in utilizing organic carbon sources. As a disadvantage, however, such r-strategists are only able to meet environmental changes within a comparatively narrow range. Benthic microbial communities in the vicinity of an M. edulis mussel bed, in contrast, are dominated by relative generalists with a greater physiological capacity to buffer discrete environmental changes. Such K-strategists show a lack of specialization which generally means a reduced efficiency in utilizing a particular resource.

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“…The average organic carbon content of the sediments is given as 0.65 wt% (i.e., 5, 28, and 22 times that of the fine, medium, and coarse sand, respectively), indicating that their data set also included organically rich deposits. The fact that oxygen uptake rates measured in the organically poor sediments of this study were substantially higher confirms that total organic matter content is an inappropriate measure of sediment activity and that oxygen uptake rates of sandy sediments are not necessarily small but can be in the same order than those of finer, organically rich deposits (Andersen and Helder 1987;Cammen 1991).…”

Section: Discussionmentioning

confidence: 54%

Pore‐water advection and solute fluxes in permeable marine sediments (II): Benthic respiration at three sandy sites with different permeabilities (German Bight, North Sea)

Janßen¹,

Huettel²,

Witte³

2005

Limnology & Oceanography

139

102

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This contribution presents total oxygen uptake (TOU) rates and nutrient fluxes of organically poor permeable shelf sands of the German Bight. Measurements have been made in situ with the novel autonomous benthic chamber system Sandy under controlled conditions of advective pore-water exchange. Average oxygen consumption rates of 31.3 Ϯ 18.2 mmol m Ϫ2 d Ϫ1 measured in this study were relatively high as compared with rates reported from shelf sediments with much higher organic contents. TOU of highly permeable medium and coarse grained sands was substantially enhanced in the presence of advection. This indicates that advective oxygen supply contributed significantly to respiration in these sediments and that advection has to be considered when assessing oxygen consumption and organic matter mineralization in shelf areas. In fine-grained, less permeable sands, no effect of advection could be measured. A lower advective oxygen supply in these sediments is in agreement with a release of ammonium instead of nitrate and a shallower oxygen penetration depth. Scaled up to the entire German Bight, the results imply that in 40% of the area an effect of advection on benthic oxygen uptake and other advectionrelated processes can be largely excluded, while in the remaining 60% significant pore-water advection potentially takes place. However, because permeabilities of the sediments investigated in this study were widely spaced, a significant effect on oxygen supply was only verified for highly permeable sands that are likely to cover approximately 3% of the area.Until the 1980s the biogeochemistry of coastal sands has received relatively little attention. Because organic matter content generally decreases with increasing grain size, it seemed that coarse grained sandy deposits lack the substrate to sustain significant biological activity. Sands were therefore considered to be biogeochemical deserts that did not significantly contribute to the cycling of organic matter (Boudreau et al. 2001).A new perception of sandy sediments developed when 1 Corresponding author (fjanssen@mpi-bremen.de).

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Annual bacterial production in relation to benthic microalgal production and sediment oxygen uptake in an intertidal sandflat and an intertidal mudflat

Cited by 68 publications

References 29 publications

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

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

Microbial biomass and activity in the vicinity of a mussel bed built up by the blue mussel Mytilus edulis

Pore‐water advection and solute fluxes in permeable marine sediments (II): Benthic respiration at three sandy sites with different permeabilities (German Bight, North Sea)

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