The importance of water column processes on the dissolution properties of biogenic silica in deep-sea sediments I. Solubility

Gallinari, Morgane; Ragueneau, Olivier; Corrin, Lydie; DeMaster, David J.; Tréguer, Paul

doi:10.1016/s0016-7037(02)00874-8

Cited by 73 publications

(65 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Mean values of between 7 and 9 m d (Waite and Nodder 2001;Gallinari et al 2002). The open-trap data (Fig.…”

Section: Discussionmentioning

confidence: 97%

“…Pulses of wellpreserved diatoms in sediment traps can be traced to episodes of planktonic production, whereas anomalously poorly preserved valves can imply horizontal transport, resuspension of older material or variations in initial quality of biogenic silica (Gallinari et al 2002). Although there is great interannual variability in planktonic species composition (Figs.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Quantitative and qualitative relationships between planktonic diatom communities and diatom assemblages in sedimenting material and surface sediments in Lake Baikal, Siberia

Ryves

Jewson²,

Sturm

et al. 2003

Limnology & Oceanography

110

127

View full text Add to dashboard Cite

Endemic planktonic diatoms are a major component of Lake Baikal sediments during interglacial periods. To investigate how these diatom assemblages are altered during sediment formation, quantitative plankton monitoring (1995)(1996)(1997)(1998) was integrated with sediment trapping over 2 yr (1996)(1997) in Baikal's southern basin (depth ϳ1,400 m). The traps consisted of both open (ϳ6 monthly) and sequential (ϳ2 weekly) collectors deployed throughout the water column. Sedimentation was seasonal, with diatom species composition, valve abundance, and total dry mass reflecting changes in the planktonic communities. Sedimented assemblages were transmitted largely intact to the deepest traps (ϳ1,300-1,390 m); some compositional blurring occurred from differential sinking rates and dissolution of diatom valves. A rapid mass flux event of Aulacoseira skvortzowii and A. baicalensis was recorded in summer 1997 with particle sinking rates between 60 and 100 m d Ϫ1 and dry mass fluxes Ͼ5 g m Ϫ2 d Ϫ1 . Although dissolution was evident for all species, more delicate taxa were preferentially affected (e.g., A. skvortzowii vegetative cells and fine Synedra species), whereas Nitzschia acicularis valves were almost entirely dissolved within the water column. Comparing trap and plankton diatom assemblages with those in nearby core tops demonstrated that a fundamental taphonomic change occurs in the surface sediment, with sedimentary diatom accumulation rates being only about 1% of trap deposition and plankton production rates. Dissolution was significant in explaining 5-30% of species variance between all taphonomic levels (plankton, trap samples, and surface sediments). Results indicate that diatom-based paleoclimatic records in Lake Baikal sediments could be improved and refined by taking taphonomic considerations into account.The transmission of biogenic environmental signals from the upper water column of deep water bodies to the sediment

show abstract

“…Mean values of between 7 and 9 m d (Waite and Nodder 2001;Gallinari et al 2002). The open-trap data (Fig.…”

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Quantitative and qualitative relationships between planktonic diatom communities and diatom assemblages in sedimenting material and surface sediments in Lake Baikal, Siberia

Ryves

Jewson²,

Sturm

et al. 2003

Limnology & Oceanography

110

127

View full text Add to dashboard Cite

show abstract

“…A number of possible explanations for the observed correlations were evaluated as follows: There is obviously no close coupling of BSi and OM in the particle flux to the seafloor and within the sediment which could explain the correlation of Si:O 2 fluxes. Although both BSi and OM are major components of diatoms that are found in certain ratios in the living organisms (Ragueneau et al, 2000, the biogeochemical cycles of silicon and carbon decouple both vertically and horizontally in the water column (Rivkin et al, 1996;Gallinari et al, 2002;Ragueneau et al, 2002). Considering the multitude of water depths, and the different regions investigated, related concentrations in the particle rain reaching the seafloor are highly unlikely.…”

Section: Discussionmentioning

confidence: 99%

Microbial mediation of benthic biogenic silica dissolution

Holstein

Hensen

2009

Geo-Mar Lett

View full text Add to dashboard Cite

Pore water profiles from 24 stations in the South Atlantic (located in the Guinea, Angola, Cape, Guyana, and Argentine basins) show good correlations of oxygen and silicon, suggesting microbially mediated dissolution of biogenic silica. We used simple analytical transport and reaction models to show the tight coupling of the reconstructed process kinetics of aerobic respiration and silicon regeneration. A generic transport and reaction model successfully reproduced the majority of Si pore water profiles from aerobic respiration rates, confirming that the dissolution of biogenic silica (BSi) occurs proportionally to O 2 consumption. Possibly limited to well-oxygenated sediments poor in BSi, benthic Si fluxes can be inferred from O 2 uptake with satisfactory accuracy. Compared to aerobic respiration kinetics, the solubility of BSi emerged as a less influential parameter for silicon regeneration. Understanding the role of bacteria for silicon regeneration requires further investigations, some of which are outlined. The proposed aerobic respiration control of benthic silicon cycling is suitable for benthic-pelagic models. The empirical relation of BSi dissolution to aerobic respiration can be used for regionalization assessments and estimates of the silicon budget to increase the understanding of global primary and export production patterns.

show abstract

“…In a long-term dissolution experiment, we investigated whether differences in shape (and therefore specific surface area), which are known to influence BSi dissolution kinetics (e.g., Lewin 1961;Hurd and Birdwhistell 1983;Gallinari et al 2002), could account for the potential differences in dissolution between diatom frustules and sponge spicules. Using the experimental setup described, we compared the dissolution of (1) T. weissflogii frustules, (8-10 m in diameter, 2-m-high circular hollow boxes; Fig.…”

Section: Methodsmentioning

confidence: 99%

Siliceous sponges as a silicon sink: An overlooked aspect of benthopelagic coupling in the marine silicon cycle

Maldonado

Carmona

Velásquez

et al. 2005

Limnology & Oceanography

151

136

View full text Add to dashboard Cite

Our current understanding of the silicon (Si) cycle in the ocean assumes that diatoms dominate not only the uptake of silicic acid, but also the production and recycling of biogenic silica (BSi), and that other organisms with siliceous skeletons, including sponges, radiolarians, and silicoflagellates, play a negligible role. In this study, we reexamine some aspects of the potential contribution by sponges and present in vitro evidence that BSi in the form of sponge spicules redissolves into silicic acid at far slower rates than those known for diatom frustules. We also show that the retention of Si by siliceous sponges in some sublittoral and bathyal environments is substantial and that sponge populations function as Si sinks. Additionally, by reanalyzing published information on sponge growth and BSi content, we estimate that BSi production rates by sublittoral sponges in Si-poor and Si-rich marine areas fall quite close to values known for diatom assemblages. Therefore, sponges may affect Si cycling dynamics and Si availability for diatoms, particularly in Si-depleted environments. Altogether, our data strongly suggest that the role of sponges in the benthopelagic coupling of the Si cycle is significant.

show abstract

The importance of water column processes on the dissolution properties of biogenic silica in deep-sea sediments I. Solubility

Cited by 73 publications

References 61 publications

Quantitative and qualitative relationships between planktonic diatom communities and diatom assemblages in sedimenting material and surface sediments in Lake Baikal, Siberia

Quantitative and qualitative relationships between planktonic diatom communities and diatom assemblages in sedimenting material and surface sediments in Lake Baikal, Siberia

Microbial mediation of benthic biogenic silica dissolution

Siliceous sponges as a silicon sink: An overlooked aspect of benthopelagic coupling in the marine silicon cycle

Contact Info

Product

Resources

About