Fixation of dissolved silicate and sedimentation of biogenic silicate in the lower river Rhine during diatom blooms

Admiraal, Wim; Breugem, P.; Jacobs, D. M. L. H. A.; Steveninck, E. D. de Ruyter van

doi:10.1007/bf00692170

Cited by 77 publications

(42 citation statements)

References 21 publications

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“…Additional retention of DSi can occur in main stems of rivers and is closely related to anthropogenic influence on nitrogen (N) and phosphorus (P) levels. Significant amounts of BSi resulting from plankton blooms can be sedimented in flood plains (Admiraal et al, 1990). As early data from European rivers suggests (see above), DSi retention due to N and P fertilization may possibly occur since the middle of the 19th century (Roth, 1879).…”

Section: Towards Spatial Estimates Of Net River Inputs To Oceansmentioning

confidence: 82%

“…in lakes and flood plains, is linked to their trophic state (for DSi), to lake abundance, expressed by the limnic index (% of lake cover in a given area, i.e. % of area covered by lakes with respect to the total catchment basin area -this value can attain up to 20% at the ∼1 M km 2 scale regarded here) , and by deposition of ASi in alluvial plains (Admiraal et al, 1990). The commonly reported retention for DSi extends from 4 to more than 100 g SiO 2 , with a median value of 20 ± 10 g SiO 2 , per year per m 2 of lake area (Campy and Meybeck, 1995).…”

Section: Database For Dsi and Psi In River Waters And Particulate Mattermentioning

confidence: 99%

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Global spatial distribution of natural riverine silica inputs to the coastal zone

et al. 2011

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Abstract. Silica, SiO 2 , in dissolved (DSi) and particulate (PSi) form, is both a major product of continental weathering as well as an essential nutrient in terrestrial and aquatic systems. Here we present estimates of the spatial distribution of riverine silica fluxes under natural conditions, i.e. without human influence, to ∼140 segments of the global coastal zone. Focussing on the construction of the DSi budget, natural DSi concentration is multiplied with discharge of rivers for each segment for documented basins and segments. Segments with no documentation available are estimated using clustered information based mainly on considerations of local lithology, climate, and lake retention. We approximate fluxes of particulate silica in various forms (PSi) from fluxes of suspended matter, calculated from existing models. Results have been established for silica fluxes, concentrations and yields for drainage basins of the different continents, oceans basins as well as coastal segment basins. For the continental surfaces actually draining into the oceans (exorheic regions, representing 114.7 million (M) km 2 ), 371 M t y −1 of DSi and 8835 M t y −1 of PSi are transported, corresponding to a mean concentration of 9.5 mg l −1 and 226 mg l −1 , and to a mean yield of 3.3 t km −2 y −1 and 77 t km −2 y −1 , respectively. DSi yields exceeding 6.6 t km −2 y −1 , i.e. >2× the global average, represent 17.4% of the global continental icefree exorheic area but correspond to 56.0% of DSi fluxes. Pacific catchments hold most of the hyper-active areas (>5× global average), suggesting a close connection between tecCorrespondence to: H. H. Dürr (h.durr@geo.uu.nl) tonic activity and DSi fluxes resulting from silicate weathering. The macro-filters of regional and marginal seas intercept 33% and 46% of the total dissolved and particulate silica fluxes. The mass of DSi received from rivers per unit square area of various oceans ranges over more than one order of magnitude. When expressed per unit volume and when individual regional seas are considered this figure ranges over two to three orders of magnitude, an illustration of the heterogeneity of the land to sea connection.

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Section: Towards Spatial Estimates Of Net River Inputs To Oceansmentioning

confidence: 82%

Section: Database For Dsi and Psi In River Waters And Particulate Mattermentioning

confidence: 99%

Global spatial distribution of natural riverine silica inputs to the coastal zone

et al. 2011

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“…This is supported by the study of Sahu et al (2012), showing that high salinity supported high diatom diversity. Admiraal et al (1990), Polat and Işık (2002), and Alp and Sen (2010), on the other hand, showed a negative relation between diatom abundance and nutrients. They represent the K-type growth strategy, able to grow in stressful conditions and develop the ability to harvest more light (Saunders, 2011;Smayda and Reynolds, 2001).…”

Section: Discussionmentioning

confidence: 99%

Spatiotemporal distribution in phytoplankton community with distinct salinity regimes along the Mandovi estuary, Goa, India

Pednekar¹,

Kerkar

Matondkar³

2014

Turk J Bot

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Seasonal variations in the composition and abundance of phytoplankton were investigated fortnightly at 3 different regions along the Mandovi estuary from June 2007 to May 2008 in relation to salinity and nutrients. A total of 209 species belonging to 7 divisions were identified during the study period. The highest phytoplankton cell density (5.17 × 10 4 cells L -1 ) and biomass (7.68 mg m -3 chlorophyll a) were observed in the upper sections during the nonmonsoon period, while the highest diversity (3.46) was observed in the upper section during the monsoon period. Bacillariophyta was the dominant phytoplankton group at 71% of the total species identified. This group was dominated by Pennales (88) over Centrales (60) at all 3 stations. Contributions of Dinophyta, Chlorophyta, Cyanophyta, Haptophyta, Chromophyta, and Chrysophyta to the total species were 25%, 0.5%, 1%, 0.5%, 1%, and 1%, respectively. Dinophyta did not show significant variations in percentage distribution among the 3 sections and seasons. Twenty-six dominant species of phytoplankton, representing all seasons with cell density of >1000 cells L -1 , showed spatial adaptability patterns with respect to salinity. Protoperidinium acbromaticum and Alexandrium ostenfeldii were found to grow only during nonmonsoon periods in upper sections and were reported for first time in the present study. Euryhaline Skeletonema costatum and Thalassiothrix frauenfeldii were present throughout the study period. A total of 36 harmful algal bloom-forming species, with 11 toxin-producing species, have been identified. The presence of Streptotheca thamensis acts as an indicator to evaluate water quality.

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“…Anderson (1986) stated that biological productivity is higher in the tidal freshwater reach because of reduced turbidity (and hence reduction of its limiting effect on light) as opposed to the turbidity maximum region along the increasing salinity gradient. Diatom growth may affect DSi concentration in the estuaries through uptake (Admiraal et al, 1990;Hughes et al, 2011). In addition, anthropogenic activities such as damming may decrease DSi by favouring BSi retention in the reservoirs (Conley, 2002;Friedl et al, 2004;Laruelle et al, 2009;Hughes et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Silicon cycle in Indian estuaries and its control by biogeochemical and anthropogenic processes

Mangalaa

Cardinal

Brajard

et al. 2017

Continental Shelf Research

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We study the silicon biogeochemical cycle and its associated parameters in 24 and 18 Indian estuaries during dry and wet periods respectively. We focus more specifically on dissolved Si (DSi), amorphous Si (ASi,) lithogenic Si (LSi), Particulate Organic Carbon (POC), Total Suspended Material (TSM), Dissolved Inorganic Nitrogen (DIN), salinity and fucoxanthin, a marker pigment for diatoms. Overall, we show that the estuaries have strong inter and intra variability of their biogeochemical parameters both seasonally and along salinity gradients. Based on Principal Component Analysis and clustering of categorised (upper and lower) estuaries, we discuss the four major processes controlling the Si variability of Indian estuaries: 1) lithogenic supply, 2) diatom uptake, 3) mixing of sea water and, 4) land use. The influence of lithogenic control is significantly higher during the wet period than during the dry period, due to a higher particle supply through monsoonal discharge. A significant diatom uptake is only identified in the estuaries during dry period. By taking into account the non-conservative nature of Si and by extrapolating our results, we estimate the fluxes from the Indian subcontinent of DSi, ASi, LSi to the Bay of Bengal (211 ± 32, 10 ± 4.7, 2028 ± 317 Gmol) and Arabian Sea (80 ± 15, 7 ± 1.1, 1717 ± 932 Gmol). We show the impact of land use in watersheds with higher levels of agricultural activity amplifies the supply of Si to the coastal Bay of Bengal during the wet season. In contrast, forest cover and steep slopes cause less Si supply to the Arabian Sea by restricting erosion when entering the estuary. Finally, Si:N ratios show that nitrogen is always in deficit relative to silicon for diatom growth, these high Si:N ratios likely contribute to the prevention of eutrophication in the Indian estuaries and coastal sea.

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Fixation of dissolved silicate and sedimentation of biogenic silicate in the lower river Rhine during diatom blooms

Cited by 77 publications

References 21 publications

Global spatial distribution of natural riverine silica inputs to the coastal zone

Global spatial distribution of natural riverine silica inputs to the coastal zone

Spatiotemporal distribution in phytoplankton community with distinct salinity regimes along the Mandovi estuary, Goa, India

Silicon cycle in Indian estuaries and its control by biogeochemical and anthropogenic processes

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