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The 5th meeting of the Isotopes in Biogenic Silica Working Group was held 4-6 April 2011 in Antwerp, Belgium.

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Meeting Programme 

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Day 1 April 4 2011 

11:30 – 12:45 Registration 

 

Session 1: Biological Si conversions at the land-sea interface

Chair: Prof. Patrick Meire, University of Antwerp 

12:45 – 13:00 Symposium opening

13:00 – 13:30 Keynote speaker Olivier Ragueneau, Université de Brest: Invasive species and downslope transport of sediment: two overlooked processes affecting Si transfer from land to ocean.

13:30 – 13:50 Talk 1 Carbonnel V., Chou L., et al. Dissolved and biogenic silica dynamics in the Scheldt tidal system

13:50 – 14:10 Talk 2 Carey J. & Fulweiler W. The impact of nutrient enrichment on Si accumulation in two temperate salt marshes

14:10 – 14:30 Talk 3 Müller F. et al. The effect of grazing on silica cycling in salt marshes

14:30 – 14:50 Talk 4 Vandevenne F. et al. Agricultural silica harvest: Have men created a new loop in the global silica cycle?

14:50 – 15:40 Coffee-break 

 

Session 2: Methodology

Chair: Prof. Christina de la Rocha, Université de Bretagne Occidentale

15:40 – 16:00 Talk 6 Conley D.J. The ins and outs of the measurement for “biogenic silica”. How did we get there?

16:00 – 16:20 Talk 7 Chapligin et al. Final results from the inter-laboratory comparison of δ18O from biogenic silica

 

Session 3: Isotope applications in biogenic Si research: the ocean and coastal environment

Chair: Prof. Christina de la Rocha, Université de Bretagne Occidentale

16:20 – 16:40 Talk 8 Shemesh A. & Abelmann A. Oxygen isotopes in radiolaria – a potential tool for paleoceanography

16:40 – 17:00 Talk 9 Wetzel F. et al. A record of diatom Si isotope variations of the last 170 ka from the Southern Ocean (ODP Site 1093)

17:00 – 17:20 Talk 10 Reynolds B. et al. Opal records of abrupt changes in the Southern Ocean over termination II 

17:20 – 17:40 Talk 11 de Souza et al. The combined biological-physical control on the oceanic cycle of Si: insights from silicon isotopes.

 

17:45 – 19:30 Ice breaker with guest introduction by: Hodson M. et al.: Silicon: beer, barley, bones and Belgium.

20:30 – 22:30 Optional dinner 

Those who subscribed for the optional dinner, visited the “Pakhuis”, one of Antwerp’s last home breweries, serving their own ale with traditional Belgian style food!

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Day 2 April 5 2011 

08:30 – 13:00 Optional excursion (including lunch) or Free time 

 

Session 3 continued: Isotope applications in biogenic Si research: the ocean and coastal environment

Chair: Dr. Philip Barker, Lancaster University

13:00 – 13:20 Talk 12 Fripiat F. et al. Silicon isotopic constrain on the Southern Ocean Si-biogeochemical cycle

13:20 – 13:40 Talk 13 Coffineau N. et al. δ30Si of DSi in the Atlantic and Indian sectors of the Southern Ocean.

13:40 – 14:00 Talk 14 Berg S. et al. Oxygen, carbon and silicon isotopes of diatom silica as indicators for Holocene environmental change in coastal East Antarctica

14:00 – 14:20 Talk 15 Swann G. Understanding abrupt changes in marine records of diatom δ18O

14:20 – 14:40 Talk 16 Leng M. et al. A diatom oxygen isotope record from the Holocene marine sediments off the Antarctic Margin

14:40 – 15:00 Talk 17 Snelling A. et al. The first late quaternary δ18O record from the West Antarctic Peninsula continental margin

15:00 – 15:45 Coffee-break 

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Session 4: Biogeochemical silica cycling from land to ocean

Chair: Prof. Wally Fulweiler, Boston University

15:45 – 16:15 Keynote speaker Phillippe Van Cappellen, Georgia Tech University: Back to Basics: A Material Science View of the Biogeochemical Cycle of Silicon

16:15 – 16:35 Talk 18 Hartmann J. et al. Regional and global scale dissolved silica fluxes to the coastal zone

16:35 – 16:55 Talk 19 Michalopoulos P. et al. Reactive silica and organic matter associations in Mississippi Delta sediments: implications for organic matter burial and preservation

16:55 – 17:15 Talk 20 Garnier J. et al. Silica transformations and transfer in the Seine basin: N,P, Si stoichiometry and eutrophication indicator

17:15 – 17:35 Talk 21 Clymans W. et al. Anthropogenic impacts on biogenic Si pools in temperate soils

17:35 – 17:55 Talk 22 Kokfelt U. et al. Diatoms and environmental change in peatlands

 

Session 5: Poster session (posters also on display through whole symposium)

• Poster 1: Smis A. et al. The effect of grazing on the biological silicon buffer in subarctic ecosystems (Finnmark, Northern Norway)

• Poster 2: Pashley V. & Horstwood M. Measurement of Si isotopes using high resolution and high sensitivity multi-collector inductively coupled plasma mass spectrometry

• Poster 3: Ryves D. et al. Critically testing the role of δ30Sidiatom as a novel productivity signal and δ18Odiatom as an indicator of climate variability in temperate lakes: project overview

• Poster 4: Webb M. et al. Biomonitoring of water quality: a new isotope-based method from carbon in lentic and lotic diatoms.

• Poster 5: Tallberg P. et al. Multiple uses of biogenic Si when studying small Arctic lakes in Finnish Lapland.

• Poster 6: Siipola V. Dissolution of diatoms during extraction of adsorbed silicon from sediment samples.

• Poster 7: Ronchi B. et al. Dissolution of Si in forest soil.

• Poster 8: Barao L. et al. An innovative method to analyse biogenic silica in terrestrial soils.

• Poster 9: Puppe D. et al. The protozoic Si pool in soils – quantification and driving factors

• Poster 10: Panizzo V. et al. Holocene productivity of the Southern Ocean, east Antarctica

• Poster 11: Lehtimäki M. & Tallberg Seasonal variation in the distribution and abundance of different silicon fractions in the Vantaa river estuary

• Poster 12: Hughes H. et al. Dissolved Si isotopes as a tracer of diatoms activity in Ugandan crater lakes

• Poster 13: Geilert S. et al. An experimental approach to determine silicon isotope fractionation using flowthrough reactors

• Poster 14: Egan K. et al Diatom size and species effects on δ30Si: a core top study

• Poster 15: Clymans W. et al. Amorphous silica analysis in terrestrial runoff samples

• Poster 16: Chawchai S. et al. A biogenic silica record from Lake Kumphawapi, a tropical wetland in Northeastern Thailand.

• Poster 17: Bal K. et al. The re-growth capacity of branched bur-reed and broad-leaved pondweed in relation towards its silicon content.

• Poster 18: Weiss A. et al. A long-term dataset of Si concentrations and fluxes in the Elbe river and estuary.

 

19:30 – ... Symposium dinner

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Day 3 April 6 2011 

 

Session 6: Current research on isotope applications in biogenic Si research in the terrestrial environment

Chair: Prof. Daniel Conley, Lund University

9:30 – 10:00 Keynote speaker Jean-Thomas Cornelis, Université Catholique de Louvain-la-Neuve: The Si biocycling in soil-plant systems - isotopical and geochemical applications 

10:00 – 10:20 Talk 23 Basile-Doelsch I. et al. Si isotopic composition of SiO2 polymorphs in silicified ultramaphic rocks

10:20 – 10:40 Talk 24 Sun X. et al. Climate dependent diatom production is preserved in biogenic Si isotope signature

10:40 – 11:10 Coffee-break

11:10 – 11:30 Talk 25  Opfergelt S. et al. Impact of freshwater diatom productivity on silicon isotopes and silicon fluxes: Lake Myvatn, Iceland

11:30 – 11:50 Talk 26 Mackay A. et al. A reassessment of late glacial – Holocene diatom oxygen isotope record from Lake Baikal using a geochemical mass-balance approach

11:50 – 12:10 Talk 27 Cockerton H. et al. Later quaternary variations in the silicon flux from the river Nile to the Mediterranean: silicon-isotope evidence from lacustrine diatoms

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12:10 – 12:30 Symposium close