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5. Effect of phosphorus limitation on elemental composition and stable carbon isotope fractionation in a marine diatom growing under different [CO.sub.2] concentrations

Author

Gervais, Frank and Riebesell, Ulf

Subjects
Diatoms -- Research, Water bloom -- Research, Earth sciences
Abstract

Blooms of the marine diatom Skeletonema costatum were initiated in closed-system batch cultures with P-deficient medium under two different initial concentrations of dissolved molecular [CO.sub.2] ([[CO.sub.2,aq]]: 20.6 and 4.5 [micro]mol [L.sup.-1]). Algal C : N : P ratios strongly increased with decreasing P concentration. In the exponential growth phase, C : N ratios were 1.3 mol [mol.sup.-1] higher in the low relative to the high [CO.sub.2,aq] treatment. There was no [[CO.sub.2,aq]] effect on C : N : P ratios during P-limited growth. Carbon isotope fractionation ([[Epsilon].sub.p]) was 2-3%o higher in the high [[CO.sub.2,aq]] treatment. With growth rate decreasing due to P limitation, [[Epsilon].sub.p] increased in both [[CO.sub.2,aq]] treatments by 2-3%o despite decreasing [[CO.sub.2,aq]]. Under these conditions the effect of decreasing growth rate on isotope fractionation strongly dominated over that of declining [CO.sub.2] availability. When extrapolated to the natural environment, these results imply that systematic changes in algal growth, as occurring during the course of phytoplankton blooms, may affect algal isotope fractionation. These results severely complicate the interpretation of carbon isotope measurements in suspended and sedimentary organic matter.

Published
2001

6. Synthesis of iron fertilization experiments: from the Iron Age in the Age of Enlightenment.

Author

de Baar, Hein J. W., Boyd, Philipp W., Coale, Kenneth H., Landry, Michael R., Tsuda, Atsushi, Assmy, Philipp, Bakker, Dorothee C. E., Bozec, Yann, Barber, Richard T., Brzezinski, Mark A., Buesseler, Ken O., Boyé, Marie, Croot, Peter, Gervais, Frank, Gorbunov, Maxim Y., Harrison, Paul J., Hiscock, William T., Laan, Patrick, Lancelot, Christiane, Law, Cliff S., Levasseur, Maurice, Marchetti, Aadrain, Millero, Frnak J., Nishioka, Jun, Nojiri, Yukihiro, van Oijen, Tim, Riebesell, Ulf, Rijkenberg, Micha J. A., Saito, Hiroaki, Takeda, Shigenobu, Timmermans, Klaas R, Veldhuis, Marcel J. W., Waite, Anya M., Wong, Chi-Shing, de Baar, Hein J. W., Boyd, Philipp W., Coale, Kenneth H., Landry, Michael R., Tsuda, Atsushi, Assmy, Philipp, Bakker, Dorothee C. E., Bozec, Yann, Barber, Richard T., Brzezinski, Mark A., Buesseler, Ken O., Boyé, Marie, Croot, Peter, Gervais, Frank, Gorbunov, Maxim Y., Harrison, Paul J., Hiscock, William T., Laan, Patrick, Lancelot, Christiane, Law, Cliff S., Levasseur, Maurice, Marchetti, Aadrain, Millero, Frnak J., Nishioka, Jun, Nojiri, Yukihiro, van Oijen, Tim, Riebesell, Ulf, Rijkenberg, Micha J. A., Saito, Hiroaki, Takeda, Shigenobu, Timmermans, Klaas R, Veldhuis, Marcel J. W., Waite, Anya M., and Wong, Chi-Shing

Published
2005
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9. Synthesis of iron fertilization experiments: From the Iron Age in the Age of Enlightenment

Author

de Baar, Hein J. W., primary, Boyd, Philip W., additional, Coale, Kenneth H., additional, Landry, Michael R., additional, Tsuda, Atsushi, additional, Assmy, Philipp, additional, Bakker, Dorothee C. E., additional, Bozec, Yann, additional, Barber, Richard T., additional, Brzezinski, Mark A., additional, Buesseler, Ken O., additional, Boyé, Marie, additional, Croot, Peter L., additional, Gervais, Frank, additional, Gorbunov, Maxim Y., additional, Harrison, Paul J., additional, Hiscock, William T., additional, Laan, Patrick, additional, Lancelot, Christiane, additional, Law, Cliff S., additional, Levasseur, Maurice, additional, Marchetti, Adrian, additional, Millero, Frank J., additional, Nishioka, Jun, additional, Nojiri, Yukihiro, additional, van Oijen, Tim, additional, Riebesell, Ulf, additional, Rijkenberg, Micha J. A., additional, Saito, Hiroaki, additional, Takeda, Shigenobu, additional, Timmermans, Klaas R., additional, Veldhuis, Marcel J. W., additional, Waite, Anya M., additional, and Wong, Chi‐Shing, additional

Published
2005
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12. Trophic Characterization, Pelagic Food Web Structure and Comparison of Two Mesotrophic Lakes in Brandenburg (Germany)

Author

Kasprzak, Peter, primary, Gervais, Frank, additional, Adrian, Rita, additional, Weiler, Winfried, additional, Radke, Robert, additional, Jäger, Ines, additional, Riest, Silke, additional, Siedel, Ulrike, additional, Schneider, Beate, additional, Böhme, Michael, additional, Eckmann, Reiner, additional, and Walz, Norbert, additional

Published
2000
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