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2,127 results on '"Keller, W. A."'

6. Field application of a model of proton and metal mixture bioavailability and effects

Author

Tipping, E., Lofts, S., Keller, W., Tipping, E., Lofts, S., and Keller, W.

Abstract

Quantitatively predicting of the responses of freshwater ecosystems to the effects of potentially toxic metals and acidification is an ongoing challenge in ecotoxicology. The WHAM-FTOX model is based on the assumptions that toxic effects of protons and metal cations are additively related to their occupancies of binding sites on organisms, and that those binding sites can be represented by the binding sites of humic acid (HA). We applied the model to simulate the species richness (nsp) of crustacean zooplankton in acid- and metal-contaminated lakes near Sudbury, Ontario between 1973 and 2006. Historic emissions from metal smelters at Sudbury have caused contamination of surrounding lakes by acid deposition, while lakes closest to the smelters were also contaminated with metals, mainly Ni and Cu, and to lesser extents Zn, Cd, and Pb. Changes in water chemistry over the study period show partial recovery as a result of emission reductions. In application, binding of protons and metals to organisms is simulated by applying the WHAM7 model for each water sample. A combined dose term, FTOX,i, is computed for each species within a conceptual assemblage, assuming a distribution of species sensitivities to metals. The probability of finding the species in a sample is then computed from a fixed relationship with FTOX,i, and nsp is computed by summing these probabilities across all species. The distribution of species sensitivities is found by assuming them to be lognormally distributed and fitting their mean and standard deviation. The model was able to describe the variability in nsp well, with an R-squared value of 0.84 (p < 0.0001). Generally, the model reproduces the temporal patterns of nsp in individual lakes well, although it tends to underestimate the rate at which species richness increases as water chemistry recovers. The most important toxic cations were H, Al, Ni, and Cu, with a small contribution from Zn. The predicted contributions of protons and individual met

Published
2023

17. Global data set of long-term summertime vertical temperature profiles in 153 lakes

Author

Pilla, R, Mette, E, Williamson, C, Adamovich, B, Adrian, R, Anneville, O, Balseiro, E, Ban, S, Chandra, S, Colom-Montero, W, Devlin, S, Dix, M, Dokulil, M, Feldsine, N, Feuchtmayr, H, Fogarty, N, Gaiser, E, Girdner, S, Gonzalez, M, Hambright, K, Hamilton, D, Havens, K, Hessen, D, Hetzenauer, H, Higgins, S, Huttula, T, Huuskonen, H, Isles, P, Joehnk, K, Keller, W, Klug, J, Knoll, L, Korhonen, J, Korovchinsky, N, Koster, O, Kraemer, B, Leavitt, P, Leoni, B, Lepori, F, Lepskaya, E, Lottig, N, Luger, M, Maberly, S, Macintyre, S, Mcbride, C, Mcintyre, P, Melles, S, Modenutti, B, Muller-Navarra, D, Pacholski, L, Paterson, A, Pierson, D, Pislegina, H, Plisnier, P, Richardson, D, Rimmer, A, Rogora, M, Rogozin, D, Rusak, J, Rusanovskaya, O, Sadro, S, Salmaso, N, Saros, J, Sarvala, J, Saulnier-Talbot, E, Schindler, D, Shimaraeva, S, Silow, E, Sitoki, L, Sommaruga, R, Straile, D, Strock, K, Swain, H, Tallant, J, Thiery, W, Timofeyev, M, Tolomeev, A, Tominaga, K, Vanni, M, Verburg, P, Vinebrooke, R, Wanzenbock, J, Weathers, K, Weyhenmeyer, G, Zadereev, E, Zhukova, T, Pilla R. M., Mette E. M., Williamson C. E., Adamovich B. V., Adrian R., Anneville O., Balseiro E., Ban S., Chandra S., Colom-Montero W., Devlin S. P., Dix M. A., Dokulil M. T., Feldsine N. A., Feuchtmayr H., Fogarty N. K., Gaiser E. E., Girdner S. F., Gonzalez M. J., Hambright K. D., Hamilton D. P., Havens K., Hessen D. O., Hetzenauer H., Higgins S. N., Huttula T. H., Huuskonen H., Isles P. D. F., Joehnk K. D., Keller W. B., Klug J., Knoll L. B., Korhonen J., Korovchinsky N. M., Koster O., Kraemer B. M., Leavitt P. R., Leoni B., Lepori F., Lepskaya E. V., Lottig N. R., Luger M. S., Maberly S. C., MacIntyre S., McBride C., McIntyre P., Melles S. J., Modenutti B., Muller-Navarra D. C., Pacholski L., Paterson A. M., Pierson D. C., Pislegina H. V., Plisnier P. -D., Richardson D. C., Rimmer A., Rogora M., Rogozin D. Y., Rusak J. A., Rusanovskaya O. O., Sadro S., Salmaso N., Saros J. E., Sarvala J., Saulnier-Talbot E., Schindler D. E., Shimaraeva S. V., Silow E. A., Sitoki L. M., Sommaruga R., Straile D., Strock K. E., Swain H., Tallant J. M., Thiery W., Timofeyev M. A., Tolomeev A. P., Tominaga K., Vanni M. J., Verburg P., Vinebrooke R. D., Wanzenbock J., Weathers K., Weyhenmeyer G. A., Zadereev E. S., Zhukova T. V., Pilla, R, Mette, E, Williamson, C, Adamovich, B, Adrian, R, Anneville, O, Balseiro, E, Ban, S, Chandra, S, Colom-Montero, W, Devlin, S, Dix, M, Dokulil, M, Feldsine, N, Feuchtmayr, H, Fogarty, N, Gaiser, E, Girdner, S, Gonzalez, M, Hambright, K, Hamilton, D, Havens, K, Hessen, D, Hetzenauer, H, Higgins, S, Huttula, T, Huuskonen, H, Isles, P, Joehnk, K, Keller, W, Klug, J, Knoll, L, Korhonen, J, Korovchinsky, N, Koster, O, Kraemer, B, Leavitt, P, Leoni, B, Lepori, F, Lepskaya, E, Lottig, N, Luger, M, Maberly, S, Macintyre, S, Mcbride, C, Mcintyre, P, Melles, S, Modenutti, B, Muller-Navarra, D, Pacholski, L, Paterson, A, Pierson, D, Pislegina, H, Plisnier, P, Richardson, D, Rimmer, A, Rogora, M, Rogozin, D, Rusak, J, Rusanovskaya, O, Sadro, S, Salmaso, N, Saros, J, Sarvala, J, Saulnier-Talbot, E, Schindler, D, Shimaraeva, S, Silow, E, Sitoki, L, Sommaruga, R, Straile, D, Strock, K, Swain, H, Tallant, J, Thiery, W, Timofeyev, M, Tolomeev, A, Tominaga, K, Vanni, M, Verburg, P, Vinebrooke, R, Wanzenbock, J, Weathers, K, Weyhenmeyer, G, Zadereev, E, Zhukova, T, Pilla R. M., Mette E. M., Williamson C. E., Adamovich B. V., Adrian R., Anneville O., Balseiro E., Ban S., Chandra S., Colom-Montero W., Devlin S. P., Dix M. A., Dokulil M. T., Feldsine N. A., Feuchtmayr H., Fogarty N. K., Gaiser E. E., Girdner S. F., Gonzalez M. J., Hambright K. D., Hamilton D. P., Havens K., Hessen D. O., Hetzenauer H., Higgins S. N., Huttula T. H., Huuskonen H., Isles P. D. F., Joehnk K. D., Keller W. B., Klug J., Knoll L. B., Korhonen J., Korovchinsky N. M., Koster O., Kraemer B. M., Leavitt P. R., Leoni B., Lepori F., Lepskaya E. V., Lottig N. R., Luger M. S., Maberly S. C., MacIntyre S., McBride C., McIntyre P., Melles S. J., Modenutti B., Muller-Navarra D. C., Pacholski L., Paterson A. M., Pierson D. C., Pislegina H. V., Plisnier P. -D., Richardson D. C., Rimmer A., Rogora M., Rogozin D. Y., Rusak J. A., Rusanovskaya O. O., Sadro S., Salmaso N., Saros J. E., Sarvala J., Saulnier-Talbot E., Schindler D. E., Shimaraeva S. V., Silow E. A., Sitoki L. M., Sommaruga R., Straile D., Strock K. E., Swain H., Tallant J. M., Thiery W., Timofeyev M. A., Tolomeev A. P., Tominaga K., Vanni M. J., Verburg P., Vinebrooke R. D., Wanzenbock J., Weathers K., Weyhenmeyer G. A., Zadereev E. S., and Zhukova T. V.

Abstract

Climate change and other anthropogenic stressors have led to long-term changes in the thermal structure, including surface temperatures, deepwater temperatures, and vertical thermal gradients, in many lakes around the world. Though many studies highlight warming of surface water temperatures in lakes worldwide, less is known about long-term trends in full vertical thermal structure and deepwater temperatures, which have been changing less consistently in both direction and magnitude. Here, we present a globally-expansive data set of summertime in-situ vertical temperature profiles from 153 lakes, with one time series beginning as early as 1894. We also compiled lake geographic, morphometric, and water quality variables that can influence vertical thermal structure through a variety of potential mechanisms in these lakes. These long-term time series of vertical temperature profiles and corresponding lake characteristics serve as valuable data to help understand changes and drivers of lake thermal structure in a time of rapid global and ecological change.

Published
2021

30. GRACE Gradiometer

Author

Sharifi, M.A., Keller, W., Sansò, Fernando, editor, Jekeli, Christopher, editor, Bastos, Luisa, editor, and Fernandes, Joana, editor

Published
2005
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32. A novel self-assembly mechanism for the S-layer in Lactobacillus acidophilus

Author

Sagmeister, T., primary, Buhlheller, C., additional, Gubensaek, N., additional, Eder, M., additional, Grininger, C., additional, Petrowitsch, L., additional, Medina, A., additional, Millán, C., additional, Usón, I., additional, Vejzović, Đ., additional, Damisch, E., additional, Keller, W., additional, and Pavkov-Keller, T., additional

Published
2022
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