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188 results on '"Håkanson, L."'

21. Climate related marine ecosystem changes

Author

Jw, Dippner, Bodungen, B., Vuorinen, I., Dahlmann, G., Daunys, D., Flinkman, J., Hagen, E., Halkka, A., Marianne Holmer, Håkanson, L., Fw, Köster, Lehikoinen, E., Br, Mackenzie, Möllmann, C., Møhlenberg, F., Olenin, S., Scheibe, R., Schiedek, D., Skov, H., Sofiev, M., Steingrube, W., and Wasmund, N.

Published
2008

22. The state of Lake Simcoe (Ontario, Canada): The effects of multiple stressors on phosphorus and oxygen dynamics

Author

North, R. L., Barton, D., Crowe, A. S., Dillon, P. J., Dolson, R. M.L., Evans, D. O., Ginn, B. K., Håkanson, L., Hawryshyn, J., Jarjanazi, H., King, J. W., La Rose, J. K.L., León, L., Lewis, C. F.M., Liddle, G. E., Lin, Z. H., Longstaffe, F. J., Macdonald, R. A., Molot, L., Ozersky, T., Palmer, M. E., Quinlan, R., Rennie, M. D., Robillard, M. M., Rodé, D., Rühland, K. M., Schwalb, A., Smol, J. P., Stainsby, E., Trumpickas, J. J., Winter, J. G., Young, J. D., North, R. L., Barton, D., Crowe, A. S., Dillon, P. J., Dolson, R. M.L., Evans, D. O., Ginn, B. K., Håkanson, L., Hawryshyn, J., Jarjanazi, H., King, J. W., La Rose, J. K.L., León, L., Lewis, C. F.M., Liddle, G. E., Lin, Z. H., Longstaffe, F. J., Macdonald, R. A., Molot, L., Ozersky, T., Palmer, M. E., Quinlan, R., Rennie, M. D., Robillard, M. M., Rodé, D., Rühland, K. M., Schwalb, A., Smol, J. P., Stainsby, E., Trumpickas, J. J., Winter, J. G., and Young, J. D.

Abstract

Lake Simcoe, the largest lake in southern Ontario outside of the Laurentian Great Lakes, is affected by numerous stressors including eutrophication resulting from total phosphorus (TP) loading, climate change, and invasions of exotic species. We synthesized the long-term responses of Lake Simcoe to these stressors by assessing trends in water quality and biological composition over multiple trophic levels. Evidence for climate change included increasing thermal stabilityof the lake and changes in subfossil diatom communities over time. Although the deep water dissolved oxygen (O2) minimumhas increased significantly since TP load reductions, it is still below estimated historical values and the Lake Simcoe Protection Plan end-of-summer target level of 7 mg O2 L-1. Low deep water O2 concentrations corresponded with a decline in coldwater fish abundance. Since 1980, some nutrient concentrations have decreased (spring TP) while others have increased (silica), but many show no obvious changes (ice-free TP, nitrate, ammonium). Increases in water clarity, combined with declines in chlorophyll a and phytoplankton biovolumes in Cook's Bay, were temporally consistent with declines in TPloading and the lake-wide establishment of dreissenid mussels as a major component of the Lake Simcoe ecosystem. Using an investigative tool, we identified 2 periods when abrupt shifts potentially occurred in multiple parameters: 1986 and 1995-1997. Additional ecosystem level changes such as declines in zooplankton, declines in offshore benthic invertebrate abundance, and increased nearshore invertebrate abundance likely reflect the effects of invasive species. The interaction of these multiple stressors have significantly altered the Lake Simcoe ecosystem. © Her Majesty the Queen in Right of Canada, as represented by Environment Canada 2013.

Published
2013

23. Environmental Modelling for Radiation Safety (EMRAS): a summary report of the results of the EMRAS programme (2003–2007)

Author

Aign, J., Al-Khayat, T., Al-Masri, M., Amado, V., Amano, H., Ammann, M., Andersson, K.G., Angeli, G., Arapis, G., Arkhipov, A., Atanassov, D., Atarashi-Andoh, M., Balonov, M., Barbeau, C., Barnett, C.L., Barraclough, I., Barros, H., Bartusková, M., Batandjieva, B., Baumgärtner, F., Beaugelin-Seiller, K., Belli, M., Belot, Y., Benovich, I., Beresford, N.A., Berkovskyy, V., Birky, B., Bossew, P., Boyer, C., Boyer, P., Brennwald, M., Brittain, J.E., Brown, J.E., Calmon, P., Cancio, D., Canoba, A., Carini, F., Charnock, T.W., Cheng, J.-J., Choi, Y., Ciffroy, P., Colle, C., Conney, S., Copplestone, D., Cutts, D., Davis, P., Doi, M., Dovlete, C., Duffa, C., Durrieu, G., Dzyuba, N., Ehlken, S., Fesenko, S., Filistovic, V., Galeriu, D., Gallay, F., Garcia-Sanchez, L., García-Tenorio, R., Garnier, J.-M., Gaschak, S., Gehrcke, K., Gerler, J., Gerzabek, M.H., Gil-García, C.J., Golikov, V., Golovan, O., Golubev, A., Golubeva, V., Gondin da Fonseca, A., Goutal, N., Guetat, P., Gulden, W., Håkanson, L., Harris, F., Heling, R., Hilton, J., Hingston, J.L., Hofman, D., Homma, T., Horyna, J., Hosseini, A., Howard, B.J., Hubmer, A., Hwang, W.T., Inaba, J., Inoue, Y., Ioannides, K., Isamov, N., Ivanova, K., Jackson, D., James, J., Jourdain, F., Jova Sed, L., Juri, Ayub, J., Kaiser, J.C., Kakiuchi, H., Kamboj, S., Kanyár, B., Kashparov, V., Kawaguchi, I., Kennedy, P., Kirchner, G., Kivva, S., Koarashi, J., Konoplev, A., Koshebutskyy, V., Koukouliou, V., Kozar Lagar, J., Krajewski, P., Krasnov, V., Krizman, M., Krylov, A., Kryshev, A., Kryshev, I., Laptev, G., Leclerc, E., LeDizès-Maurel, S., Lee, C., Lee, H., Lettner, H., Linsley, G., Louvat, D., Luck, M., Maderich, V., Madoz-Escande, C., Magro, L., Malátová, I., Marks, P., Martin, P., Masuda, T., Mavrin, S., McDonald, P., Melintescu, A., Miyamoto, K., Momoshima, N., Monte, L., Montfort, M., Nedveckaite, T., Neves, F., Nitzsche, O., Nosov, A., Nuccetelli, C., O'Brien, R., Olyslaegers, G., Organo, C., Orlov, O., Paganini Fioratti, M., Palsson, S.E., Patryl, L., Periañez, R., Pérez-Sánchez, D., Peterson, S.R., Pröhl, G., Quintana, E., Rantavaara, A., Raskob, W., Ravi, P.M., Reed, E., Rigol, A., Rudya, K., Saito, M., Sanina, K., Sansone, U., Santucci, P., Sanzharova, N., Saxén, R., Sazykina, T., Servant-Perrier, A., Setlow, L., Shang, Z.R., Shaw, G., Shubina, O., Siclet, F., Simon, S., Sitnikov, S., Sizonenko, V.P., Skuterud, L., Slávik, O., Smith, K., Smith, J.T., Steiner, M., Strebl, F., Suh, K.-S., Suolanen, V., Sweeck, L., Tagami, K., Takeda, H., Tamponnet, C., Telleria, D., Thiessen, K.M., Thiry, Y., Thorne, M., Tomás Zerquera, J., Torri, G., Treebushny, D., Trifunovic, D., Tsatsi, L., Uchida, S., Vandenhove, H., Varga, B., Velasco, H., Venter, A., Vichot, L., Vidal, M., Vives i Batlle, J., Vives-Lynch, S., Vlasov, O., Voigt, G., Waggitt, P., Webbe-Wood, D., Wierczinski, B., Wood, M.D., Yamamoto, K., Yankovich, T., Yu, C., Zeevaert, T., Zeiller, L., Zelmer, R., Zheleznyak, M., Zibold, G., Zlobenko, B., Zvonova, I., Aign, J., Al-Khayat, T., Al-Masri, M., Amado, V., Amano, H., Ammann, M., Andersson, K.G., Angeli, G., Arapis, G., Arkhipov, A., Atanassov, D., Atarashi-Andoh, M., Balonov, M., Barbeau, C., Barnett, C.L., Barraclough, I., Barros, H., Bartusková, M., Batandjieva, B., Baumgärtner, F., Beaugelin-Seiller, K., Belli, M., Belot, Y., Benovich, I., Beresford, N.A., Berkovskyy, V., Birky, B., Bossew, P., Boyer, C., Boyer, P., Brennwald, M., Brittain, J.E., Brown, J.E., Calmon, P., Cancio, D., Canoba, A., Carini, F., Charnock, T.W., Cheng, J.-J., Choi, Y., Ciffroy, P., Colle, C., Conney, S., Copplestone, D., Cutts, D., Davis, P., Doi, M., Dovlete, C., Duffa, C., Durrieu, G., Dzyuba, N., Ehlken, S., Fesenko, S., Filistovic, V., Galeriu, D., Gallay, F., Garcia-Sanchez, L., García-Tenorio, R., Garnier, J.-M., Gaschak, S., Gehrcke, K., Gerler, J., Gerzabek, M.H., Gil-García, C.J., Golikov, V., Golovan, O., Golubev, A., Golubeva, V., Gondin da Fonseca, A., Goutal, N., Guetat, P., Gulden, W., Håkanson, L., Harris, F., Heling, R., Hilton, J., Hingston, J.L., Hofman, D., Homma, T., Horyna, J., Hosseini, A., Howard, B.J., Hubmer, A., Hwang, W.T., Inaba, J., Inoue, Y., Ioannides, K., Isamov, N., Ivanova, K., Jackson, D., James, J., Jourdain, F., Jova Sed, L., Juri, Ayub, J., Kaiser, J.C., Kakiuchi, H., Kamboj, S., Kanyár, B., Kashparov, V., Kawaguchi, I., Kennedy, P., Kirchner, G., Kivva, S., Koarashi, J., Konoplev, A., Koshebutskyy, V., Koukouliou, V., Kozar Lagar, J., Krajewski, P., Krasnov, V., Krizman, M., Krylov, A., Kryshev, A., Kryshev, I., Laptev, G., Leclerc, E., LeDizès-Maurel, S., Lee, C., Lee, H., Lettner, H., Linsley, G., Louvat, D., Luck, M., Maderich, V., Madoz-Escande, C., Magro, L., Malátová, I., Marks, P., Martin, P., Masuda, T., Mavrin, S., McDonald, P., Melintescu, A., Miyamoto, K., Momoshima, N., Monte, L., Montfort, M., Nedveckaite, T., Neves, F., Nitzsche, O., Nosov, A., Nuccetelli, C., O'Brien, R., Olyslaegers, G., Organo, C., Orlov, O., Paganini Fioratti, M., Palsson, S.E., Patryl, L., Periañez, R., Pérez-Sánchez, D., Peterson, S.R., Pröhl, G., Quintana, E., Rantavaara, A., Raskob, W., Ravi, P.M., Reed, E., Rigol, A., Rudya, K., Saito, M., Sanina, K., Sansone, U., Santucci, P., Sanzharova, N., Saxén, R., Sazykina, T., Servant-Perrier, A., Setlow, L., Shang, Z.R., Shaw, G., Shubina, O., Siclet, F., Simon, S., Sitnikov, S., Sizonenko, V.P., Skuterud, L., Slávik, O., Smith, K., Smith, J.T., Steiner, M., Strebl, F., Suh, K.-S., Suolanen, V., Sweeck, L., Tagami, K., Takeda, H., Tamponnet, C., Telleria, D., Thiessen, K.M., Thiry, Y., Thorne, M., Tomás Zerquera, J., Torri, G., Treebushny, D., Trifunovic, D., Tsatsi, L., Uchida, S., Vandenhove, H., Varga, B., Velasco, H., Venter, A., Vichot, L., Vidal, M., Vives i Batlle, J., Vives-Lynch, S., Vlasov, O., Voigt, G., Waggitt, P., Webbe-Wood, D., Wierczinski, B., Wood, M.D., Yamamoto, K., Yankovich, T., Yu, C., Zeevaert, T., Zeiller, L., Zelmer, R., Zheleznyak, M., Zibold, G., Zlobenko, B., and Zvonova, I.

Published
2012

24. Challenges and opportunities for integrating lake ecosystem modelling approaches

Author

Mooij, W. M. Trolle, D. Jeppesen, E. Arhonditsis, G. Belolipetsky, P. V. Chitamwebwa, D. B. R. Degermendzhy, A. G. DeAngelis, D. L. De Senerpont Domis, L. N. Downing, A. S. Elliott, J. A. Fragoso Jr, C. R. Gaedke, U. Genova, S. N. Gulati, R. D. Håkanson, L. Hamilton, D. P. Hipsey, M. R. t Hoen, J. Hülsmann, S. Los, F. H. Makler-Pick, V. Petzoldt, T. Prokopkin, I. G. Rinke, K. Schep, S. A. Tominaga, K. van Dam, A. A. van Nes, E. H. Wells, S. A. Janse, J. H. and Mooij, W. M. Trolle, D. Jeppesen, E. Arhonditsis, G. Belolipetsky, P. V. Chitamwebwa, D. B. R. Degermendzhy, A. G. DeAngelis, D. L. De Senerpont Domis, L. N. Downing, A. S. Elliott, J. A. Fragoso Jr, C. R. Gaedke, U. Genova, S. N. Gulati, R. D. Håkanson, L. Hamilton, D. P. Hipsey, M. R. t Hoen, J. Hülsmann, S. Los, F. H. Makler-Pick, V. Petzoldt, T. Prokopkin, I. G. Rinke, K. Schep, S. A. Tominaga, K. van Dam, A. A. van Nes, E. H. Wells, S. A. Janse, J. H.

Abstract

A large number and wide variety of lake ecosystem models have been developed and published during the past four decades. We identify two challenges for making further progress in this field. One such challenge is to avoid developing more models largely following the concept of others (‘reinventing the wheel’). The other challenge is to avoid focusing on only one type of model, while ignoring new and diverse approaches that have become available (‘having tunnel vision’). In this paper, we aim at improving the awareness of existing models and knowledge of concurrent approaches in lake ecosystem modelling, without covering all possible model tools and avenues. First, we present a broad variety of modelling approaches. To illustrate these approaches, we give brief descriptions of rather arbitrarily selected sets of specific models. We deal with static models (steady state and regression models), complex dynamic models (CAEDYM, CE-QUAL-W2, Delft 3D-ECO, LakeMab, LakeWeb, MyLake, PCLake, PROTECH, SALMO), structurally dynamic models and minimal dynamic models. We also discuss a group of approaches that could all be classified as individual based: super-individual models (Piscator, Charisma), physiologically structured models, stage-structured models and trait-based models. We briefly mention genetic algorithms, neural networks, Kalman filters and fuzzy logic. Thereafter, we zoom in, as an in-depth example, on the multi-decadal development and application of the lake ecosystem model PCLake and related models (PCLake Metamodel, Lake Shira Model, IPH-TRIM3D-PCLake). In the discussion, we argue that while the historical development of each approach and model is understandable given its ‘leading principle’, there are many opportunities for combining approaches. We take the point of view that a single ‘right’ approach does not exist and should not be strived for. Instead, multiple modelling approaches, applied concurrently to a given problem, can help develop an integrative view

Published
2010
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25. Challenges and opportunities for integrating lake ecosystem modelling approaches

Author

Mooij, W.M., Trolle, D., Jeppesen, E., Arhonditsis, G., Belolipetsky, P., Chitamwebwa, D.B.R., Degermendzhy, A.G., DeAngelis, D.L., De Senerpont Domis, L.N., Downing, A.S., Elliott, J.A., Fragoso Jr., C.R., Gaedke, U., Genova, S.N., Gulati, R.D., Håkanson, L., Hamilton, D.P., Hipsey, M.R., ‘t Hoen, P.J., Hülsmann, S., Los, F.J., Makler-Pick, V., Petzoldt, T., Prokopkin, I., Rinke, K., Schep, S.A., Tominaga, K., Van Dam, A.A., van Nes, E.H., Wells, S.A., Janse, J.H., Mooij, W.M., Trolle, D., Jeppesen, E., Arhonditsis, G., Belolipetsky, P., Chitamwebwa, D.B.R., Degermendzhy, A.G., DeAngelis, D.L., De Senerpont Domis, L.N., Downing, A.S., Elliott, J.A., Fragoso Jr., C.R., Gaedke, U., Genova, S.N., Gulati, R.D., Håkanson, L., Hamilton, D.P., Hipsey, M.R., ‘t Hoen, P.J., Hülsmann, S., Los, F.J., Makler-Pick, V., Petzoldt, T., Prokopkin, I., Rinke, K., Schep, S.A., Tominaga, K., Van Dam, A.A., van Nes, E.H., Wells, S.A., and Janse, J.H.

Abstract

A large number and wide variety of lake ecosystem models have been developed and published during the past four decades. We identify two challenges for making further progress in this field. One such challenge is to avoid developing more models largely following the concept of others (‘reinventing the wheel’). The other challenge is to avoid focusing on only one type of model, while ignoring new and diverse approaches that have become available (‘having tunnel vision’). In this paper, we aim at improving the awareness of existing models and knowledge of concurrent approaches in lake ecosystem modelling, without covering all possible model tools and avenues. First, we present a broad variety of modelling approaches. To illustrate these approaches, we give brief descriptions of rather arbitrarily selected sets of specific models. We deal with static models (steady state and regression models), complex dynamic models (CAEDYM, CE-QUAL-W2, Delft 3D-ECO, LakeMab, LakeWeb, MyLake, PCLake, PROTECH, SALMO), structurally dynamic models and minimal dynamic models. We also discuss a group of approaches that could all be classified as individual based: super-individual models (Piscator, Charisma), physiologically structured models, stage-structured models and trait-based models. We briefly mention genetic algorithms, neural networks, Kalman filters and fuzzy logic. Thereafter, we zoom in, as an in-depth example, on the multi-decadal development and application of the lake ecosystem model PCLake and related models (PCLake Metamodel, Lake Shira Model, IPH-TRIM3D-PCLake). In the discussion, we argue that while the historical development of each approach and model is understandable given its ‘leading principle’, there are many opportunities for combining approaches. We take the point of view that a single ‘right’ approach does not exist and should not be strived for. Instead, multiple modelling approaches, applied concurrently to a given problem, can help develop an integrative view, A large number and wide variety of lake ecosystem models have been developed and published during the past four decades. We identify two challenges for making further progress in this field. One such challenge is to avoid developing more models largely following the concept of others (‘reinventing the wheel’). The other challenge is to avoid focusing on only one type of model, while ignoring new and diverse approaches that have become available (‘having tunnel vision’). In this paper, we aim at improving the awareness of existing models and knowledge of concurrent approaches in lake ecosystem modelling, without covering all possible model tools and avenues. First, we present a broad variety of modelling approaches. To illustrate these approaches, we give brief descriptions of rather arbitrarily selected sets of specific models. We deal with static models (steady state and regression models), complex dynamic models (CAEDYM, CE-QUAL-W2, Delft 3D-ECO, LakeMab, LakeWeb, MyLake, PCLake, PROTECH, SALMO), structurally dynamic models and minimal dynamic models. We also discuss a group of approaches that could all be classified as individual based: super-individual models (Piscator, Charisma), physiologically structured models, stage-structured models and trait-based models. We briefly mention genetic algorithms, neural networks, Kalman filters and fuzzy logic. Thereafter, we zoom in, as an in-depth example, on the multi-decadal development and application of the lake ecosystem model PCLake and related models (PCLake Metamodel, Lake Shira Model, IPH-TRIM3D-PCLake). In the discussion, we argue that while the historical development of each approach and model is understandable given its ‘leading principle’, there are many opportunities for combining approaches. We take the point of view that a single ‘right’ approach does not exist and should not be strived for. Instead, multiple modelling approaches, applied concurrently to a given problem, can help develop an integrative view

Published
2010

31. The Baltic Sea

Author

Håkanson, L., Lundin, L-C., Savchuk, O., Ionov, V., Musielak, S. and Furmanczyk, K. and Håkanson, L., Lundin, L-C., Savchuk, O., Ionov, V., Musielak, S. and Furmanczyk, K.

Published
2003

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