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Nonlinear Dynamics Nonlinear Dynamics and Shifts in Shifts in Ecosystems

  • Autores: Flora Souza Bacelar
  • Directores de la Tesis: Claudio R. Mirasso Santos (dir. tes.), Emilio Hernández García (dir. tes.)
  • Lectura: En la Universitat de les Illes Balears ( España ) en 2010
  • Idioma: inglés
  • Materias:
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    • This work started in the scope of the“Thresholds of Environmental Sustainability” project (http://www.thresholds-eu.org) that was an integrated project in which the study of ecological discontinuities and thresholds effects as the consequence of human perturbations on ecological systems were the main related aspects. There I had the opportunity to work with two different streams, Stream 2: Thresholds and points of no-return: thresholds de?nition, theory and identi?cation and Stream 4: Thresholds and drivers of contaminants. Researchers in the Stream 4 developed several kinds of experiments and collected data from them. Speci?cally they performed a mesocosm experiment which had the main purpose to study effects of pyrene as a contaminant on a pelagic system including three trophic levels (algae, bacteria, zooplankton), under two nutrient conditions. Such a experiment was used to investigate direct and indirect effects of the contaminant on the studied species. Firstly my collaborators and I tried to propose models that could validate these experimental data, however our studies drove into a different path with a more general point of view, others in the group kept working in the original direction. Hence I could contribute with two different works studying regime shifts of marine ecosystems, not just considering the pyrenne case. One related to marine trophic chains affected by contaminants, changing differently the mortalities in each trophic level. And another work related to effects of eutrophication process in shallow marine ecosystems and competition between ?oating and submerged algae.


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