Anthropogenic activities can release toxic substances in the environments, affecting them and their biota. One group of these toxic substances is the metals, some being used for the correct development of organism - essentials, like copper - while others are not used - non-essentials, like cadmium. In aquatic environment, metals can affect primary production of algae, base of the trophic chain, altering the functioning of the system and the trophic chain, reaching humans. Zooplankton need lipids in quantity and quality enough for their correct development and reproduction, obtaining them from food. However, exposure to metals can affect the lipid composition of organisms (phyto- and zooplankton), resulting in a less healthier food or with deleterious effects to the consumers in higher trophic levels, especially in the case of the metals that bioaccumulate and biomagnify. The aim of present proposal is to evaluate the effects caused by limitation of nutrients - nitrogen and phosphorus - in algae of different families and naturally with different capacities to synthesize fatty acids and how these algae affect the consumers. With this proposal, we intend to figure out the mechanisms involved in contaminants transfer through the trophic chain, observe if there are alterations in the organisms according to the new scenarios, using some kind of adaptation to reduce the damages and try understanding if the exposure for some time can be reversible if we return the organisms to the "optimal" culture conditions.
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