Add to ORKGUnderstanding the factors that favor the establishment and the persistance of harmful algal blooms (HABs) is essential for predicting them, and subsequently mitigating their negative consequences on the marine environment, human health and the economy. Allelochemical potency, i.e. the release of compounds that inhibit competitors, is hypothesized to favor the organisms that produce them and indeed shapes plankton community. The toxic dinoflagellates from the genus Alexandrium produce allelochemicals, however, associated interactions are poorly understood. The objective of this thesis is to contribute to our understanding by studying the mechanisms behind the allelochemical interactions between the dinoflagellate A. minutum and the diatom Ch...