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Marc-André's research program focuses on processes underlying species response to human activities, mainly at the population level. He is especially interested in landscape-level processes such as dispersal, and ecosystem-level processes influencing the survival of nests and juveniles, as well as recruitment rate. He and his students use approaches ranging from intensive spot mapping surveys and monitoring of banded populations to stable isotope analysis to examine population dynamics under various degrees of habitat loss, fragmentation, or degradation. His research interests also include the behavioural response of individuals to nest predation risk and to various habitat alterations associated with forest management, agriculture, or other human activities.