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Pierre's research program is focusing on the patterns and processes that are structuring bird assemblages in naturally disturbed and timber managed landscapes, particularly with regards to the cavity-nesting bird community and its complex biotic interactions. This research is aimed at determining conservation targets that allow persistence of birds in managed landscapes and reduce the gap with landscapes under natural disturbance regimes. He and his students use field approaches that range from point counts, playbacks and spot-mapping to nest monitoring of breeding bird populations in landscapes under different disturbance dynamics (natural and human-induced). His research interests also include food webs with regards to trophic links between birds, saproxylic insects and decaying trees in forest ecosystems.