Raphael Tremblay

Student Speaker | Étudiant.e
In ecosystems, matter such as detritus can have different roles like being recycled and consumed by organisms (resource effect) or acting as substrate or a structural component of the environment (non-resource effect). As most ecological models focus on one or the other of these roles, the consequences of the trade-off between resource and non-resource effects remain largely unknown. To look into these trophic dynamics, we developed a two-patch meta-ecosystem model where each patch can host 4 ecosystem compartments. One compartment is the nutrient in its inorganic form and the three others represent nutrient stocks in organic matter (here divided into producer, herbivore, and detritus). Using this model, we aim at getting an understanding of species stability and persistence in response to nutrient having both resource and non-resource effects in the meta-ecosystem. More precisely, we intend on predicting how the (1) type and form of interactions between resource and non-resource effects and (2) spatial flows of matter explain the relationship between species persistence and ecosystem functions. This knowledge will be relevant to ecosystem-based management that can integrate flows of matter through their structural and resource impacts on ecosystem services.