Non-Native Species, Novel Ecosystems, and the Future of Biodiversity in a Transforming Biosphere

Human-driven environmental change has set in motion the largest global biotic reorganization in millions of years. Climate shifts, land-use transformation, defaunation, and species translocations are collectively reshaping ecological networks and altering the equilibria that have historically maintained biodiversity. In this changing biosphere, non-native species—long viewed primarily as threats—are integral to emerging ecological dynamics, acting through fundamental mechanisms that both erode and sustain diversity.

Across ecosystems, introduced organisms influence trophic interactions, resource use, and disturbance regimes, thereby affecting the basic mechanisms shaping biodiversity. These processes unfold amid profound climatic disequilibria and persistent human legacies, driving an expansion of self-organizing ecosystems without historical precedent. The question is no longer whether non-native species will shape future biodiversity, but how their roles will interact with changing environmental and ecological conditions to define the composition, structure, and function of tomorrow’s ecosystems.

Understanding these transitions requires a mechanistic focus—on competition, facilitation, trophic regulation, hybridization, and mutualistic reassembly—rather than on species’ origins. Global synthesis reveals that interacting novelty drivers, including climate change, defaunation, and floristic reconfiguration, now affect most of the terrestrial biosphere. Within this context, ecosystem functioning and evolutionary potential increasingly depend on the adaptive capacity of mixed assemblages. Whether this transformation leads to homogenization and biodiversity loss, or to diversification and new stable states, will hinge on how geographic dynamics, functional complementarity, and environmental heterogeneity are maintained.

Looking forward, biodiversity stewardship must emphasize process persistence and disequilibrium management over static composition—sustaining the flows of energy, materials, and information that underpin ecological and evolutionary renewal, along with mechanisms promoting biodiversity maintenance. Integrating macroecological foresight, long-term experimentation, and adaptive restoration can help steer ecosystems along trajectories that maintain high diversity and functional resilience. Non-native species are part of this reality—not as categorical enemies, but as agents whose roles must be understood, anticipated, and directed to sustain life’s diversity in the deep future.