The multiscale feedback theory of biodiversity

Area of Science:

• Ecology
• Evolutionary Biology
• Plant Science

Background:

• Ecosystems exhibit feedback loops between plants and their environment, influencing individual organisms and entire ecosystems.
• Community-level negative feedback promotes local species diversity.
• Plant-driven ecosystem engineering can lead to local dominance through positive feedback.

Purpose of the Study:

• To explore the correlation between local and regional processes influencing ecological diversity.
• To investigate the relationship between historical environmental conditions and the prevalence of positive versus negative feedback mechanisms.
• To understand the evolutionary trajectories of plant communities transitioning between diversity and dominance.

Main Methods:

• The study proposes a theoretical framework linking feedback mechanisms to species pool size and historical habitat conditions.
• It synthesizes existing ecological and evolutionary principles to explain observed patterns in plant communities.
• No specific experiments were detailed; the focus is on conceptual synthesis.

Main Results:

• Community-level negative feedback is predominant in large species pools originating from historically common environments.
• Ecosystem-level positive feedback is more apparent in historically restricted habitats.
• Evolutionary processes, given sufficient time and space, can drive transitions between feedback-dominated systems.

Conclusions:

• Local and regional processes shaping diversity are interconnected.
• Species-poor systems may diversify, but new monodominants can emerge through migration or adaptation.
• The interplay between negative and positive feedbacks, influenced by historical context, shapes ecosystem structure and diversity over evolutionary timescales.