Collective Ecological Protection: A Systems-Level Theory of Microbial Community Stability

Microbial communities persist under recurrent abiotic and biotic disturbance, yet the organizational basis of this persistence remains incompletely explained. Existing frameworks describe resistance, resilience, functional redundancy, social evolution, and ecological networks, but do not explicitly define how demonstrated protective effects are distributed among community members or whether this distribution predicts stability beyond diversity, composition, and functional potential. Here, we propose the Collective Ecological Protection Theory (CEPT), a systems-level framework in which stability is influenced by a protective architecture: the directed, weighted, disturbance- and response-specific network through which the activity of a provider increases the persistence or functional performance of a recipient relative to a matched counterfactual. CEPT separates protective mechanisms from their organization and identifies six candidate descriptors: protective coverage, protective redundancy, mechanistic complementarity, spatial reach, modularity, and dependency concentration. Protection is context dependent and may be weakened by spatial separation, correlated failure, costly cooperation, exploitation, or dependence on a small number of providers. We derive four discriminating predictions based on matched-community rewiring, targeted provider loss, independent protection, and architectural reconstruction during recovery. CEPT receives support to the extent that independently measured protective architecture improves causal or out-of-sample prediction of a specified stability response beyond established compositional, functional, and environmental factors. It therefore offers a testable organizational explanation for how distinct protective processes combine to influence microbial resistance, persistence, recovery, and maintenance of function. By identifying distributed protection and single points of failure, CEPT may also provide a mechanistic basis for assessing ecological vulnerability and risk in disturbed microbial systems.