Emergent neutrality in consumer-resource dynamics

PLoS Comput Biol. 2020 Jul 30;16(7):e1008102. doi: 10.1371/journal.pcbi.1008102. eCollection 2020 Jul.

Abstract

Neutral theory assumes all species and individuals in a community are ecologically equivalent. This controversial hypothesis has been tested across many taxonomic groups and environmental contexts, and successfully predicts species abundance distributions across multiple high-diversity communities. However, it has been critiqued for its failure to predict a broader range of community properties, particularly regarding community dynamics from generational to geological timescales. Moreover, it is unclear whether neutrality can ever be a true description of a community given the ubiquity of interspecific differences, which presumably lead to ecological inequivalences. Here we derive analytical predictions for when and why non-neutral communities of consumers and resources may present neutral-like outcomes, which we verify using numerical simulations. Our results, which span both static and dynamical community properties, demonstrate the limitations of summarizing distributions to detect non-neutrality, and provide a potential explanation for the successes of neutral theory as a description of macroecological pattern.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Biodiversity*
  • Biological Evolution
  • Computational Biology
  • Computer Simulation
  • Ecosystem
  • Models, Biological*
  • Stochastic Processes

Grants and funding

JPO was funded by Simons Foundation Grant #376199 (www.simonsfoundation.org) and McDonnell Foundation Grant #220020439 (www.jsmf.org). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.