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A process-based metacommunity framework linking local and regional scale community ecology.

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Area of Science:

  • Community Ecology
  • Metacommunity Dynamics
  • Ecological Theory

Background:

  • The metacommunity concept integrates local and regional ecological dynamics.
  • Existing metacommunity frameworks often rely on discrete archetypes (e.g., neutral theory, species sorting).
  • There is a need to incorporate local species interactions and coexistence mechanisms into metacommunity theory.

Purpose of the Study:

  • To fundamentally reconceptualize metacommunity framework by explicitly linking local coexistence theory with spatial processes.
  • To allow for a continuous range of competitive community dynamics within metacommunity theory.
  • To explore how underlying ecological processes interact to shape metacommunities.

Main Methods:

  • Developed a reconceptualized metacommunity framework.
  • Formalized the framework using a simulation model.
  • Varied the strength of three core processes: density-independent responses to abiotic conditions, density-dependent biotic interactions, and dispersal.

Main Results:

  • Demonstrated how existing metacommunity theories are linked by these three core processes.
  • Showed that stochasticity influences the demographic realization of these processes.
  • Generated new hypotheses regarding the interactive effects of these processes on community diversity, functioning, and stability.

Conclusions:

  • The proposed framework provides a unified approach to understanding metacommunity dynamics.
  • It bridges the gap between local coexistence mechanisms and regional spatial processes.
  • This reconceptualization allows for a more nuanced and continuous understanding of ecological community assembly and dynamics.