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Ecological succession is influenced by the processes of facilitation, inhibition, and toleration. Facilitation occurs when early successional species create more favorable ecological conditions for subsequent species, such as enhanced nutrient, water, or light availability. In contrast, inhibition happens when early successional species create unfavorable ecological conditions for potential successive species, such as limiting resource availability. In some cases, later successional species...
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Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
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Automatic Image Processing to Determine the Community Size Structure of Riverine Macroinvertebrates
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A simulation-based framework to explore the importance of non-selection and selection processes in structuring

Danilo Cândido Vieira1,2, Gustavo Fonseca3,4

  • 1Centro de Estudos do Mar, Universidade Federal do Paraná, Caixa Postal 50.002, Pontal do Paraná, PR, 83255-000, Brazil. vieiradc@yahoo.com.br.

Oecologia
|June 22, 2019
PubMed
Summary

This study introduces a pattern-oriented modeling framework to distinguish between selection and dispersion in ecological communities. The model successfully predicted community patterns, highlighting the dominance of selection in structuring species assemblages.

Keywords:
DispersalEnvironmental boundaryEnvironmental filteringNiche breadthPattern-oriented modelling

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Area of Science:

  • Ecology
  • Community Ecology
  • Ecological Modeling

Background:

  • Ecological communities are structured by complex interactions between species.
  • Understanding the relative importance of ecological selection and dispersal is crucial for community assembly theory.
  • Existing methods often struggle to disentangle these two key processes.

Purpose of the Study:

  • To develop and validate a novel framework for identifying the relative importance of selection and dispersion in structuring ecological communities.
  • To quantify the contribution of selection and non-selection processes to observed species patterns.
  • To provide a method for classifying species along a selection/non-selection continuum.

Main Methods:

  • A pattern-oriented modeling approach was employed, involving five key steps.
  • Simulations of communities were generated under varying degrees of dispersal and selection.
  • A composite model was built using environmental boundary (EB) and niche breadth (NB) metrics, validated against empirical data from marine nematodes.

Main Results:

  • The composite model successfully encompassed 96% of observed species and predicted three independent community patterns (abundance-rank, spatial, and environmental gradients).
  • Selection-driven parameter sets explained a higher proportion (85%) of observed species compared to non-selection sets (34%).
  • Species niche metrics (EB and NB) were sensitive to dispersal levels, decreasing with reduced dispersal.

Conclusions:

  • The pattern-oriented modeling framework effectively distinguishes between ecological selection and dispersal processes.
  • The approach provides a robust method for understanding species-specific contributions to community assembly.
  • Integrating empirical niche measurements with model-generated expectations enhances insights into ecological community dynamics.