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Related Concept Videos

Competition02:34

Competition

When organisms require the same limited resources within an environment, they may have to compete for them. Competition is a net-negative interaction. Even if two competing individuals or populations do not interact directly, the overall fitness of both competitors is lowered as a result of not having full access to the limited resource.Intraspecific competition, which occurs between individuals of the same species, serves as a natural mechanism for regulating population size. Too much...
Diversity of Protists III01:27

Diversity of Protists III

Rhizaria are a diverse group of unicellular protists characterized by their threadlike cytoplasmic extensions known as pseudopodia. These structures aid in both locomotion and feeding, giving Rhizaria an amoeboid appearance. Their amoeboid morphology once led to taxonomic confusion, but molecular phylogenetics has clarified their evolutionary placement and emphasized their shared use of pseudopodia despite divergent lineages.This clade comprises diverse lineages such as Chlorarachniophyta,...
Inclusive Fitness00:57

Inclusive Fitness

Most altruistic behavior—in which one animal helps another at a cost to themselves—occurs between relatives. Scientists think these altruistic behaviors evolved because they increase the inclusive fitness of the animal providing help.
Microbial Interactions: Competition01:26

Microbial Interactions: Competition

Microbial competition is an ecological interaction in which microorganisms vie for limited resources within shared environments. These resources may include nutrients, space, or light, depending on the system. The intensity and outcome of competition are influenced by the environmental context, such as nutrient availability, spatial constraints, and the diversity of microbial species present. These competitive interactions significantly influence the structure, function, and resilience of...
Understanding Species and Reproductive Barriers01:17

Understanding Species and Reproductive Barriers

A species is a group of organisms that interbreed and produce fertile offspring. Typically, individuals of the same species appear similar and share common characteristics due to their highly similar genomes. However, not all organisms that look alike are members of the same species. Various mechanisms keep most species discrete. While some mechanisms prevent reproductive behavior and fertilization (pre-zygotic isolation), others prevent the production of fertile offspring after mating has...
Diversity of Protists IV01:27

Diversity of Protists IV

Amoebozoa represent a diverse group of terrestrial and aquatic protists that utilize lobe-shaped pseudopodia for locomotion and feeding. This characteristic differentiates them from the Rhizaria, which possess threadlike pseudopodia. The primary classifications within Amoebozoa include gymnamoebas, entamoebas, and the plasmodial and cellular slime molds. Phylogenetic evidence indicates that Amoebozoa diverged from a lineage that ultimately gave rise to fungi and animals.Gymnamoebas and...

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Related Experiment Video

Updated: Jul 12, 2026

Coral Reef Arks: An In Situ Mesocosm and Toolkit for Assembling Reef Communities
07:59

Coral Reef Arks: An In Situ Mesocosm and Toolkit for Assembling Reef Communities

Published on: January 6, 2023

Guild Structure in Coral Reef Fishes Does Not Conform to Competitive Exclusion-Based Assembly Rules.

Simon P Um1, John W Turnbull1,2, Emma L Johnston1,2

  • 1School of Life and Environmental Sciences, Faculty of Science University of Sydney Sydney New South Wales Australia.

Ecology and Evolution
|July 10, 2026
PubMed
Summary

Competition does not strongly shape coral reef fish communities. Species within feeding guilds co-occurred more often than expected, suggesting competitive exclusion is not a primary driver of community structure in this Great Barrier Reef system.

Keywords:
assembly rulescommunity assemblycooccurrencescoral reef fishguild proportionality

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Area of Science:

  • Marine Biology
  • Ecology
  • Community Ecology

Background:

  • Coral reef fish communities exhibit high species richness and apparent niche overlap.
  • Competition is documented locally, but its community-level impact on structure and composition is unclear.

Purpose of the Study:

  • To investigate if competition-based models explain species occurrences within feeding guilds in a reef fish metacommunity.
  • To infer if competitive exclusion shapes community assembly in the studied system.

Main Methods:

  • Utilized presence-absence data from underwater fish surveys at One Tree Island, Great Barrier Reef.
  • Partitioned fish community into feeding guilds.
  • Applied null-model analyses to test Diamond's co-occurrence and Wilson's guild proportionality rules.

Main Results:

  • Neither assembly rule prediction was supported by the data.
  • Species within guilds co-occurred as frequently or more frequently than null expectations.
  • Guild composition showed greater variation across sites than predicted by exclusion-based models.

Conclusions:

  • Exclusion-based assembly rules do not strongly describe guild-level structure in this coral reef fish metacommunity.
  • Evidence of local competitive interactions may not extrapolate to community assembly patterns in species-rich systems.