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Related Concept Videos

Competition02:34

Competition

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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.
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When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
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Short-distance transport refers to transport that occurs over a distance of just 2-3 cells, crossing the plasma membrane in the process. Small uncharged molecules, such as oxygen, carbon dioxide, and water, can diffuse across the plasma membrane on their own. In contrast, ions and larger molecules require the assistance of transport proteins due to their charge or size. Transport across membranes also occurs within individual cells, playing a variety of essential roles for the plant as a whole.
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Microbe-plant interactions represent a dynamic spectrum of associations shaped by intricate chemical signaling. These interactions can be neutral, beneficial, or detrimental, and profoundly influence plant physiology, growth, and ecosystem function. The plant microbiome, comprising bacteria, fungi, archaea, protists, and viruses, plays a pivotal role in mediating these effects through surface colonization, internal colonization, or systemic symbiosis.Mutualistic associations, particularly with...
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Related Experiment Video

Updated: Mar 28, 2026

Experimental Protocol for Manipulating Plant-induced Soil Heterogeneity
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Plant functional traits have globally consistent effects on competition.

Georges Kunstler1,2,3, Daniel Falster3, David A Coomes4

  • 1Irstea, UR EMGR, 2 rue de la Papeterie BP-76, F-38402, St-Martin-d'Hères, France.

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Plant functional traits like wood density and leaf area influence competition, affecting how species coexist in forests globally. These traits create trade-offs between performance with and without competition, impacting community assembly.

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Area of Science:

  • Ecology
  • Plant Biology
  • Forest Science

Background:

  • Phenotypic traits consistently affect individual plant physiology.
  • The scaling of these effects on interspecific competition remains unclear.
  • Competition is a key driver of terrestrial vegetation community assembly.

Purpose of the Study:

  • To investigate how key functional traits influence competitive interactions in trees.
  • To determine if trait-based competition models can generalize across global forest ecosystems.

Main Methods:

  • Utilized growth data from over 3 million trees across 140,000 global plots.
  • Analyzed the influence of wood density, specific leaf area, and maximum height on competitive interactions.

Main Results:

  • Fast growth correlated negatively with wood density and positively with specific leaf area across biomes.
  • Low wood density and high specific leaf area were associated with reduced competitive ability and effect.
  • Intraspecific competition was stronger than interspecific competition.
  • Trait dissimilarity showed minimal impact on weakening interspecific competition.

Conclusions:

  • Plant functional traits create trade-offs influencing competitive dynamics and species coexistence.
  • A trait-based approach enables generalized competition modeling across diverse global forests.