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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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All organisms have a position within an ecosystem. The complete set of living and nonliving factors—including food resources, climate, and terrain—that define the position of a given organism are collectively referred to as the organism’s ecological niche.
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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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An ecological disturbance is a temporary disruption in the environment resulting from abiotic, biotic, or anthropogenic factors, causing a pronounced change in an ecosystem. The impact of an ecological disturbance, which can depend on its intensity, frequency, and spatial distribution, plays a significant role in shaping the species diversity within the ecosystem.
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Resource availability modulates biodiversity-invasion relationships by altering competitive interactions.

Tianjie Yang1,2, Zhong Wei1, Ville-Petri Friman3

  • 1Jiangsu Provincial Key Lab for Organic Solid Waste Utilization, National Engineering Research Center for Organic-based Fertilizers, Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing Agricultural University, 210095, Nanjing, People's Republic of China.

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Summary
This summary is machine-generated.

Increasing community diversity and resource availability reduce invasive species growth. Different resident species suppress invaders based on resource levels, making diverse communities more resilient to invasions.

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Area of Science:

  • Ecology
  • Microbiology
  • Biodiversity research

Background:

  • Community diversity influences the success of introduced species through resource competition.
  • Resource availability can modulate competitive interactions, potentially altering biodiversity-invasion relationships.

Purpose of the Study:

  • To investigate how resident community richness, species composition, and resource availability affect the growth of an invasive bacterium, *Ralstonia solanacearum*.
  • To understand the mechanisms underlying biodiversity-invasion dynamics under varying resource conditions.

Main Methods:

  • Assessed the growth of *Ralstonia solanacearum* introduced into bacterial communities of varying richness (1-5 species).
  • Manipulated resource concentrations to examine their effect on invader growth and competitive interactions.
  • Analyzed invader growth in relation to resident community richness, species composition, and resource availability.

Main Results:

  • Increased resident community richness and resource availability significantly reduced the relative density of the invader.
  • At low resources, resident species with high catabolic similarity to the invader were most effective at suppression.
  • At high resources, fast-growing resident species became more critical in suppressing the invader.

Conclusions:

  • The suppressive roles of resident species against invaders are dynamic and shift with resource availability.
  • Diverse communities demonstrate enhanced robustness against invasions due to a varied species pool capable of providing suppressive functions across different environmental conditions.