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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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Ecological Niches02:02

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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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Cell sizes vary widely among and within organisms. Bacterial cells range between 1-10 micrometers (μm)and are considerably smaller than most eukaryotic cells. The smallest bacteria are 0.1 μm in diameter—about a thousand times smaller than eukaryotic cells, which typically range from 10-100 μm.
Surface Area
Cells can take in nutrients and water via diffusion through the plasma membrane itself or through specific channels in the membrane. The area of the membrane surrounding...
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Limits to Natural Selection01:38

Limits to Natural Selection

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Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly adapted organisms. Several factors constrain natural selection.
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Energy Budgets00:51

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Organisms must balance energy intake with the energy required for growth, maintenance and reproduction. These trade-offs result in a variety of survivorship and reproductive strategies, including semelparity and iteroparity. Semelparous species, like annual plants, have only one reproductive episode in their lifetimes and consequently have short lifespans. Iteroparous species, by contrast, have many reproductive events during their lifetimes but have relatively few offspring. These two...
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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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Updated: Jul 26, 2025

Monitoring Spatial Segregation in Surface Colonizing Microbial Populations
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Smaller is better in competition for space.

Athmanathan Senthilnathan1

  • 1Department of Ecology and Evolutionary Biology, University of Tennessee, Knoxville, TN 37996, USA.

Proceedings. Biological Sciences
|June 20, 2023
PubMed
Summary

Competition for space offers a surprising advantage to smaller organisms, driving natural selection towards smaller body sizes. This challenges the traditional view that larger size is always better in ecology.

Keywords:
body sizepopulation dynamicsspace competition

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Theoretical Biology

Background:

  • Body size is a key trait influencing organismal life, energy budgets (metabolic theory of ecology), and spatial dynamics.
  • While large body size is often assumed advantageous, the ecological benefits of small body size remain an area of ecological inquiry.
  • Spatial processes and resource competition are critical factors in shaping organismal traits.

Purpose of the Study:

  • To investigate the role of spatial competition in selecting for body size.
  • To determine if competition for space can create an advantage for smaller individuals.
  • To explore the conditions under which natural selection might favor smaller body sizes.

Main Methods:

  • Developed deterministic and stochastic population dynamics models.
  • Simulated populations with discrete and continuously varying body sizes.
  • Incorporated birth, death, and dispersal processes within spatial competition frameworks.

Main Results:

  • Models demonstrated that competition for space inherently favors smaller body sizes.
  • Smaller individuals consistently survived and reproduced more effectively in spatial competition scenarios.
  • The advantage of small body size in spatial competition could only be overridden by strong natural selection for large body size.

Conclusions:

  • Competition for space provides a novel, significant benefit to smaller organisms.
  • Ecological pressures, specifically spatial competition, can drive evolutionary trends towards smaller body size.
  • Understanding the interplay between body size, spatial dynamics, and competition is crucial in evolutionary ecology.