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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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Predator-Prey Interactions02:39

Predator-Prey Interactions

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Predators consume prey for energy. Predators that acquire prey and prey that avoid predation both increase their chances of survival and reproduction (i.e., fitness). Routine predator-prey interactions elicit mutual adaptations that improve predator offenses, such as claws, teeth, and speed, as well as prey defenses, including crypsis, aposematism, and mimicry. Thus, predator-prey interactions resemble an evolutionary arms race.
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Population Growth00:57

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Population size is dynamic, increasing with birth rates and immigration, and decreasing with death rates and emigration. In ideal conditions with unlimited resources, populations can increase exponentially, which plots as a J-shaped growth rate curve of population size against time. This type of curve is characteristic of newly-introduced invasive species, or populations that have suffered catastrophic declines and are rebounding.
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Ecological Niches02:02

Ecological Niches

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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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Symbiosis00:58

Symbiosis

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Symbiotic relationships are long-term, close interactions between individuals of different species that affect the distribution and abundance of those species. When a relationship is beneficial to both species, this is called mutualism. When the relationship is beneficial to one species but neither beneficial nor harmful to the other species, this is called commensalism. When one organism is harmed to benefit another, the relationship is known as parasitism. These types of relationships often...
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Conservation of Small Populations02:04

Conservation of Small Populations

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Small population sizes put a species at extreme risk of extinction due to a lack of variation, and a consequent decrease in adaptability. This weakens the chances of survival under pressures such as climate change, competition from other species, or new diseases. Large populations are more likely to survive pressures such as these, as such populations are more likely to harbor individuals that have genetic variants that are adaptive under new stresses. Small populations are much less...
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Monitoring Intraspecies Competition in a Bacterial Cell Population by Cocultivation of Fluorescently Labelled Strains
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Competition and coexistence in a small carnivore guild.

Jacques de Satgé1, Kristine Teichman2,3, Bogdan Cristescu3,4

  • 1Department of Biology, University of Antwerp, Antwerp, Belgium. jdesatge@gmail.com.

Oecologia
|July 23, 2017
PubMed
Summary

Small African carnivores minimize competition by dividing habitats and activity times. Nocturnal species like the African wildcat and diurnal species like mongooses use different times, while also avoiding each other in space.

Keywords:
Biodiversity hotspotDiel cycleSpatial partitioningSucculent KarooTemporal partitioning

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Area of Science:

  • Ecology and Evolutionary Biology
  • Behavioral Ecology
  • Conservation Biology

Background:

  • Intraspecific competition is a significant driver of coexistence strategies in sympatric species.
  • Small carnivores face intense competition, necessitating niche partitioning to reduce ecological overlap.
  • Understanding spatio-temporal partitioning is crucial for predicting community dynamics and conservation efforts.

Purpose of the Study:

  • To investigate spatial and temporal partitioning patterns among a guild of small African carnivores.
  • To quantify co-occurrence and identify niche separation strategies in a competitive environment.
  • To test the hypothesis of dominant competitor avoidance influencing community structure.

Main Methods:

  • Utilized camera trap data collected over a one-year period to monitor small carnivore activity.
  • Analyzed spatial and temporal co-occurrence data for African wildcats, grey mongooses, small-spotted genets, striped polecats, and yellow mongooses.
  • Employed statistical methods to assess deviations from random co-occurrence patterns.

Main Results:

  • Carnivores segregated into distinct temporal activity groups: nocturnal (wildcat, genet, polecat) and diurnal (mongooses).
  • Significant spatial partitioning was observed within temporal groups, reducing direct overlap.
  • Smaller carnivore species exhibited reduced co-occurrence with the larger African wildcat, supporting dominant competitor avoidance.

Conclusions:

  • Small African carnivores effectively minimize competitive interactions through integrated spatio-temporal habitat partitioning.
  • Niche differentiation, particularly along temporal and spatial axes, facilitates coexistence in this guild.
  • The findings highlight the importance of behavioral plasticity in mediating interspecific competition and community structure.