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Related Concept Videos

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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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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What is a Species?01:17

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Overview
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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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Competition02:34

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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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Experimental Protocol for Manipulating Plant-induced Soil Heterogeneity
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How context dependent are species interactions?

Scott A Chamberlain1, Judith L Bronstein, Jennifer A Rudgers

  • 1Department of Ecology and Evolutionary Biology, Rice University, Houston, TX, USA.

Ecology Letters
|April 17, 2014
PubMed
Summary
This summary is machine-generated.

Species interaction outcomes like competition and mutualism vary greatly depending on the environment. Context dependency, or how these interactions change, is most influenced by spatial and abiotic factors, not just other species.

Keywords:
Coefficient of variationcommunity contextconditionalitydistributed outcomesinteraction strengthmeta-analysis

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Environmental Science

Background:

  • Interspecific species interactions significantly impact individuals and populations, with effects varying in strength and direction.
  • Interaction outcomes are often context-dependent, meaning they change based on biotic or abiotic factors.
  • The prevalence and patterns of context dependency in natural systems remain incompletely understood.

Purpose of the Study:

  • To quantitatively assess the variation in species interaction outcomes (competition, mutualism, predation) using meta-analysis.
  • To investigate how context dependency manifests across different types of species interactions.
  • To identify the key contextual factors driving variations in interaction outcomes.

Main Methods:

  • Conducted a meta-analysis of 247 published studies on species interactions.
  • Quantified the variation in the sign (positive, negative, neutral) and magnitude of effect sizes.
  • Analyzed how context dependency differs across interaction types and contextual factors (e.g., spatial gradients, abiotic factors, presence of other species, study location, ecosystem type).

Main Results:

  • Variation in the magnitude of effect sizes did not significantly differ among competition, mutualism, and predation.
  • Mutualism showed the highest likelihood of sign change across contexts, while predation showed the least.
  • Spatial and abiotic gradients were stronger drivers of context dependency than the presence of a third species.
  • Laboratory studies exhibited greater variation in outcomes compared to field studies.
  • The degree of context dependency varied inconsistently across interaction types and study settings.

Conclusions:

  • Context dependency is a crucial aspect of species interactions, influencing their outcomes significantly.
  • Understanding context dependency requires focusing on the patterns of variation rather than just average effects.
  • Future research should prioritize investigating the drivers and variability of context dependency across diverse ecological settings.