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Frequency-dependent Selection

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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Published on: March 13, 2014

Conspecific negative density dependence and forest diversity.

Daniel J Johnson1, Wesley T Beaulieu, James D Bever

  • 1Department of Biology, Indiana University, Bloomington, IN 47405, USA. dj4@indiana.edu

Science (New York, N.Y.)
|May 19, 2012
PubMed
Summary
This summary is machine-generated.

Conspecific negative density dependence (CNDD) is a widespread process that shapes plant community diversity. Abundant species show weaker CNDD, while species-rich areas exhibit stronger CNDD, influencing forest ecosystems.

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Area of Science:

  • Ecology
  • Forestry
  • Plant Community Dynamics

Background:

  • Conspecific negative density dependence (CNDD) is a process where local abundance negatively impacts seedling establishment via host-specific enemies.
  • The broad applicability of CNDD in structuring plant communities remains incompletely understood.
  • Understanding CNDD is crucial for predicting plant community responses to environmental changes.

Purpose of the Study:

  • To investigate the prevalence and strength of CNDD across diverse forest ecosystems.
  • To determine how species abundance and regional species richness influence CNDD.
  • To assess the role of heterospecific density on seedling establishment.

Main Methods:

  • Utilized the U.S. Forest Service's Forest Inventory and Analysis database, encompassing over 200,000 forest plots.
  • Analyzed data from 151 plant species across 4,000,000 square kilometers, from boreal to subtropical forests.
  • Quantified CNDD by relating local conspecific abundance to seedling establishment rates.

Main Results:

  • The majority of species exhibited CNDD, indicating its widespread occurrence.
  • The effect of heterospecific density on establishment was minimal.
  • Abundant species demonstrated weaker CNDD compared to rarer species.
  • Regions with higher species richness displayed stronger CNDD.

Conclusions:

  • CNDD is a pervasive ecological mechanism significantly influencing plant species diversity across extensive forest gradients.
  • The strength of CNDD is modulated by species abundance and regional species richness.
  • Findings highlight CNDD as a key factor in maintaining forest biodiversity.