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Author Spotlight: Advancements in X-ray CT Tool Chain for Tree Core Analysis
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Frequency-dependent tree growth depends on climate.

Jeffrey M Diez1, Rohan Boone1,2, Teresa Bohner1

  • 1Department of Botany and Plant Sciences, University of California, Riverside, California, 92501, USA.

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Summary
This summary is machine-generated.

Climate influences how sugar pine (Pinus lambertiana) growth changes when rare or common. Stabilizing niche differences occur in dry years, but positive frequency dependence in wet years impacts coexistence.

Keywords:
competitionfrequency dependencenichepriority effectsspecies interactionstree demography

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Area of Science:

  • Ecology
  • Climate Change Biology
  • Forest Ecology

Background:

  • Species performance, distribution, and coexistence are shaped by climate and competition.
  • Understanding how climate modulates frequency-dependent performance is crucial for predicting species interactions and coexistence.
  • Negative frequency dependence promotes coexistence, while positive frequency dependence can lead to priority effects.

Purpose of the Study:

  • To investigate whether the frequency-dependent growth of sugar pine (Pinus lambertiana) is influenced by climatic conditions.
  • To determine how precipitation levels interact with frequency dependence to affect sugar pine growth and competition.

Main Methods:

  • Utilized dendrochronology to analyze tree growth rings.
  • Employed hierarchical models to assess growth rates in relation to precipitation and species frequency.
  • Examined both intraspecific (conspecific) and interspecific (heterospecific) competition dynamics.

Main Results:

  • Sugar pine growth rates were significantly dependent on annual precipitation.
  • No overall frequency dependence was observed across all years.
  • A significant interaction between precipitation and frequency dependence was detected, showing stabilizing effects in dry years and positive frequency dependence in wet years.

Conclusions:

  • Climate variation, specifically precipitation, dynamically alters the balance between stabilizing and destabilizing species interactions.
  • Precipitation-driven changes in competition intensity and direction mediate frequency-dependent effects on sugar pine growth.
  • These findings highlight the complex interplay between climate and frequency dependence in shaping long-lived species dynamics and coexistence.