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All radioactive nuclides emit high-energy particles or electromagnetic waves. When this radiation encounters living cells, it can cause heating, break chemical bonds, or ionize molecules. The most serious biological damage results when these radioactive emissions fragment or ionize molecules. For example, α and β particles emitted from nuclear decay reactions possess much higher energies than ordinary chemical bond energies. When these particles strike and penetrate matter, they...
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Construction of a Compact Low-Cost Radiation Shield for Air-Temperature Sensors in Ecological Field Studies
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Temperature drives diversification in a model adaptive radiation.

Quan-Guo Zhang1, Han-Shu Lu2, Angus Buckling3

  • 1State Key Laboratory of Earth Surface Processes and Resource Ecology and MOE Key Laboratory for Biodiversity Science and Ecological Engineering, College of Life Sciences, Beijing Normal University, Beijing 100875, People's Republic of China zhangqg@bnu.edu.cn.

Proceedings. Biological Sciences
|September 7, 2018
PubMed
Summary
This summary is machine-generated.

Higher temperatures accelerate bacterial evolution and diversification by increasing genetic variation and diversifying selection. Low temperatures limit diversity generation, while warmer environments promote species coexistence and adaptation.

Keywords:
diversifying selectionevolutionary speedexperimental evolutionlatitudinal diversity gradientmutation rateniche differentiation

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Area of Science:

  • Evolutionary Biology
  • Microbial Ecology
  • Temperature Effects on Biodiversity

Background:

  • Global biodiversity patterns show higher species richness in warmer regions.
  • Traditionally, temperature's role in biodiversity is linked to energy availability and habitat area.
  • Temperature may also directly influence the evolutionary processes driving diversity.

Purpose of the Study:

  • To experimentally investigate the direct impact of temperature on the evolution of diversity.
  • To explore how temperature gradients affect speciation and coexistence in a model system.

Main Methods:

  • Utilized a model adaptive radiation system using the bacterium *Pseudomonas fluorescens*.
  • Exposed populations to a controlled temperature gradient to observe evolutionary responses.
  • Assessed the generation of genetic variation, strength of diversifying selection, and population dynamics.

Main Results:

  • Diversification rates significantly increased at higher temperatures.
  • Warmer temperatures enhanced both the supply of genetic variation (mutation rate, population size) and the strength of diversifying selection.
  • Immigration of genetic variation boosted diversity at low temperatures but not at high temperatures, indicating temperature-dependent limitations on endogenous diversity generation.

Conclusions:

  • Temperature acts as a direct driver of evolutionary diversification.
  • Higher temperatures promote diversity through accelerated mutation supply and stronger diversifying selection, leading to enhanced coexistence.
  • Findings suggest that temperature's influence on evolutionary rates is a key factor in shaping biodiversity patterns.