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Related Concept Videos

Evolutionary Processes in Microbes01:26

Evolutionary Processes in Microbes

Microbial evolution occurs rapidly due to short generation times and a variety of genetic processes, including horizontal gene transfer, mutation, recombination, and genetic drift. These mechanisms collectively enable microbes to adapt swiftly to changing environments.Horizontal gene transfer (HGT) allows genes to move between different species and occurs through three main mechanisms: conjugation, transformation, and transduction. Conjugation involves direct cell-to-cell contact for DNA...
Evolutionary Relationships through Genome Comparisons02:54

Evolutionary Relationships through Genome Comparisons

Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
The Evidence for Evolution02:55

The Evidence for Evolution

Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.The collection of fossils within sedimentary rocks give a record of common ancestry and often depicts the history of evolution.
Speciation Rates01:07

Speciation Rates

Speciation can proceed at markedly different rates, and evolutionary biologists commonly describe these differences through the models of gradualism and punctuated equilibrium. Both patterns explain how new species arise, but they differ in the tempo and continuity of evolutionary change. In both cases, evolutionary change arises from heritable variation within populations, with natural selection often shaping traits that improve survival and reproduction under specific environmental conditions.
Evolution of New Traits in Microbes01:24

Evolution of New Traits in Microbes

Microorganisms evolve rapidly due to their large population sizes and short generation times, often exhibiting measurable changes within days under laboratory conditions. Natural selection acts on standing genetic variation, enabling the retention and amplification of beneficial traits that confer fitness advantages in changing environments.Adaptive Pigment Regulation in RhodobacterIn Rhodobacter, a genus of purple non-sulfur bacteria, light-harvesting pigments such as bacteriochlorophyll and...
Gene Evolution - Fast or Slow?02:05

Gene Evolution - Fast or Slow?

The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
In contrast, regions which code...

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Creating Objects and Object Categories for Studying Perception and Perceptual Learning
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Published on: November 2, 2012

An evolutionary process that assembles phenotypes through space rather than through time.

Richard Shine1, Gregory P Brown, Benjamin L Phillips

  • 1School of Biological Sciences A08, University of Sydney, Sydney, NSW 2006, Australia. rick.shine@sydney.edu.au

Proceedings of the National Academy of Sciences of the United States of America
|March 26, 2011
PubMed
Summary

Spatial sorting, an evolutionary mechanism driven by differential dispersal, can lead to rapid trait evolution at range edges. This process favors dispersal traits, irrespective of their impact on survival or reproduction, offering a new perspective on evolutionary theory.

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Area of Science:

  • Evolutionary biology
  • Ecology
  • Genetics

Background:

  • Classical evolutionary theory posits that traits evolve due to their impact on survival and reproduction.
  • Differential dispersal is an underappreciated evolutionary mechanism.
  • Range expansion and invasion dynamics are key ecological processes.

Purpose of the Study:

  • To introduce and discuss the evolutionary mechanism of spatial sorting.
  • To highlight the implications of spatial sorting for evolutionary theory.
  • To propose spatial sorting as an alternative or complementary mechanism to natural selection in explaining certain evolutionary phenomena.

Main Methods:

  • Conceptual discussion of evolutionary mechanisms.
  • Analysis of trait accumulation at expanding range edges.
  • Examination of assortative mating among dispersing individuals.

Main Results:

  • Traits enhancing dispersal accumulate at invasion fronts.
  • Assortative mating among fast dispersers drives an evolutionary increase in dispersal rates.
  • Spatial sorting generates novel phenotypes optimized for rapid dispersal, independent of survival or reproductive benefits.

Conclusions:

  • Spatial sorting is a significant evolutionary mechanism that has been overlooked.
  • This mechanism can explain phenomena like accelerated invasion fronts and insular flightlessness.
  • Further research into spatial sorting is warranted to understand its full evolutionary impact.