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Related Concept Videos

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...
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Understanding the evolutionary relationships among microorganisms is fundamental to microbial ecology and taxonomy. Phylogenetic trees are essential tools for inferring these relationships, relying primarily on comparative analyses of molecular sequences such as DNA, RNA, or proteins. In microbial studies, these trees typically depict the evolutionary paths of diverse bacterial and archaeal species by mapping genetic differences accumulated over time.Phylogenetic trees are composed of tips,...
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The phylogenetic species concept (PSC) is a framework used to delineate species based on evolutionary relationships, emphasizing shared ancestry and diagnosable genetic traits. Unlike morphological or biological species concepts, the PSC is particularly advantageous for microbial taxonomy, where traditional reproductive or phenotypic criteria often fall short due to the prevalence of asexual reproduction, minimal morphological differentiation, and widespread horizontal gene transfer among...
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A Concoction Pipeline for Generating Molecular Operational Taxonomic Units (MOTUs) Among Riparian and Aquatic Beetles
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Separating the determinants of phylogenetic community structure.

Matthew R Helmus1, Kristina Savage, Matthew W Diebel

  • 1Department of Zoology, University of Wisconsin, Madison, WI 53706, USA. mrhelmus@wisc.edu

Ecology Letters
|September 12, 2007
PubMed
Summary

Competition may prevent similar species from living together, but environmental factors can attract them. This study found that closely related sunfishes are less likely to co-occur after accounting for environmental influences.

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Community Ecology

Background:

  • Competition's role in limiting species co-occurrence is debated.
  • Similar species often share environmental needs, leading to apparent attraction.
  • Phylogenetic relatedness offers an objective measure of species similarity.

Purpose of the Study:

  • To disentangle attraction and repulsion patterns in species co-occurrence.
  • To investigate the influence of environmental filtering versus competition on community structure.
  • To examine phylogenetic structure in sunfish (Centrarchidae) communities.

Main Methods:

  • Studied 11 sunfish species across 890 lakes.
  • Analyzed raw community data for phylogenetic patterns.
  • Regressed species presence/absence against environmental variables (water clarity, latitude).
  • Statistically removed environmental effects to reveal underlying phylogenetic structure.

Main Results:

  • No initial phylogenetic pattern observed in raw community data.
  • Environmental variables (water clarity, latitude) correlated with the presence of closely related species.
  • Phylogenetic repulsion was evident after controlling for environmental factors, indicating related species avoid co-occurrence.

Conclusions:

  • Both environmental filtering (leading to phylogenetic attraction) and competition (leading to phylogenetic repulsion) operate simultaneously.
  • These opposing forces obscure each other in overall community phylogenetic structure.
  • Phylogenetic repulsion suggests competition plays a significant role in structuring sunfish communities.