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Related Concept Videos

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Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.The structures that arise from convergent evolution are called analogous structures. They are similar in function even if they are dissimilar in structure. Further, structures can be analogous while also...
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Generation of Chimeric Axolotls with Mutant Haploid Limbs Through Embryonic Grafting
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Data congruence, paedomorphosis and salamanders.

Torsten H Struck1

  • 1Department of Biology/Chemistry, University of Osnabrück, Barbarastr, 11, Osnabrück, D-49076, Germany. struck@biologie.uni-osnabrueck.de.

Frontiers in Zoology
|November 2, 2007
PubMed
Summary
This summary is machine-generated.

Paedomorphosis can distort evolutionary trees, but specific strategies effectively minimize these conflicts in phylogenetic analyses. Excluding paedomorphic traits and using methods like NDI and PABA improve accuracy.

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Area of Science:

  • Evolutionary Biology
  • Phylogenetics
  • Molecular Evolution

Background:

  • Paedomorphosis, the retention of juvenile traits in adults, can complicate phylogenetic analyses.
  • Distinguishing primary absence from secondary loss of traits is challenging, potentially misleading analyses.
  • Incongruence between morphological and molecular data necessitates methods to assess phylogenetic reliability.

Purpose of the Study:

  • To assess incongruence between morphological and molecular data in salamander phylogeny.
  • To test strategies for mitigating the effects of paedomorphosis on phylogenetic studies.
  • To evaluate the efficiency of different methods for detecting data incongruence.

Main Methods:

  • Compiled previously published morphological and molecular data sets for salamanders.
  • Applied five methods (PABA, PBS, NDI, LILD, DRI) to detect data incongruence.
  • Tested two strategies to ameliorate the impact of paedomorphosis, including excluding paedomorphic traits.

Main Results:

  • Combining morphological and molecular data revealed incongruence and altered positions for paedomorphic taxa.
  • Strategies to ameliorate paedomorphosis, particularly excluding paedomorphic traits, minimized conflicts.
  • The RAG1 molecular partition was most effective for deep salamander phylogeny; NDI and PABA were conservative in detecting incongruence.

Conclusions:

  • Paedomorphosis significantly conflicts with and can mislead phylogenetic analyses, even when combining data types.
  • Specific strategies effectively minimize paedomorphosis-induced problems in phylogenetic reconstruction.
  • NDI and PABA are recommended for detecting incongruence due to their conservative nature and computational efficiency.