Evolutionary Networks


Evolutionary networks are labeled and weighted connected graphs that, in contrast to genetic trees, may contain cycles. A network can accommodate ambiguities concerning evolutionary pathways and thus simultaneously represent alternative estimates of a phylogeny.

Keywords: phylogeny; median network; mtDNA; Y chromosome; parsimony

Figure 1.

(a) Binary data table and (b) its corresponding median network. The unbroken links indicate a network (obtained via split decomposition) that realizes the mismatch distances in the five‐dimensional sequence space (hypercube). The bold links constitute the minimum spanning network as well as the MJ network relative to parameter ε = 0. The RM network is formed by the bold and broken links (parameter r = 2).

Figure 2.

(a) Table of deoxyribonucleic acid sequences and (b) its corresponding quasi‐median network. The unbroken links indicate a network that realizes the mismatch distances in the three‐dimensional sequence space (Hamming graph). The bold links constitute the minimum spanning network as well as the median‐joining network (parameter ε = 0).



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Further Reading

Avise JC (2000) Phylogeography: The History and Formation of Species. Cambridge: Harvard University Press.

Page RDM and Holmes EC (1998) Molecular Evolution: A Phylogenetic Approach. Oxford: Blackwell Science.

Wägele J‐W (2001) Grundlagen der phylogenetischen Systematik. Munich: Verlag Dr Friedrich Pfeil.

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How to Cite close
Bandelt, Hans‐Jürgen(Jul 2006) Evolutionary Networks. In: eLS. John Wiley & Sons Ltd, Chichester. http://www.els.net [doi: 10.1038/npg.els.0005463]