Summary: Evolutionary and Ecological Trees and Networks
Emilio Hernandez-Garcfa*, E. Alejandro Herrada*, Alejandro E Rozenfeld^
Claudio J. Tessone*, Victor M. EguiTuz*, Carlos M. Duartef
Arnaud-Haond**·* and Ester Serrao**
*Unidadde Fisica Interdisciplinar-IMEDEA (CSIC-UIB).
Campus Universitat de les Illes Balears, E-07122 Palma de Mallorca, Spain
^Institute* Mediterrdneo de Estudios Avanzados IMEDEA (CSIC-UIB).
C/Miquel Marques, 21, E-07190 Esporles, Mallorca, Spain
**CCMAR, CIMAR-Laboratorio Associado, Universidade do Algarve
Gambelas, 8005-139, Faro, Portugal
^DEEP/LEP-Laboratoire Environnement Profond
IFREMER Centre de Brest, BP 70 29280, Plouzane, France
Abstract. Evolutionary relationships between species are usually represented in phytogenies, i.e. evolutionary trees, which
are a type of networks. The terminal nodes of these trees represent species, which are made of individuals and populations
among which gene flow occurs. This flow can also be represented as a network. In this paper we briefly show some properties
of these complex networks of evolutionary and ecological relationships. First, we characterize large scale evolutionary
relationships in the Tree of Life by a degree distribution. Second, we represent genetic relationships between individuals
of a Mediterranean marine plant, Posidonia oceanica, in terms of a Minimum Spanning Tree. Finally, relationships among
plant shoots inside populations are represented as networks of genetic similarity.