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Although the speciation models and speciation rates in eukaryotes have traditionally been established by analyzing the fossil record data, this is frequently incomplete, and not always available.
More recently, several methods based on molecular sequence data have been developed to estimate speciation and extinction rates from phylogenies reconstructed from contemporary taxa.
The units of branch length are usually nucleotide substitutions per site, that is, the number of changes or ‘substitutions’ divided by the length of the sequence. Direct evidence of recombination in the rec A of Aeromonas bestiarum.
The branch lengths (not the nodes) in some trees (dated trees) may be interpreted as time estimates.
From the chronograms obtained, we carried out a diversification analysis using several approaches. No use, distribution or reproduction is permitted which does not comply with these terms.This implies that although it is possible to infer phylogenies from molecular sequences, it is not possible to estimate molecular rates or divergence times, because the individual contribution of each one to molecular evolution cannot be separated (Felsenstein, 1981; Drummond et al., 2006; Lepage et al., 2007). Sobria, are opportunistic pathogens of humans, in which they produce diseases with a broad severity spectrum, ranging from mild diarrhea to life-threatening infections (Janda and Abbott, 2010; Parker and Shaw, 2011). Among the challenges associated with the study of macroevolutionary patterns in microorganisms, one of the most significant is to determine if the diversification rate is constant or varies over time. Hence, the Aeromonas genus constitutes a perfect scenario to study the diversification processes in bacteria due to the huge variety of habitats from which its species can be isolated and its combination of free-living bacteria and host-associated strains. doi: 10.1126/science.1144876 Pub Med Abstract | Cross Ref Full Text | Google Scholar Roger, F., Marchandin, H., Jumas-Bilak, E., Kodjo, A., Bvh, C., and Lamy, B. Multilocus genetics to reconstruct aeromonad evolution. All these methods have potential applications in the study of speciation and extinction processes in organisms with few or non-existent fossil records, such as prokaryotes, although a major problem is the difficulty in estimating divergence times. Phylogenetic trees derived from DNA sequences only contain information about the relative timing of reconstructed speciation events.