The news reporters obtained a quote from the research from Smithsonian, "The problem is especially overlooked in multi-locus or phylogenomic scale analyses, in part because no efficient tools exist to accommodate base composition heterogeneity in large data sets. We present a detailed analysis of a data set with 20 genes and 214 taxa to study the phylogeny of flatfishes (Pleuronectiformes) and their position among percomorphs. Most genes vary significantly in base composition among taxa and fail to resolve flatfish monophyly and other emblematic groups, suggesting that non-stationarity may be causing systematic error. We show a strong association between base compositional bias and topological discordance among individual gene partitions and their inferred trees. Phylogenetic methods applying non-homogeneous models to accommodate non-stationarity have relatively minor effect to reduce gene tree discordance, suggesting that available computer programs applying these methods do not scale up efficiently to the data set of modest size analysed in this study. By comparing phylogenetic trees obtained with species tree (STAR) and concatenation approaches, we show that gene tree discordance in our data set is most likely due to base compositional biases than to incomplete lineage sorting. Multi-locus analyses suggest that the combined phylogenetic signal from all loci in a concatenated data set overcomes systematic biases induced by non-stationarity at each partition. Finally, relationships among flatfishes and their relatives are discussed in the light of these results."
According to the news reporters, the research concluded: "We find support for the monophyly of flatfishes and confirm findings from previous molecular phylogenetic studies suggesting their close affinity with several carangimorph groups (i.e., jack and allies, barracuda, archerfish, billfish and swordfish, threadfin, moonfish, beach salmon, and snook and barramundi)."
For more information on this research see: Addressing Gene Tree Discordance and Non-Stationarity to Resolve a Multi-Locus Phylogeny of the Flatfishes (Teleostei: Pleuronectiformes). Systematic Biology, 2013;62(5):763-785. Systematic Biology can be contacted at:
Our news correspondents report that additional information may be obtained by contacting
Keywords for this news article include:
Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2013, NewsRx LLC
Most Popular Stories
- Dell Offers Undisclosed Number of Employee Buyouts
- Saab Gets Back into the Game; U.S. Auto Sales Soar
- Authorities Close to Deal with JPMorgan Chase over Madoff Response
- Apple Activates Customer-Tracking iBeacon
- 2013 Tech Gift Guide: iPad Mini Still Hot; Chromecast a Great Low-Cost Option
- A Biography of Jonathan Ive, Apple's Creative Chief
- It's No Yolk: Food-tech Startups Take Aim at Replacing Eggs
- U.S. Stocks Rise on Sysco Acquisition