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Evolutionary Dynamics of Chloroplast Genomes in Low Light: A Case Study of the Endolithic Green Alga Ostreobium quekettii 5
Marcelino, Vanessa R.; Cremen, Ma Chiela M.; Jackson, Chistopher J.; Larkum, Anthony A. W.; Verbruggen, Heroen.
Some photosynthetic organisms live in extremely low light environments. Light limitation is associated with selective forces as well as reduced exposure to mutagens, and over evolutionary timescales it can leave a footprint on species' genomes. Here, we present the chloroplast genomes of four green algae (Bryopsidales, Ulvophyceae), including the endolithic (limestone-boring) alga Ostreobium quekettii, which is a low light specialist. We use phylogenetic models and comparative genomic tools to investigate whether the chloroplast genome of Ostreobium corresponds to our expectations of how low light would affect genome evolution. Ostreobium has the smallest and most gene-dense chloroplast genome among Ulvophyceae reported to date, matching our expectation...
Tipo: Text Palavras-chave: Genome streamlining; Photosynthesis; Rates of evolution; Boring algae; Stoichiogenomics.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00659/77094/78418.pdf
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Preservation biases, rates of evolution and coherence of databases: Bivalvia as a study case 41
Ros,Sonia; de Renzi,Miquel.
Several hypotheses about the influence of preservation on Bivalvia rates of evolution estimates (marine and freshwater families) were tested in a previous paper. However, the database used for those tests had a patchy quality and our results were provisional. Now an improved database dealing with only marine families has been used in order to test again those hypotheses. We removed freshwater families from the early database and we test the statistical hypotheses on these two data sources. Diversification patterns remain stable in general with these different databases; however, only the improved database shows the mass extinction at the end of the Triassic times. Statistical conclusions in the previous paper are generally confirmed in the present study....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Databases; Fossil record; Preservation biases; Bivalves; Rates of evolution.
Ano: 2005 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142005000300003
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