Independent evolution of shape and motility allows evolutionary flexibility in Firmicutes bacteria

El baidouri, Fouad and Venditti, Chris and Humphries, Stuart (2017) Independent evolution of shape and motility allows evolutionary flexibility in Firmicutes bacteria. Nature Ecology & Evolution, 1 . 0009. ISSN 2397-334X

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Abstract

Functional morphological adaptation is an implicit assumption across many ecological studies. However, despite a few pioneering attempts to link bacterial form and function, functional morphology is largely unstudied in prokaryotes. One intriguing candidate for analysis is bacterial shape, as multiple lines of theory indicate that cell shape and motility should be strongly correlated. Here we present a large-scale use of modern phylogenetic comparative methods to explore this relationship across 325 species of the phylum Firmicutes. In contrast to clear predictions from theory, we show that cell shape and motility are not coupled, and that transitions to and from flagellar motility are common and strongly associated with lifestyle (free-living or host-associated). We find no association between shape and lifestyle, and contrary to recent evidence, no indication that shape is associated with pathogenicity. Our results suggest that the independent evolution of shape and motility in this group might allow a greater evolutionary flexibility.

Keywords:Bacteria, Firmicutes, shape, motility, habitat, evolution, phylogenetic comparative methods, correlation, trait dimensions
Subjects:C Biological Sciences > C180 Ecology
C Biological Sciences > C182 Evolution
C Biological Sciences > C500 Microbiology
Divisions:College of Science > School of Life Sciences
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ID Code:24221
Deposited On:22 Sep 2016 18:06

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