Evolution of life cycles and reproductive traits: Insights from the brown algae.

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State: Public
Version: Final published version
License: CC BY 4.0
Serval ID
serval:BIB_9FC279E4C2BC
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Evolution of life cycles and reproductive traits: Insights from the brown algae.
Journal
Journal of evolutionary biology
Author(s)
Heesch S., Serrano-Serrano M., Barrera-Redondo J., Luthringer R., Peters A.F., Destombe C., Cock J.M., Valero M., Roze D., Salamin N., Coelho S.M.
ISSN
1420-9101 (Electronic)
ISSN-L
1010-061X
Publication state
Published
Issued date
07/2021
Peer-reviewed
Oui
Volume
34
Number
7
Pages
992-1009
Language
english
Notes
Publication types: Journal Article
Publication Status: ppublish
Abstract
A vast diversity of types of life cycles exists in nature, and several theories have been advanced to explain how this diversity has evolved and how each type of life cycle is retained over evolutionary time. Here, we exploited the diversity of life cycles and reproductive traits of the brown algae (Phaeophyceae) to test several hypotheses on the evolution of life cycles. We investigated the evolutionary dynamics of four life-history traits: life cycle, sexual system, level of gamete dimorphism and gamete parthenogenetic capacity. We assigned states to up to 77 representative species of the taxonomic diversity of the brown algal group, in a multi-gene phylogeny. We used maximum likelihood and Bayesian analyses of correlated evolution, while taking the phylogeny into account, to test for correlations between traits and to investigate the chronological sequence of trait acquisition. Our analyses are consistent with the prediction that diploid growth evolves when sexual reproduction is preferred over asexual reproduction, possibly because it allows the complementation of deleterious mutations. We also found that haploid sex determination is ancestral in relation to diploid sex determination. However, our results could not address whether increased zygotic and diploid growth are associated with increased sexual dimorphism. Our analyses suggest that in the brown algae, isogamous species evolved from anisogamous ancestors, contrary to the commonly reported pattern where evolution proceeds from isogamy to anisogamy.
Keywords
Phaeophyceae, gamete size, parthenogenesis, ploidy, sex determination
Pubmed
Web of science
Open Access
Yes
Create date
30/07/2021 11:10
Last modification date
03/08/2021 6:37
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