Cold climate adaptation is a plausible cause for evolution of multicellular sporulation in Dictyostelia

Hajara M. Lawal, Christina Schilde, Koryu Kin, Matthew W. Brown, John James, Alan R. Prescott, Pauline Schaap (Lead / Corresponding author)

Research output: Contribution to journalArticle

18 Downloads (Pure)

Abstract

Unicellular protozoa that encyst individually upon starvation evolved at least eight times into organisms that instead form multicellular fruiting bodies with spores. The Dictyostelia are the largest and most complex group of such organisms. They can be subdivided into 4 major groups, with many species in groups 1-3 having additionally retained encystment. To understand fitness differences between spores and cysts, we measured long-term survival of spores and cysts under climate-mimicking conditions, investigated spore and cyst ultrastructure, and related fitness characteristics to species ecology. We found that spores and cysts survived 22 °C equally well, but that spores survived wet and dry frost better than cysts, with group 4 spores being most resilient. Spore walls consist of three layers and those of cysts of maximally two, while spores were also more compacted than cysts, with group 4 spores being the most compacted. Group 4 species were frequently isolated from arctic and alpine zones, which was rarely the case for group 1-3 species. We inferred a fossil-calibrated phylogeny of Dictyostelia, which showed that its two major branches diverged 0.52 billion years ago, following several global glaciations. Our results suggest that Dictyostelium multicellular sporulation was a likely adaptation to a cold climate.

Original languageEnglish
Article number8797
Pages (from-to)1-9
Number of pages9
JournalScientific Reports
Volume10
Issue number1
DOIs
Publication statusPublished - 29 May 2020

Keywords

  • Biological techniques
  • Ecology
  • Evolution

Fingerprint Dive into the research topics of 'Cold climate adaptation is a plausible cause for evolution of multicellular sporulation in Dictyostelia'. Together they form a unique fingerprint.

  • Projects

    Cite this