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Rotifer adaptation to the unpredictability of the growing season

  • Lluis Franch-Gras
  • Eva Tarazona
  • Eduardo M. García-Roger
  • María José Carmona
  • Africa Gómez
  • Manuel SerraEmail author
ROTIFERA XV Review Paper

Abstract

Sexual reproduction in cyclically parthenogenetic rotifers results in the production of diapausing eggs that tolerate harsh conditions. Theory predicts that the adaptation to environmental unpredictability can occur by the evolution of bet-hedging strategies. When facing unpredictability in the length of rotifer growing season, patterns of diapausing egg production and hatching can disperse risks and act as bet-hedging strategies. Here, we identified the methodologies to test bet-hedging theory and summarized predictions on rotifer diapause traits. We assessed these predictions by reviewing and reanalyzing results from other studies on field and experimentally evolving populations of Brachionus plicatilis from Spanish ponds. These studies include (1) a quantification of the unpredictability in field populations, (2) the measurement of diapause-related traits in laboratory conditions, and (3) genomic data. The view arising is that these rotifers adaptively respond to the unpredictability in their localities. As expected, propensity for sex increased with unpredictability. Hatching fractions of diapausing eggs were intermediate and decreased with unpredictability only in experimentally evolving populations. In field populations, genetic variance in the focal traits did not increase with unpredictability. Finally, environmental features and diapause-related traits are associated to suites of specific genes, although the molecular mechanisms linking these genes with life history are still unknown.

Keywords

Bet hedging Cyclical parthenogenesis Dormancy Sexual reproduction Temporary habitats Time-varying environments Propensity for sex Diapausing egg hatching fraction Genomic analysis Local adaptation SNPs 

Notes

Acknowledgements

This study was supported by the Spanish Plan Nacional de Investigación Científica, Desarrollo e Innovación Tecnológica from the Spanish Ministry of Economy and Competitiveness, grant CGL2015-65422-P (co-financed by FEDER funds, European Union). L.F.-G. was supported by a predoctoral contract (PREDOC13-110502) from the Universitat de Valencia and E.T was supported by a predoctoral contract from the Spanish Ministry of Economy and Competitiveness (BES-2013-066448).

Supplementary material

10750_2019_3886_MOESM1_ESM.docx (93 kb)
Supplementary material 1 (DOCX 93 kb)

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© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Cavanilles Institute of Biodiversity and Evolutionary BiologyUniversity of ValenciaValenciaSpain
  2. 2.School of Environmental SciencesUniversity of HullHullUK

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