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Hydrobiologia

, Volume 593, Issue 1, pp 121–128 | Cite as

Intraclonal variation in propensity for mixis in several rotifers: variation among females and with maternal age

  • John J. Gilbert
  • Thomas Schröder
Advances in Rotifer Research

Abstract

In 14 previously published experiments with clones of three species of Brachionus, Epiphanes ukera, and Rhinoglena frontalis, females cultured singly in small volumes from birth through most of their reproductive period usually produced some mictic daughters. Here, these data are analyzed to test two hypotheses: the propensity of females in a clone to produce mictic daughters will vary significantly among females, and will decrease with female age. Significant heterogeneity (χ2) among replicate females was demonstrated in two clones of B. calyciflorus from Florida, in single clones of this species from Georgia, Texas, Spain, and Australia, in a clone of B. angularis from Argentina, and in single clones of E. ukera and R. frontalis from Germany. No significant heterogeneity was found in two other clones of B. calyciflorus from Florida and in a clone of B. variabilis from Spain. Significant heterogeneity among females of a clone could be caused by chance fluctuations during development, differences in birth order, or epimutations. This heterogeneity is an important component of a bet-hedging strategy to balance production of diapausing fertilized eggs and future population growth by female parthenogenesis. The propensity of a female to produce mictic daughters did not decrease with her age. In experiments with six different clones from four strains of B. calyciflorus, and with single clones of E. ukera and R. frontalis, only one clone of B. calyciflorus showed significant variation (ANOVA) in the proportion of mictic daughters produced in three or four successive one- or two-day periods. In this clone the proportion of mictic daughters increased with maternal age.

Keywords

Bet-hedging Maternal-age effects Sexual reproduction 

Notes

Acknowledgments

We are grateful to Claus-Peter Stelzer and two anonymous referees for helpful comments on the manuscript.

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Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  1. 1.Department of Biological SciencesDartmouth CollegeHanoverUSA
  2. 2.Department of Biological SciencesUniversity of Texas at El PasoEl PasoUSA

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