When Unreliable Cues Are Good Enough

@article{DonaldsonMatasci2013WhenUC,
  title={When Unreliable Cues Are Good Enough},
  author={Matina C. Donaldson-Matasci and Carl T. Bergstrom and Michael Lachmann},
  journal={The American Naturalist},
  year={2013},
  volume={182},
  pages={313 - 327}
}
In many species, nongenetic phenotypic variation helps mitigate risk associated with an uncertain environment. In some cases, developmental cues can be used to match phenotype to environment—a strategy known as predictive plasticity. When environmental conditions are entirely unpredictable, generating random phenotypic diversity may improve the long-term success of a lineage—a strategy known as diversified bet hedging. When partially reliable information is available, a well-adapted… 

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References

SHOWING 1-10 OF 55 REFERENCES

Phenotypic diversity as an adaptation to environmental uncertainty

A graphical heuristic for determining the optimal amount of diversity in a fluctuating environment is developed, and it is confirmed that bet-hedging should be observed only within a certain range of environmental variation.

Adaptation in a Changing Environment : Phenotypic Diversity in Response to Environmental Uncertainty and Information

This dissertation model the evolution of plasticity in three contexts shows how the optimal amount of diversity produced depends on the amount of uncertainty in the environment and how individuals can sometimes use cues gathered during development to help predict the future environment, and better direct their developmental trajectory.

The Evolutionary Maintenance of Alternative Phenotypes

  • N. Moran
  • Biology, Psychology
    The American Naturalist
  • 1992
Polyphenism may be restricted to circumstances in which the developmental switch occurs during very early development, and the abundance of seasonal polyphenisms in multivoltine organisms suggests that where environments are favorable, developmental systems are often flexible enough for the establishment of simple polyphenism.

Fluctuating natural selection accounts for the evolution of diversification bet hedging

  • A. Simons
  • Environmental Science, Biology
    Proceedings of the Royal Society B: Biological Sciences
  • 2009
The observed magnitude of fluctuating selection is sufficient to account for the degree of diversification behaviour characteristic of individuals of this species and a quantitative test of optimality of a bet-hedging trait in nature is provided.

Evolution in a Variable Environment

A general model for the effects of variation in reproductive success on gene-frequency change and phenotypic evolution is developed and applied to patterns of developmental homeostasis, the evolution of iteroparity, and the effect of variability in resource acquisition under nonlinear gains.

Bet hedging in a guild of desert annuals.

This paper reports an association between delayed germination (a bet hedging trait) and risk using a 22-year data set on demographic variation for 10 species of desert annual plants and shows that the species with greater long-term demographic variation tended to be the ones with greater sensitivity of reproductive success to variation among years in growing-season precipitation.

ENVIRONMENTAL AND GENETIC SOURCES OF DIVERSIFICATION IN THE TIMING OF SEED GERMINATION: IMPLICATIONS FOR THE EVOLUTION OF BET HEDGING

  • A. SimonsM. Johnston
  • Environmental Science
    Evolution; international journal of organic evolution
  • 2006
Analysis of sources of variation in timing of germination within seasons, germination fraction over two generations and three sequential seasons, and the genetic correlation structure of these traits using almost 10,000 seeds from more than 100 genotypes of the monocarpic perennial Lobelia inflata suggests that extreme sensitivity to environmental gradients, or microplasticity, may act as an effective individual-level diversification mechanism and explains more than 30% of variance in time to germination.

Stochastic switching as a survival strategy in fluctuating environments

It is found that fast-sw switching populations outgrow slow switchers when the environment fluctuates rapidly, whereas slow-switching phenotypes outgrow fast switcher when the environments changes rarely.

Plastic bet-hedging in an amphicarpic annual: an integrated strategy under variable conditions

Evidence is found for an adaptive integrated strategy, with bet-hedging “fine-tuned” by phenotypic plasticity as a function of environmental conditions in E. spinosa, a semi-arid, amphicarpic annual, inhabiting habitats with different levels of environmental variation.
...