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Evolutionary Ecology

, Volume 30, Issue 2, pp 251–265 | Cite as

Effects of parental care on the accumulation and release of cryptic genetic variation: review of mechanisms and a case study of dung beetles

  • Emilie C. Snell-RoodEmail author
  • Melissa Burger
  • Quinton Hutton
  • Armin P. Moczek
Original Paper

Abstract

Cryptic genetic variation plays an important role in the emergence of disease and evolutionary responses to environmental change. Focusing on parental care behavior, we discuss three mechanisms by which behavior can affect the accumulation and release of cryptic genetic variation. We illustrate how these hypotheses might be tested with preliminary data from Onthophagus dung beetles, which provide indirect parental care by provisioning their offspring with dung and sheltering them underground. The environmental stress hypothesis states that parental care reduces selection intensity on novel mutations when increased parental care results in a less stressful offspring environment. A review of recent literature, coupled with an irradiation experiment in beetles, suggests this mechanism may operate in some situations, but depends on the types of mutations under consideration. The relaxed selection hypothesis states that genes expressed in low care environments should be under weakened selection because their phenotypic manifestations are exposed to selection less frequently, and thus are prone to mutation accumulation. If parental care is reduced, for instance due to population-wide environmental changes, such cryptic variation may exert phenotypic effects, becoming exposed to selection. There is substantial theory in support of this hypothesis, and comparisons between beetle populations that differ in parental care behavior further support this idea. Finally, the compensation hypothesis states that organisms with direct parental care may be able to respond to cues or signals from offspring and compensate for genetic variants. We highlight the extensive discussion of this hypothesis with respect to medical care and genetic load in humans and explore invertebrate systems that may constitute powerful models for further inquiry. In summary, several mechanisms exist by which care behavior may shape the accumulation and release of cryptic genetic variation, thereby affecting the potential emergence of diseases and the rate and direction of evolutionary responses to novel environments.

Keywords

Cryptic genetic variation Parental care Life history Niche construction Buffering 

Notes

Acknowledgments

We are grateful to Thom Kaufman and Kevin Cook, who provided advice on mutagenesis and arranged irradiation treatments. Joanna Masel and Etienne Rajon provided thoughtful discussion and insights. Ruth Shaw offered important analysis advice, especially with respect to quantitative genetics analysis. Wendy Anderson and Erin Yoder helped with aspects of beetle care. This manuscript was substantially improved based on comments from two anonymous reviewers. ESR was supported during part of this project by an NIH NRSA F32GM083830 investigating the importance of relaxed selection on development. Additional support was provided by National Science Foundation grant IOS 0820411 and IOS 0718522 to APM. The content of this paper does not necessarily represent the official views of the National Institutes of Health or the National Science Foundation.

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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  • Emilie C. Snell-Rood
    • 1
    • 2
    Email author
  • Melissa Burger
    • 2
    • 3
  • Quinton Hutton
    • 2
  • Armin P. Moczek
    • 2
  1. 1.Department Ecology, Evolution and BehaviorUniversity of MinnesotaSt PaulUSA
  2. 2.Department BiologyIndiana UniversityBloomingtonUSA
  3. 3.Department of Natural Resources ScienceUniversity of Rhode IslandKingstonUSA

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