Ecotoxicology

, Volume 22, Issue 10, pp 1461–1466

Endocrine disruption of sexual selection by an estrogenic herbicide in the mealworm beetle (Tenebrio molitor)

  • Malcolm L. McCallum
  • Makensey Matlock
  • Justin Treas
  • Barroq Safi
  • Wendy Sanson
  • Jamie L. McCallum
Article

Abstract

The role that endocrine disruption could play in sexual selection remains relatively untested, and although estrogens occur in insects, little information exists about their biological role in insect reproduction. Atrazine is a commonly applied herbicide that mimics estrogen in vertebrates. Tenebrio molitor were raised from egg to adult under a gradation of environmentally relevant atrazine exposures and a non-treated control. Atrazine was delivered in the drinking water ad libitum. Female T. molitor were provided with a choice between unrelated males raised under three levels of atrazine exposures. Female preference for males demonstrated a non-monotonic inverted U-shaped response to atrazine exposure. There was no significant difference between the control and the high exposure to atrazine. Excluding the control, female preference increased as exposure concentration increased. These results have important repercussions for nonlethal effects of endocrine disruption on populations, their capacity to interfere with sexual selection, and the role of estrogen in pheromone communication among insects.

Keywords

Atrazine Endocrine disruption Sexual selection Estrogen Non-monotonic response 

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • Malcolm L. McCallum
    • 1
  • Makensey Matlock
    • 2
  • Justin Treas
    • 3
  • Barroq Safi
    • 4
  • Wendy Sanson
    • 5
  • Jamie L. McCallum
    • 6
  1. 1.Department of Molecular Biology and BiochemistrySchool of Biological Sciences, University of Missouri-Kansas CityKansas CityUSA
  2. 2.Biology ProgramTexas A&M University-TexarkanaTexarkanaUSA
  3. 3.The Institute of Environmental and Human HealthTexas Tech UniversityLubbockUSA
  4. 4.Department of Biological SciencesTexas State UniversitySan MarcosUSA
  5. 5.Department of Biological SciencesLouisiana State University-Shreveport, One University PlaceShreveportUSA
  6. 6.Department of Biological and Earth SciencesUniversity of Central MissouriWarrensburgUSA

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