Male mating signals, including ornaments and courtship displays, and other sexually selected traits, like male-male aggression, are largely controlled by sex hormones. Environmental pollutants, notably endocrine disrupting compounds, can interfere with the proper functioning of hormones, thereby impacting the expression of hormonally regulated traits. Atrazine, one of the most widely used herbicides, can alter sex hormone levels in exposed animals.
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Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/environmentally-realistic-exposure-herbicide-atrazine-alters-some-sexually-selected
[2] http://admin.indiaenvironmentportal.org.in/category/author/kausalya-shenoy
[3] http://admin.indiaenvironmentportal.org.in/category/journal/plos-one
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pesticides-and-toxins
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/herbicide
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/toxicity-studies
