Biology: The Unity and Diversity of Life (MindTap Course List)
Biology: The Unity and Diversity of Life (MindTap Course List)
14th Edition
ISBN: 9781305073951
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Chapter 34, Problem 4DAA

Sperm Counts Down on the Farm Contamination of water by agricultural chemicals affects reproductive function in some animals. Are there effects on humans? Epidemiologist Shanna Swan and her colleagues studied sperm from men in four cities in the United States (FIGURE 34. 22). The men were partners of women who had become pregnant and were visiting a prenatal clinic, so all were fertile. Of the four cities, Columbia, Missouri, is located in the county with the most farmlands. New York City in New York is in an area with no agriculture.

    Location of Clinic  
  Columbia, Missouri Los Angeles, California Minneapolis, Minnesota New York, New York
Average age 30.7 29.8 32.2 36.1
Percent nonsmokers 79.5 70.5 85.8 81.6
Percent with history of STD 11.4 12.9 13.6 15.8
Sperm count (million/ml) 58.7 80.8 98.6 102.9
Percent motile sperm 48.2 54.5 52.1 56.4

FIGURE 34.22 Characteristics men h four cities. All men were partners of woman who visited prenatal health clinics, and so were presumably fertile. STD stands for sexually transmitted disease.

4. Do these data support the hypothesis that living near farmlands can adversely affect male reproductive function?

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