NDLI: Reproductive Consequences of Exposure to Waterborne Phytoestrogens in Male Fighting Fish Betta splendens

Content Provider	Springer Nature Link
Author	Stevenson, Louise M. Brown, Alexandria C. Montgomery, Tracy M. Clotfelter, Ethan D.
Copyright Year	2010
Abstract	Phytoestrogens are plant compounds that can act as endocrine disruptors in vertebrates. Biologically active levels of phytoestrogens have been found in aquatic habitats near wood pulp and paper mills, biofuel manufacturing plants, sewage-treatment plants, and agricultural fields. Phytoestrogens are known to cause hormonal and gonadal changes in male fish, but few studies have connected these effects to outcomes relevant to reproductive success. In one experiment, we exposed sexually mature male fighting fish Betta splendens to environmentally relevant (1 μg L−1) and pharmacological concentrations (1000 μg L−1) of the phytoestrogen genistein as well as to a positive control of waterborne 17β-estradiol (E2; 1 μg L−1), and a negative control of untreated water. In a second experiment, we exposed male B. splendens to environmentally relevant concentrations (1 μg L−1) of genistein and β-sitosterol singly and in combination as well as to the positive and negative controls. All exposures were 21 days in duration. We measured sex-steroid hormone levels, gonadosomatic index (GSI), sperm concentration and motility, and fertilization success in these fish. We found that exposure to genistein did not affect circulating levels of the androgen 11-ketotestosterone or the estrogen E2 relative to negative-control fish. We also found that neither of the compounds nor their mixture affected GSI, sperm concentration or motility, or fertilization success in exposed fish relative to negative-control fish. However, fish exposed to phytoestrogens showed some evidence of fewer but more motile sperm than fish exposed to the positive control E2. We conclude that sexually mature male B. splendens are relatively immune to reproductive impairments from short-term exposure to waterborne phytoestrogens.
Starting Page	501
Ending Page	510
Page Count	10
File Format	PDF
ISSN	00904341
Journal	Archives of Environmental Contamination and Toxicology
Volume Number	60
Issue Number	3
e-ISSN	14320703
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-06-30
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Environmental Chemistry Pollution Ecotoxicology Environmental Health Environmental Monitoring/Analysis Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Pollution Health, Toxicology and Mutagenesis Medicine Toxicology

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