Abstract:
:Atrazine is the most extensively used herbicide in the United States. Part-per-million concentrations of atrazine have been reported in agricultural runoff. It is detectable in surface waters and precipitation throughout the year, and it has been found in groundwater sources of drinking water. Recent studies indicate that atrazine may be a potent endocrine-disrupting compound in frogs exposed to part-per-billion (microg/L) concentrations. For these reasons, the effects of atrazine (5 and 50 microg/L) on several endpoints related to reproductive fitness were examined in fathead minnows (Pimephales promelas) in a 21-d static exposure. Estradiol (0.5 microg/L) was included as a positive-control treatment. Endpoints examined in adult fish during and after the exposures included survival, egg production, number of spawns, eggs/spawn, relative gonad weight, gonad histology, number of nuptial tubercles, and plasma vitellogenin concentration. Eggs produced during the exposures were hatched and reared in control water. The percentages of embryos fertilized and hatched as well as larval survival were evaluated. Decreasing trends were observed in relative testis weight, testis maturity, and percentage embryo fertilization. These trends suggest that further investigation is warranted, but the differences in these and other endpoints were not statistically significant in the atrazine-exposed fish. Nearly all endpoints concerning fish exposed to estradiol were significantly different from atrazine-exposed fish and control fish. These results suggest that atrazine did not have strong estrogenic effects in adult fathead minnows and did not cause overt reproductive toxicity at environmentally relevant concentrations.
journal_name
Environ Toxicol Chemjournal_title
Environmental toxicology and chemistryauthors
Bringolf RB,Belden JB,Summerfelt RCdoi
10.1897/03-180subject
Has Abstractpub_date
2004-04-01 00:00:00pages
1019-25issue
4eissn
0730-7268issn
1552-8618journal_volume
23pub_type
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