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Long-term exposure to environmental concentrations of the pharmaceutical ethynylestradiol causes reproductive failure in fish.

Abstract：

:Heightened concern over endocrine-disrupting chemicals is driven by the hypothesis that they could reduce reproductive success and affect wildlife populations, but there is little evidence for this expectation. The pharmaceutical ethynylestradiol (EE2) is a potent endocrine modulator and is present in the aquatic environment at biologically active concentrations. To investigate impacts on reproductive success and mechanisms of disruption, we exposed breeding populations (n = 12) of zebrafish (Danio rerio) over multiple generations to environmentally relevant concentrations of EE2. Life-long exposure to 5 ng/L EE2 in the F1 generation caused a 56% reduction in fecundity and complete population failure with no fertilization. Conversely, the same level of exposure for up to 40 days in mature adults in the parental F0 generation had no impact on reproductive success. Infertility in the F1 generation after life-long exposure to 5 ng/L EE2 was due to disturbed sexual differentiation, with males having no functional testes and either undifferentiated or intersex gonads. These F1 males also showed a reduced vitellogenic response when compared with F0 males, indicating an acclimation to EE2 exposure. Depuration studies found only a partial recovery in reproductive capacity after 5 months. Significantly, even though the F1 males lacked functional testes, they showed male-pattern reproductive behavior, inducing the spawning act and competing with healthy males to disrupt fertilization. Endocrine disruption is therefore likely to affect breeding dynamics and reproductive success in group-spawning fish. Our findings raise major concerns about the population-level impacts for wildlife of long-term exposure to low concentrations of estrogenic endocrine disruptors.

journal_name

Environ Health Perspect

journal_title

Environmental health perspectives

authors

Nash JP,Kime DE,Van der Ven LT,Wester PW,Brion F,Maack G,Stahlschmidt-Allner P,Tyler CR

doi

10.1289/ehp.7209

subject

Has Abstract

pub_date

2004-12-01 00:00:00

pages

1725-33

issue

eissn

0091-6765

issn

1552-9924

journal_volume

112

pub_type

杂志文章

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Long-term exposure to environmental concentrations of the pharmaceutical ethynylestradiol causes reproductive failure in fish.