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#water contamination

2 public questions tagged with this topic.

Applied Ecology

Which type of pollution is caused by estrogen from pharmaceuticals?

Pharmaceutical estrogens entering water act as endocrine-disrupting contaminants because they mimic or alter normal hormonal signalling at very low concentrations. Binding to estrogen receptors changes gene expression, reproductive development, vitellogenin production, sex differentiation, and fertility in exposed organisms. This mode of action is distinct from direct neurotoxicity, DNA mutation, or acidification, although one chemical can sometimes have more than one biological effect. Monitoring should include appropriate controls, spatial replication, temporal variation, and validated analytical methods before broad conclusions are drawn. Community-level consequences can emerge when physiological injury changes survival, reproduction, species interactions, or the flow of energy through food webs. Aquatic effects depend on chemical form, persistence, solubility, dose, and the capacity of organisms to metabolise or excrete the substance. Catchment processes connect land use with rivers, lakes, estuaries, and coastal waters, so prevention at the source is usually more effective than downstream treatment. Ecological assessment distinguishes hazard from risk: a substance may be intrinsically harmful, but realised impact also requires sufficient environmental exposure.

Ref: Campbell Biology, Urry et al., 12th Ed., Unit 8 Ecology

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