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Amphibians, most of which breed in water, are susceptible to the impacts of water-borne pharmaceuticals. (Photo: Carey James Balboa/Wikimedia/cc)

Amphibians, most of which breed in water, are susceptible to the impacts of water-borne pharmaceuticals. (Photo: Carey James Balboa/Wikimedia/cc)

Pharmaceutical Dumping Could Pose Risks to Wildlife, Scientists Warn

Research published Monday finds drugs for treating humans and animals are seeping into wild environments, causing changes in ecosystems

Sarah Lazare, staff writer

What happens when the drugs used to treat humans and animals are disposed? Scientific studies published Monday in a special issue of the journal Philosophical Transactions of the Royal Society B reveal that pharmaceuticals, when flushed into land and water ecosystems, could pose risks to wildlife, from altering species' behavior to changing fertility rates to death.

Pharmaceuticals can enter wild environments through a variety of routes, including dumping from drug manufacturers, as well as sewage.

"Global pharmaceutical consumption is rising with the growing and aging human population and more intensive food production," write Kathryn E. Arnold of the University of York in the UK and colleagues. "Recent studies have revealed pharmaceutical residues in a wide range of ecosystems and organisms." Despite the scope of the issue, the effects of pharmaceuticals in the environment are little researched and understood.

But in the research series published Monday, scientists uncover a broad spectrum of impacts.

Wild starlings, exposed to the anti-depressant fluoxetine, undergo changes in behavior and physiology, including shifts in feeding frequency. At the Experimental Lakes Area in northwestern Ontario, Canada, estrogen from birth control pills was found to alter the entire ecosystem of the lake, leading to a decline in trout, an increase in insects, and the elimination of fathead minnows. Another study finds that amphibians, because most of them breed in water, "may therefore be exposed to water-borne pharmaceuticals during critical phases of the reproductive cycle," posing risks to fertility.

Researchers Anette Küster and Nicole Adler, of Germany’s Federal Environment Agency, point out, "For human medicinal products, hormones, antibiotics, analgesics, antidepressants and antineoplastics indicated an environmental risk. For veterinary products, hormones, antibiotics and parasiticides were most often discussed as being environmentally relevant."

They argue that more research and regulation is needed: "In order to minimize the quantity of pharmaceuticals in the environment [legislation and research] should aim to (i) improve the existing legislation for pharmaceuticals, (ii) prioritize pharmaceuticals in the environment and (iii) improve the availability and collection of pharmaceutical data."


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