Summit County Citizens Voice

A red shiner.

Hormone-mimicking chemical could result in inter-species breeding

By Summit Voice

SUMMIT COUNTY — Already pinpointed as a potential health risk to humans, the controversial chemical BPA has now been found to affect the mating choices of fish. potentially leading to inter-breeding of species.

BPA, used in the manufacture of plastic household products, is hormone-mimicking chemical now widely found in aquatic ecosystems across the U.S. The chemical has been banned from baby bottles and childrens’ cups in 11 states.

BPA breaks down into molecules with estrogen-like properties and is suspected of changing male fish into females. The recent study, led by Dr, Jessica Ward, of the University of Minnesota, focused on blacktail shiner and red shiner, common species found in many rivers.

“Chemicals from household products and pharmaceuticals frequently end up in rivers and BPA is known to be present in aquatic ecosystems across the United States,” said Ward. “Until now studies have primarily focused on the impact to individual fish, but our study demonstrates the impact of BPA on a population level.”

The team collected individuals of both species from two streams in the state of Georgia. The species were kept separated for 14 days in tanks, some of which contained BPA. On the 15th day, behavioral trials were undertaken as individual fish from different tanks were introduced to each other.

The scientists monitored any physiological or signalling differences the individuals displayed, such as color, as well as any behavioral differences during courtship, such as mate choice.

BPA disrupts an individual’s endocrine system, which controls the release of hormones. This impacts behavior and appearance, which in turn can lead an individual to mistake a newly introduced species as a potential mate.

This process poses long-term ecological consequences, especially in areas threatened by the introduction of invasive species. BPA and other hormone-mimicking chemicals can escalate the loss of native biodiversity by breaking down species barriers and promoting the invader.

“Our research shows how the presence of these manmade chemicals leads to a greater likelihood of hybridization between species,” concluded Ward. “This can have severe ecological and evolutionary consequences, including the potential for the decline of our native species.”

The study was published in Evolutionary Applications.

Filed under: biodiversity, Environment Tagged: | aquatic ecosystems, BPA, Environment, fish, hormones