According to a researcher, thousands of synthetic chemicals could be disrupting the genetic makeup of birds before they hatch, as highlighted in recent research on ducklings.
Scientists from the Norwegian University of Science and Technology (NTNU) injected small doses of per- and polyfluoroalkyl substances (PFAS) into mallard duck eggs to investigate their effects.
The findings revealed that these chemicals could alter the ducklings’ DNA, switching genes on and off in various organs, ultimately reducing their chances of survival.
PFAS, often referred to as “forever chemicals,” are a category of synthetic substances that are notably resistant to environmental degradation.
In this experiment, researchers injected three different persistent chemicals into the duck eggs to evaluate their impacts. The eggs were then sealed in wax and incubated until they hatched.
Although the study was conducted in a controlled lab setting, the aim was to replicate the type of exposure these eggs might naturally receive from their mothers.
Immediately after hatching, scientists collected samples from the ducklings’ livers, hearts, and a unique organ known as the bursa of Fabricius, which plays a crucial role in the immune system.
Results indicated that in the liver, two of the three persistent chemicals triggered genetic modifications in the ducklings, affecting genes related to fat metabolism.
The study’s lead author, En Fleur Brand, emphasized, “Mallards need to regulate fat storage and consumption precisely during both breeding and migration seasons.”
“Alterations in fat metabolism may hinder survival or reproductive success.”
Meanwhile, scientists were surprised to find no significant changes in the hearts of the ducklings, although bursa of Fabricius showed effects in all PFAS-exposed individuals.
Brand remarked, “We observed increased activity in genes typically involved in viral infection detection. However, the implications for the birds remain unclear.”
The researchers concluded that PFAS could be detrimental to young wildlife, such as ducklings, and advocated for stricter regulations on these chemicals.
While some PFAS have been permanently banned, thousands remain in use, and their impacts on animals, humans, and the environment are still not completely understood.
In their study, scientists assessed one widely regulated or banned permanent chemical, applicable in the European Union, the United Kingdom, and the United States, along with two others still in circulation.
Brand stated, “These substances are prevalent in a multitude of products, ranging from frying pans and waterproof clothing to fire extinguishers, food packaging, and antifouling coatings.”
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Source: www.sciencefocus.com
