New insights into the effects of radiation from Chernobyl

Chernobyl
A radioactive sign at Chernobyl Exclusion Zone, Ukraine. Credit: Unsplash/CC0 Public Domain

Researchers at the University of Stirling have found that animals in lakes closest to the Chernobyl nuclear reactor have more genetic mutations than those from further away, giving new insight into the effect of radiation on wild species.

DNA analysis of freshwater crustaceans, called Daphnia, revealed greater genetic diversity in lake populations that experienced the highest radiation dose rates following the accident in 1986. Radiation is the primary cause of these , according to Dr. Stuart Auld, who led the research.

Dr. Auld, of Stirling's Faculty of Natural Sciences, said: "Chernobyl is a natural experiment in evolution, because the rate of genetic mutation is higher, and all is fuelled by mutations.

"Normally you have to wait for generations to see the effect of the environment on mutations, and most mutant animals are pretty damaged so don't live long. By sequencing non-coding DNA—bits of genetic code that don't actually affect the form or function of the organism—we were able to uncover these mutations.

As part of her Ph.D., Dr. Jessica Goodman collected the crustaceans using a kayak and net from lakes at varying distances from Chernobyl. She flew the samples back to the lab at Stirling, where Dr. Auld's team isolated and analyzed the DNA.

'Humans are way worse than radiation'

Dr. Auld continued: "In a world affected by , we really need to understand as an option, and its potential effects on natural populations.

"We know that exposure to acute radiation is terrible, but actually low levels are nowhere near as bad as we think. And many of the animals around Chernobyl have actually done very well, because the humans left—and it turns out we are way worse than radiation."

The paper, "Radiation-mediated supply of genetic variation outweighs the effects of selection and drift in Chernobyl Daphnia populations," is published in the Journal of Evolutionary Biology.


Explore further

Bumblebees exposed to Chernobyl-levels of radiation consume more nectar

More information: Jessica Goodman et al, Radiation‐mediated supply of genetic variation outweighs the effects of selection and drift in Chernobyl Daphnia populations, Journal of Evolutionary Biology (2022). DOI: 10.1111/jeb.13983
Journal information: Journal of Evolutionary Biology

Citation: New insights into the effects of radiation from Chernobyl (2022, January 26) retrieved 12 August 2022 from https://phys.org/news/2022-01-insights-effects-chernobyl.html
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.
62 shares

Feedback to editors