Experts have detected changes in Arctic bear DNA that may assist the animals adapt to hotter conditions. This investigation is believed to be the initial instance where a meaningful connection has been found between rising heat and evolving DNA in a wild animal species.
Climate Breakdown Puts at Risk Arctic Bear Future
Climate breakdown is threatening the existence of Arctic bears. Estimates suggest that two-thirds of them might disappear by 2050 as their snowy habitat disappears and the weather becomes more extreme.
“The genome is the blueprint inside every cell, guiding how an creature evolves and functions,” stated the study author, Dr. Alice Godden. “By comparing these animals’ functioning genes to regional climate data, we observed that increasing heat seem to be fueling a significant rise in the behavior of transposable elements within the specific area bears’ DNA.”
DNA Study Uncovers Significant Adaptations
The team studied tissue samples taken from polar bears in separate zones of Greenland and compared “jumping genes”: compact, movable pieces of the genome that can influence how other genes work. The study examined these genes in correlation to temperatures and the associated variations in genetic activity.
As regional weather and diets change due to alterations in ecosystem and food supply forced by warming, the genetic makeup of the bears seem to be evolving. The community of polar bears in the warmest part of the country showed greater genetic shifts than the communities to the north.
Possible Evolutionary Response
“This finding is significant because it indicates, for the first instance, that a particular group of Arctic bears in the hottest part of Greenland are utilizing ‘mobile genetic elements’ to quickly modify their own DNA, which may be a desperate survival mechanism against melting Arctic ice,” added Godden.
The climate in north-east Greenland are colder and less variable, while in the south-east there is a significantly hotter and ice-reduced habitat, with steep climate variability.
Genomic information in organisms evolve over time, but this process can be accelerated by climate pressure such as a quickly warming environment.
Nutritional Changes and Active DNA Areas
Scientists observed some interesting DNA changes, such as in regions connected to fat processing, that might assist polar bears cope when resources are limited. Animals in temperate zones had increased fibrous, vegetarian food intake in contrast to the fatty, seal-based diets of Arctic bears, and the DNA of these specific animals seemed to be evolving to this new reality.
Godden explained further: “Scientists found several genetic hotspots where these mobile elements were highly active, with some found in the protein-coding regions of the genome, suggesting that the animals are subject to swift, fundamental DNA modifications as they adjust to their vanishing Arctic home.”
Further Study and Protection Efforts
The subsequent phase will be to look at other polar bear populations, of which there are 20 around the world, to observe if comparable modifications are occurring to their DNA.
This research could assist protect the bears from dying out. However, the experts emphasized that it was essential to halt climate change from accelerating by lowering the burning of fossil fuels.
“Caution is still required, this offers some promise but does not mean that Arctic bears are at any diminished risk of extinction. We still need to be pursuing everything we can to decrease greenhouse gas output and slow climate change,” summarized Godden.
