Researchers have identified changes in polar bear DNA that might assist the mammals adapt to increasingly warm environments. This study is believed to be the primary instance where a notable link has been established between escalating temperatures and shifting DNA in a free-ranging mammal species.
Environmental degradation is jeopardizing the survival of Arctic bears. Projections show that a significant majority of them could be lost by 2050 as their icy habitat disappears and the climate becomes more extreme.
“DNA is the guidebook within every cell, instructing how an organism grows and develops,” explained the study author, Dr. Alice Godden. “By examining these animals’ functioning genes to area climate data, we observed that rising temperatures appear to be causing a substantial rise in the behavior of transposable elements within the south-east Greenland polar bears’ DNA.”
Researchers examined biological samples taken from Arctic bears in separate zones of Greenland and contrasted “jumping genes”: tiny, roving pieces of the genome that can influence how other genes operate. The research focused on these genetic markers in connection to climate conditions and the related shifts in genetic activity.
As local climates and nutrition change due to changes in environment and food supply driven by global heating, the genetic makeup of the bears appear to be adapting. The group of bears in the warmest part of the area displayed more modifications than the communities in colder regions.
“This result is crucial because it indicates, for the first instance, that a unique group of Arctic bears in the hottest part of Greenland are using ‘mobile genetic elements’ to quickly alter their own DNA, which might be a critical survival mechanism against retreating sea ice,” added Godden.
Conditions in the northern area are less variable and more stable, while in the southern zone there is a more temperate and ice-reduced habitat, with steep climate variability.
Genetic code in organisms change over time, but this evolution can be accelerated by external pressure such as a quickly warming environment.
The study noted some notable DNA changes, such as in areas linked to fat processing, that may assist polar bears cope when food is scarce. Bears in temperate zones had more terrestrial diets compared with the lipid-rich, marine diets of northern bears, and the DNA of these specific animals appeared to be adapting to this new reality.
Godden stated: “Scientists found several active DNA areas where these mobile elements were highly active, with some located in the functional gene sections of the DNA, suggesting that the animals are subject to fast, significant DNA modifications as they adapt to their melting Arctic home.”
The subsequent phase will be to look at other polar bear populations, of which there are 20 globally, to determine if comparable changes are taking place to their DNA.
This study may help conserve the animals from extinction. However, the scientists emphasized that it was crucial to halt global warming from escalating by cutting the consumption of coal, oil, and gas.
“We cannot be complacent, this presents some hope but does not mean that Arctic bears are at any less danger of disappearance. We still need to be undertaking every action we can to reduce greenhouse gas output and mitigate temperature increases,” summarized Godden.
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