Investigation Reveals Arctic Bear DNA Changes Could Help Adaptation to Climate Warming
Experts have observed changes in Arctic bear DNA that may help the mammals adjust to hotter environments. This study is considered to be the primary instance where a statistically significant association has been found between rising temperatures and evolving DNA in a wild animal species.
Global Warming Threatens Arctic Bear Future
Environmental degradation is jeopardizing the survival of Arctic bears. Estimates show that two-thirds of them could be lost by 2050 as their frozen habitat retreats and the weather becomes more extreme.
“The genome is the guidebook inside every cell, guiding how an creature grows and matures,” stated the principal investigator, Dr. Alice Godden. “By examining these animals’ expressed genes to area environmental information, we observed that escalating heat seem to be fueling a dramatic rise in the function of transposable elements within the specific area polar bears’ DNA.”
DNA Study Shows Significant Adaptations
The team studied biological samples taken from polar bears in different areas of Greenland and contrasted “jumping genes”: tiny, movable sections of the genetic code that can affect how different genes operate. The analysis examined these genetic markers in relation to climate conditions and the related shifts in genetic activity.
As local climates and nutrition evolve due to changes in ecosystem and prey forced by climate change, the genetic makeup of the bears appear to be adjusting. The population of polar bears in the most temperate part of the country showed greater modifications than the communities in colder regions.
Possible Evolutionary Response
“This discovery is significant because it demonstrates, for the first time, that a distinct group of polar bears in the hottest part of Greenland are employing ‘mobile genetic elements’ to rapidly modify their own DNA, which may be a critical survival mechanism against retreating sea ice,” added Godden.
The climate in the colder region are more frigid and less variable, while in the southern zone there is a more temperate and less icy habitat, with steep climate variability.
Genomic information in species evolve over time, but this mechanism can be accelerated by external pressure such as a changing environment.
Nutritional Changes and Genetic Hotspots
There were some interesting DNA changes, such as in sections associated to energy storage, that could assist Arctic bears survive when food is scarce. Animals in temperate zones had a greater proportion of fibrous, vegetarian diets in contrast to the fatty, seal-based nutrition of northern bears, and the DNA of south-eastern bears seemed to be adjusting to this new reality.
Godden stated: “Scientists found several key genomic regions where these mobile elements were particularly busy, with some situated in the functional gene sections of the genome, indicating that the bears are undergoing swift, profound evolutionary shifts as they adjust to their melting icy environment.”
Next Steps and Protection Efforts
The subsequent phase will be to study different subspecies, of which there are 20 worldwide, to observe if similar genetic shifts are occurring to their DNA.
This investigation may help protect the bears from dying out. However, the scientists noted that it was crucial to slow climate change from accelerating by lowering the burning of coal, oil, and gas.
“We cannot be complacent, this presents some hope but does not mean that Arctic bears are at any less threat of disappearance. It is imperative to be doing every action we can to reduce greenhouse gas output and decelerate global warming,” summarized Godden.
