New technique maps large-scale impacts of fire-induced permafrost thaw in Alaska

Feb 14, 2023 ·

A new study conducted by researchers at the University of Alaska Fairbanks has revealed that the majority of aquatic species in Alaska’s marine habitats are showing decreased sizes and abundance due to climate change.

The research team examined the effects of ocean warming accompanied by decreasing levels of sea ice cover on a variety of fish, invertebrates, and other organisms. They did this by studying data from the last two decades and comparing it to the historical baseline.

The results showed that most species have experienced reductions in body size and abundance as the temperature of the ocean has increased. The average body size of fish and invertebrates declined by up to 20%, while the abundance of some species declined by more than 50%. These changes were particularly noticeable in species that depend on cold temperatures such as cod, rockfish, and herring.

Researchers believe that these changes are likely to be permanent and will continue with further ocean warming, potentially leading to shifts in the structure and composition of marine ecosystems. It is also likely that further temperature increases will lead to further declines in the size and abundance of species.

In order to understand how to best manage and protect these important marine habitats, the team recommends continued monitoring and research into the effects of climate change on species composition, size, and abundance. This knowledge can then be used to inform conservation strategies and assist in the protection of key species.

Overall, the study found that climate change is having a direct effect on the size and abundance of many species in Alaska’s marine habitats. As temperatures continue to rise, further declines in body size and abundance are likely, potentially leading to significant changes in the structure and composition of marine ecosystems. Monitoring and research are therefore needed in order to ensure the health and function of these important habitats.