Effect of Arctic sea ice meltdown on marine mammals revealed

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Researchers for the first-ever time have gauged the ecological status of marine mammals living in the Arctic and the effect which the meltdown of ice and temperature increase in the region is having on these mammals.

Researchers claim that for the Arctic marine mammals, the future is especially uncertain owing to loss of sea ice and warming temperatures. The University of Washington study, assessing the status of all circumpolar species and subpopulations of Arctic marine mammals, including seals, whales and polar bears, underscores the precarious state of those mammals and outlines the current state of knowledge and their recommendations for the conservation of these animals over the 21st century.

Lead author Kristin Laidre said that these species are not only icons of climate change, but they are indicators of ecosystem health, and key resources for humans.

The overall numbers and trends due to climate change are unknown for most of the 78 populations of marine mammals included in the report: beluga, narwhal and bowhead whales; ringed, bearded, spotted, ribbon, harp and hooded seals; walruses; and polar bears.

Accurate scientific data, currently lacking for many species, will be key to making informed and efficient decisions about the conservation challenges and tradeoffs in the 21st century, said Laidre.

Despite the lack of data, researchers have said that the species most at risk from the changes are polar bears and ice-associated seals. Laidre said that these animals require sea ice to find food, find mates and reproduce, to rear their young. It’s their platform of life. It is very clear those species are going to feel the effects the hardest.

Whales may actually benefit from less ice cover, at least initially, as the open water could expand their feeding habitats and increase food supplies. Approximately 78 per cent of the Arctic marine mammal populations, included in the study, are legally harvested for subsistence across the Arctic.

There’s no other system in the world where top predators support human communities the ways these species do, Laidre said.

Among the few recommendations are maintaining and improving co-management with local and governmental entities for resources, recognizing variable population responses to climate change and incorporating those into management, improving long-term monitoring while recognizing monitoring for all species will be impossible, studying and mitigating the impacts of increasing human activities and recognizing the limits of protected species legislation.

The study is published in Conservation Biology.