Narwhals, or the “unicorns of the sea,” could be at risk from additional Arctic shipping routes as polar ice continues to recede. A peer-reviewed study published in Proceedings of the National Academy of Sciences suggests as many as seven marine mammal species may face new threats and uncertain consequences from increased ship traffic.

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The Arctic Ocean is home to hundreds of animals, like narwhals, polar bears and whales. However, as the polar ice caps retreat, more shipping companies are taking advantage of open waters to reduce travel time.

To determine how the increase of ships could affect marine mammals, the research team from University of Alaska Fairbanks and University of Washington studied wildlife during the fall shipping season. The group looked at 80 different subpopulations among the seven species to determine if they were directly exposed to the ships and how much these ships could affect the wellbeing of the marine life.

Related: The melting Arctic is already changing the ocean’s circulation

During the study period, over half of the subpopulations were impacted by ships, with narwhals inheriting the highest amount of risk. In addition to an increased risk of injury or death from collisions, toothed whales also face communication challenges because of their audio sensitivity. Like dolphins, the ocean unicorn “talks” with a language of buzzing, clicking and calling.

While narwhals could have the most to lose, polar bears and seals have the least risk because of the time they spend on land. But researchers note their populations also come with high long-term uncertainty, and the team concluded more data is required to determine how shipping affects their livelihood.

The news wasn’t entirely bad for wildlife populations. The scientists noted through additional data collection, shipping companies could plan for environmentally-sustainable transportation options.

“Regions with geographic bottlenecks, such as the Bering Strait and eastern Canadian Arctic, were characterized by two to three times higher vulnerability than more remote regions,” the researchers wrote in their study abstract. “These pinch points are obligatory pathways for both vessels and migratory [ocean mammals], and so represent potentially high conflict areas but also opportunities for conservation-informed planning.”

Arctic planning groups are aware of the wildlife threats and are working out plans to balance shipping with environmental concerns. The Arctic Council instituted regulations on transport companies in January 2017, with the goal of making shipping safer for both crews and marine mammals.

+ Proceedings of the National Academy of Sciences

Via Earther