Decade-long study captures life of marine mammals on climate-threatened frisian islands

For the past decade, scientist and photographer Jeroen Hoekendijk has been documenting the remarkable lives of pinnipeds—seals, sea lions, and walruses—across the Frisian Islands, a fragile chain of barrier islands stretching along the North Sea coasts of the Netherlands, Germany, and Denmark. His stunning photography project captures both the raw beauty and harsh realities of marine mammal life in one of Europe’s most vulnerable coastal ecosystems.

These low-lying islands represent the last remnants of Doggerland, an ancient landmass that connected Britain to continental Europe before being submerged after the last ice age. Today, the Frisian Islands serve as a critical habitat for marine mammals, but they also stand as a stark warning of our climate future. As sea levels continue to rise and coastal storms intensify due to global warming, these islands face an uncertain future.

Hoekendijk’s work provides invaluable scientific documentation of pinniped behavior and populations while creating a visual record of an ecosystem under threat. His photographs reveal the complex social dynamics of these marine mammals—from tender moments between mothers and pups to the fierce territorial battles that earn them the nickname “sea hounds.” The project highlights how these remarkable creatures have adapted to life in harsh marine environments, even as rising seas and changing weather patterns pose new challenges.

The timing of this documentation proves crucial, as scientists work to understand how climate change will impact marine mammal populations and the delicate island ecosystems they depend on for breeding, resting, and feeding.