Professor Kerstin Johannesson is awarded Björn Carlsons Östersjöpris 2025

– Awarded SEK 4 million for groundbreaking research combining genetics, marine ecology, and conservation, with a particular focus on the Baltic Sea.

Today, Professor Kerstin Johannesson of the University of Gothenburg has been named the winner of the Björn Carlson Östersjöpris 2025. She is recognized for her groundbreaking research that has transformed our understanding of marine evolutionary biology and strengthened efforts to build a healthier, more resilient Baltic Sea.

Professor Johannesson’s work combines advanced molecular techniques with deep ecological insight into how species adapt and evolve in changing environments. Her research has revealed that genetic diversity declines progressively from the North Sea into the Baltic, and that sharp genetic boundaries appear in transition zones such as the Kattegat–Öresund, where environmental conditions shift rapidly. She has also shown that many marine species in the Baltic consist of unique, locally adapted populations.

These discoveries portray the Baltic Sea as a natural “Darwinian laboratory,” where species evolve rapidly to cope with shifting and often harsh conditions. They also underscore the critical importance of considering genetic diversity when conserving and managing marine species.

Christina Rudén, Chair of the Nomination Committee, highlights not only Johannesson’s scientific breakthroughs but also her dedication to sustainable marine environments. “She has been a strong advocate for protecting ‘ordinary’ species and has shown visionary leadership in launching major research initiatives,” Rudén says.

Beyond her research, Johannesson has served as an expert and advisor to politicians and decision-makers. She is also a passionate science communicator, engaging schools and the public with accessible, compelling explanations of complex research—acting as a vital bridge between academia, policy, and practical environmental action.

“I am proud and grateful, and I will continue working for a healthier Baltic Sea,” says prize winner Kerstin Johannesson.

The Björn Carlson Östersjöpris 2025 will be presented on September 23 at Hasselbacken in Stockholm. The award includes a grant of SEK 4 million, provided by Björn Carlsons Östersjöstiftelse, to further support efforts for a healthier Baltic Sea.