Unveiling the Culprit: Vibrio pectenicida Identified as the Cause of Sea Star Wasting Disease
A recent study published in Nature Ecology & Evolution has identified the cause of sea star wasting disease (SSWD), a devastating marine epidemic that has killed billions of sea stars across the Pacific coast. The research team, led by scientists from the Hakai Institute, the University of British Columbia (UBC), and the University of Washington, discovered that a strain of the bacterium Vibrio pectenicida is responsible for the disease.
SSWD begins with external lesions on sea stars and progresses to tissue melting, ultimately leading to the death of infected individuals. The disease has had a significant impact on sunflower sea stars, with over 90% of the population being wiped out in the past decade. This loss has disrupted coastal ecosystems, particularly kelp forests, which rely on sea stars to control sea urchin populations.
The identification of V. pectenicida as the causative agent of SSWD is a crucial step in understanding and addressing the disease. The research team conducted a four-year investigation, isolating the bacterium from infected sea stars and confirming its role in causing the disease through laboratory experiments. This discovery will inform future efforts to manage and recover sea star populations and the ecosystems they support.
Moving forward, researchers will explore the relationship between SSWD and rising ocean temperatures, as Vibrio bacteria are known to thrive in warm water. By understanding the drivers of the disease, scientists hope to develop strategies to protect sea stars and restore their populations in the wild. The findings of this study offer hope for the recovery of sunflower sea stars and the preservation of kelp forest ecosystems along the Pacific coast.