There is evidence to suggest that climate change is contributing to the decline of several starfish species in North America. Elevated sea temperatures and ocean acidification, both consequences of climate change, have been linked to mass mortality events and disruptions in the reproductive cycles of starfish.

Sea stars, also known as starfish, play a vital role in maintaining the balance of marine ecosystems by controlling populations of prey species such as mussels, barnacles, and sea urchins. Their decline can disrupt the food chain and have cascading effects on other marine organisms, including fish, seabirds, and marine mammals.

In particular, the sunflower sea star (Pycnopodia helianthoides), found off the Pacific Coast of North America, has experienced significant population declines since 2013 due to a condition called sea star wasting disease. The disease is associated with a specific strain of Vibrio bacteria, which thrives in warmer waters. The bacteria invade the starfish's body, causing lesions and tissue damage. Weakened starfish become more susceptible to predation or starvation.

Other starfish species, such as the purple sea star (Pisaster ochraceus), the ochre sea star (Pisaster ochraceus), and the red sea star (Echinaster sangunineus), have also been affected by mass die-offs along the Pacific Coast. While the exact causes of these events may differ, climate change is believed to be a primary driver, as rising sea temperatures can lead to increased stress on starfish populations.

To mitigate the impact of climate change on starfish and other marine species, efforts are being made to reduce greenhouse gas emissions, improve water quality, and establish marine protected areas. By taking these steps, we can work to preserve the biodiversity and health of our oceans.