We’ve been observing the movements and unfortunate deaths of gray whales around San Francisco Bay. This is part of a broader effort to understand changes in the marine environment, many of which trace back to climate change.
Recently, a sharp increase in gray whale sightings and deaths has gotten our attention. Researchers are digging deep to uncover the causes of these events, which could be linked to shifts occurring thousands of miles away.
Dr. Matthew Savoca from Stanford’s Hopkins Marine Station emphasizes that the story is complex. He studies threats to whale food chains and notes that climate change significantly impacts gray whales. “It’s not just one factor,” he explains. “Arctic climate changes affect their feeding patterns, even here on our coast.”
Gray whales undertake one of the longest migrations of any whale, traveling from the Arctic to Mexico and back. Normally, they rely on ample food to fuel this journey. However, melting ice in the Arctic could be disrupting their food supply at the seafloor.
Back in 2019, an unusual mortality event (U.M.E.) was declared, with many gray whales showing signs of starvation. Although that crisis has since passed, researchers worry this uptick in deaths could signal a worsening trend. Giancarlo Rulli from the Marine Mammal Center mentions, “Since the U.M.E., we’ve seen a mix of outcomes in San Francisco Bay.” In 2024, only six gray whales entered the Bay, but that number jumped to 36 sightings last year, with 21 dead found along the coast.
Research indicates that some gray whales are now staying in the Bay longer than before, sometimes for months during late winter and early spring. This may hint at changing feeding habits or challenges along their migration path.
Temperature rises in the Arctic are alarming. Reports show that the region is warming faster than any other part of the planet, affecting marine life in significant ways. Dr. Savoca pointed out a historic change: gray whales have been spotted off the East Coast for the first time in centuries, likely due to increasing openness in Arctic waters.
“There’s now an ice-free Arctic in summer,” he said. “Gray whales can traverse this region, potentially leading them to recolonize areas they haven’t visited in a long time.”
These changes underscore the urgent need for researchers to continue monitoring this remarkable species. As the environment shifts rapidly, understanding the health and migration patterns of gray whales becomes more crucial than ever.
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