Research reveals Pacific gray whales are shrinking in size.
In a recent study published in "Global Change Biology", it was found that the average body size of Pacific gray whales has decreased by around 13% over the past two decades. This reduction could have significant effects on their reproduction, and ultimately, survival.
The study, which focused on a group of around 200 Pacific gray whales in the north-eastern Pacific, indicated that these animals are facing serious issues. Previously known as "ecosystem sentinels", this population of gray whales mostly stays close to the coast and feeds in shallower, warmer waters compared to other gray whale communities. The scientists examined drone images of these whales from the years 2000 to 2020 and discovered that the average body size of adults during that period had reduced by about 13%.
Scientist Kevin Bierlich told AFP, "This may be an early indication that their population is declining." The study also notes that female gray whales, who were historically larger than males, are now of the same average size as the males.
The researchers attributed this shrinking to the impact of climate change on ocean circulation. They specifically pointed to fluctuations in ocean currents - which are vital for plankton growth, a major source of food for the gray whales.
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The reduction in the average body size of Pacific gray whales could pose a threat to their reproduction and overall survival, as smaller whales often have lower reproductive success rates. Furthermore, the findings of this study suggest that gray whales in the Pacific are facing significant challenges, which may be linked to climate change's impact on ocean circulation and plankton growth, a critical food source.
