Whale watchers in southwest Western Australia reported a significant decline in humpback whale sightings in late June [1].
This sudden drop in sightings, paired with the appearance of rare seabirds far from their usual habitats, suggests a potential ecological disruption in the Southern Ocean. Because these species rely on stable food chains, these anomalies may signal a larger environmental crisis affecting marine predator behavior.
Observations indicated that humpback whale sightings fell about 60% below normal levels [1]. This decline occurred in the coastal waters of southwest Western Australia, where these whales are typically seen during their migration patterns.
Simultaneously, rare seabirds have begun appearing on Australia’s east coast. These birds were found thousands of kilometers away from their expected locations, and many appeared weakened [2].
Researchers are investigating a possible link to a smaller version of the ‘Blob’ [3]. The Blob refers to a marine heatwave in the Southern Ocean that can disrupt the feeding behavior of marine predators by altering the availability of prey.
Such heatwaves change water temperatures and nutrient levels, which can force animals to travel vast distances in search of food or lead to starvation. The presence of weakened birds on the east coast suggests that the disruption in the Southern Ocean is severe enough to impact species across the continent.
“humpback whale sightings fell about 60% below normal”
The simultaneous decline of humpback whales and the displacement of seabirds point to a systemic failure in the Southern Ocean's food web. If a marine heatwave is responsible, it indicates that climate-driven temperature spikes are creating 'biological deserts,' forcing apex predators to migrate erratically or suffer from malnutrition, which could lead to long-term population declines.
