Humpback whales show improved well-being during the first year of the COVID-19 pandemic

University of Queensland study showed humpback whales were less stressed during the pandemic, suggesting less human activity may have significant benefits for marine wildlife

A study conducted by the University of Queensland during the first year of the COVID-19 pandemic revealed that humpback whales migrating along Australia’s east coast exhibited signs of improved well-being. Published in the journal Marine Environment Research, the study utilized drones to collect whale fat samples near North Stradbroke Island, approximately 62 miles south of Brisbane.

This method enabled scientists to examine the body conditions and energy reserves of humpback whales (Megaptera novaeangliae) during their annual migration and breeding period. By analyzing the fat samples, researchers measured the hormonal concentrations of cortisol and testosterone to assess the stress levels of the whales.

Cortisol is a hormone produced in response to stress, and the results indicated that in 2021, the concentrations of this hormone were significantly lower compared to the previous year. This suggests a reduction in environmental stress factors between the two years.

Reducing human impact on marine ecosystems

The research team hypothesizes that the decrease in stress is due to the reduction in human activities and pollutants in the waters during the pandemic lockdown. The reduction in maritime traffic, fishing activities, and tourism contributed to creating a quieter and cleaner marine environment, enhancing the whales’ well-being.

The humpback whale is a large cetacean, weighing up to 88,000 pounds and reaching lengths of up to 65 feet. In recent years, this species has shown remarkable population recovery due to protective measures, reaching an estimated population of 70,000 individuals.

The findings of this study highlight the importance of reducing human impact on marine ecosystems to promote the health and well-being of marine species. The pandemic provided a unique opportunity to observe how the decrease in human activities, interference, and pollution can positively affect the environment.

Source: Marine Environment Research