What aspect of blue whale behavior has decreased according to a study analyzing 6 years of ocean floor data?

The study analyzing six years of ocean floor data indicates that vocalizations of blue whales have decreased. This decline in vocal activity is significant as it provides insight into the impacts of environmental changes and human activity, such as increased ocean noise from shipping and industrial activities, which could be interfering with the whales' communication. Blue whales use vocalizations for various purposes, including navigation, finding mates, and social interaction within their pods. A reduction in these vocalizations could affect their ability to thrive, as communication plays a crucial role in their social structure and behavior. Understanding this trend can help inform conservation efforts aimed at protecting blue whale populations and their habitat in the face of ongoing oceanic changes.