New publication explores how the COVID-19 anthropause reshaped coral reef ecosystems

A new study published in npj Ocean Sustainability reveals how the COVID-19 pandemic’s “anthropause”—a sudden halt in human activity—brought striking changes to coral reef ecosystems at Hanauma Bay, Hawai‘i .

With thousands of daily snorkelers suddenly absent, researchers documented clearer waters, increased presence of endangered Hawaiian monk seals, and shifts in reef fish abundance and behavior. Notably, herbivorous parrotfish—critical for controlling algae growth—grazed more actively when humans were gone, but their feeding dropped significantly once visitors returned.

The findings highlight both the resilience of reef ecosystems and the subtle but far-reaching impacts of human presence. While reef tourism brings cultural and economic value, the study underscores the importance of balancing visitor access with conservation. Limiting daily visitor numbers or designating “rest days” for reefs may help preserve vital ecological functions while still supporting sustainable tourism.

Read the full article here: COVID-19 anthropause affects coral reef ecosystems through biophysical changes.

See the University of Hawai‘i news release here: When crowds left, reefs came alive at Hanauma Bay.