Ancient Volcanoes in Papahānaumokuākea Marine National Monument
Returning to Papahānaumokuākea Marine National Monument (PMNM) after an expedition in 2018, our team will be conducting ROV surveys on a chain of seamounts, and document whether these underwater mountains support vibrant coral and sponge communities like others in the region.
PMNM encompasses 582,578 square miles of the Pacific Ocean, an area larger than all the United States’ national parks combined, and is one of the largest marine conservation areas in the world. As we visit Papahānaumokuākea, the wahi kūpuna of the Hawaiian people, we gratefully acknowledge generations of indigenous Hawaiians and today’s stewards of these lands and waters.
A region of PMNM that has never been explored by ROV holds promise to determine the previously unrecognized southernmost extent of the Wentworth seamounts, a small chain of Cretaceous "hotspot" or "mid-plate" volcanoes created between 66 and 145 million years ago. While mapping and diving in this area, our team will survey and map seamounts while conducting geological sampling and documenting biological communities. We will be looking for high-density coral and sponge communities as well as working to identify potentially new-to-science macro-biological specimens. Rock samples are critical to this expedition for several reasons: determining the microbe-mineral interactions and mineral content of the ferromanganese crusts, which form the outer layer of deep-sea rocks, as well as the age and mineral composition of the rocks to unlock the origins of these seamounts. Microbial communities residing on and within these crusts and rocks may provide important services to seamount ecosystems, such as a potential food source or by conducting nutrient cycling.
Understanding and protecting the natural ecosystems is a primary goal of the Monument. While the marine species from shallow waters are relatively well surveyed, the biological communities from the deeper seamounts are largely unexplored. Like shallow coral reefs, these habitats represent hot-spots of biological diversity that require a deeper understanding for future conservation and exploratory efforts.