The Hawaii Cooperative Studies Unit (HCSU), located within the Pacific Aquaculture and Coastal Resources Center (PACRC), administers a cooperative research program between the Pacific Island Ecosystems Research Center (PIERC) of the US Geological Survey Biological Resources Discipline and The University of Hawaii at Hilo (UHH).

HCSU research projects located in Hawaii and the US-affiliated Pacific focus on the ecological, environmental and sociocultural management of natural and cultural areas and other components of Department of the Interior agencies (including National Park Service and US Fish and Wildlife Service), other natural areas in Hawaii and other similar areas in the region.

The Unit's primary focus is on the conservation of Hawaii's natural resources in protected habitats, such as national parks, wildlife refuges and the state's natural area reserves. Studies on cultural resources are also conducted, particularly where they interface with natural resource management, a not uncommon situation in Hawaii. HCSU employees also work in the National Park of American Samoa, the War in the Pacific National Historical Park in Guam, and its associated unit in Saipan. Finally, the Unit participates in and interacts with a related program of graduate and undergraduate studies at the University.

• Alien Species Removal
• Alien Yellowjackets
• Anchialine Pools
• Biocomplexity
• Feral Cats
• Forest Birds
• Global Change
• Hawaiian Ecosystems at Risk (HEAR)
• Hawaiian Hawk Population and Habitat
• Hawaiian Hoary Bats
• Invasive Ants
• Koa Community Ecology
• Maui Dry Forest Restoration
• Molecular Tools
• Mouflon Management Strategies
• Pacific Basin Information Node (PBIN)
• Palila
• Pest Management on Palmyra
• Rare Plants at HAVO
• Seabird Monitoring
• Vegetation Mapping