The Palmyra Atoll National Wildlife Refuge in the Central Pacific. The inset shows sampling sites at the PANWR. Autonomous Reef Monitoring Structure (ARMS) and water samples were collected from nine coral reef sites at the Palmyra Atoll National Wildlife Refuge, Central Pacific. ARMS samples were obtained at sites marked by stars, water at sites marked by circles, and at site PAL-19 both ARMS and water samples were collected.