Modeling Mesophotic Coral Distributions in the Au’au Channel, Hawaii
Project Status: This project began in January, 2011 and was completed in May, 2012
We developed predictive maps of the distribution of selected hard corals living in the mesophotic zone (30-150 meters deep) in and around the Au’au Channel, Hawai’i. This work is designed to support the management plan review process currently underway at the Humpback Whale National Marine Sanctuary, and provide baseline data for future management decisions. Prior to this project, very little information existed regarding the essential fish habitat provided by these deeper hard corals.
The Humpback Whale National Marine Sanctuary (HIHWNMS) is located off the main Hawaiian Islands, and was created by Congress in 1992 to protect humpback whales and their habitat in Hawai`i. The Sanctuary is one of the world's most important humpback whale habitats, but also serves as a home to other marine life: whales, dolphins, sea turtles, marine birds, reef fish, invertebrates and mesophotic coral ecosystems (MCEs). MCEs are light-dependent coral communities that occur in the deeper part (30 – 150 m) of the photic zone in tropical and subtropical regions. Mesophotic corals play an important role in shaping the ecological communities in deeper waters because they provide habitat and refuge for many reef fish and invertebrate species. In order for the Sanctuary to shift from single species management (i.e., of humpback whales) to an ecosystem based approach, the Sanctuary needs more information about the status and functions of biotic ecosystem components, including MCEs.
What we did
We developed a spatial model with a map of mesophotic hard coral presence from 30 to 150 meters in and around the Au’au Channel, Hawai’i using readily-available bathymetry (depth), PAR (photo-synthetically active radiation), water temperature, water currents and underwater videos describing MCE presence. The MCE presence data used in this project was the result of work conducted by the Bishop Museum, Hawaii Division of Aquatic Resources, NOAA NMFS Pacific Island Fisheries Science Center and the University of Hawaii, which was funded under NCCOS’ Center for Sponsored Coastal Ocean Research’s Deep Coral Reef Ecosystem Studies Program. The predictor information (i.e., bathymetry, PAR, temperature and currents) were collected by the U.S. Geological Survey, University of Hawaii,and the National Aeronautics and Space Administration. The modeling portion of this project was funded by the HIHWNMS to support their management plan review process.
Related Region of Study: Hawaii
Primary Contacts: Chris Caldow, Bryan Costa
Science for Coastal Ecosystem Management (Seafloor Mapping, Marine Spatial Planning, Protected Species, Coral)
Related NCCOS Center: CCMA