Researchers Return from 24-Day Expedition to Northwestern Hawaiian Islands

On August 24, 2012, the Reef Assessment and Monitoring Program (RAMP) returned to Ford Island aboard the NOAA Ship Hiʻialakai, signaling the end of a 24-day research expedition to Papahānaumokuākea Marine National Monument (PMNM) in the Northwestern Hawaiian Islands (NWHI).  This special place is not only the largest protected area in the United States and one of the largest in the world, but also one of the planet’s last apex predator-dominated ecosystems, its waters teeming with large schools of sharks and reef fish.

Divers conducting RAMP surveys at Gardner Pinnacles during past cruise. Credit: Jason Helyer/NOAA

The scientific party consists of staff from NOAA’s National Marine Sanctuary Program, National Marine Fisheries Service Pacific Islands Fisheries Science Center-Coral Reef Ecosystem Division, the University of Hawaiʻi, and Scripps Research Institute.  The team made four stops during their time in the Monument, visiting French Frigate Shoals, Lisianski Island, Pearl and Hermes Reef and Kure Atoll to conduct various activities, including: rapid ecological assessments (REA) of reef fish, corals, other invertebrates and algae; coral disease surveys to determine disease presence in the NWHI; a bioerosion study to determine the growth and erosion of corals in the NWHI; and ecological acoustics research using underwater recording equipment.

The Northwestern Hawaiian Islands are home to more than 7,000 marine species, including the Bluefin Trevally. Photo: James Watt

Rapid ecological assessments have been conducted in the NWHI since 2000.  Long-term monitoring of the abundance and distributions of reef fish, invertebrates, coral and algae are used to evaluate the status and trends of the health of these remote coral reef ecosystems.  These activities improve our understanding of the region’s marine systems and help us better manage the Monument.

The abundance of marine life in the NWHI can be seen in this school of Hawaiian squirrelfish at French Frigate Shoals. Photo: James Watt

This year, the team conducted 138 reef surveys across the four islands visited, recording no large coral or fish disease outbreaks, and no observations of any coral bleaching events.  Two alien species were sighted at Lisianski Island – a feather duster worm commonly found in the main Hawaiian Islands and a bryozoan (a lace-like colonial animal), both of which have been recorded in the Monument but were previously unrecorded at Lisianski.  Researchers also compiled data for a bioerosion study on corals that will help managers learn more about climate change and ocean acidification in the region.

Colorful reef fish – Pennantfish, Pyramid and Milletseed butterflyfish – school in great numbers at Rapture Reef, French Frigate Shoals. Photo: James Watt

An acoustics team deployed and retrieved several acoustic recorders throughout the Monument and found that the biological sounds made by coral reef organisms are much louder at night – at least double the intensity. The sounds were also found to generally be louder in areas where coral cover is greater, meaning that researchers and managers can potentially use passive recordings to estimate the state of a coral reef.

Sharks and other large fish are common on most reefs throughout the Northwestern Hawaiian Islands, one of the few marine ecosystems remaining on the planet still dominated by apex predators. Photo: James Watt

Regular encounters with predatory species such as sharks and Ulua are common in the NWHI as compared to the Main Hawaiian Islands.  The team saw many schools of large Ulua and sharks, including gray reef sharks, white tips, Galapagos, and one tiger shark.

Although not specifically looking for marine debris, researchers did come across some derelict fishing nets and removed them to prevent entanglement of monk seals, turtles and other marine life.

NOAA Ship Hiʻialakai. Credit: Michelle Gaither

This year’s cruise provided an important learning and training experience for marine science students, as well as outreach to schools back on land.  Five undergraduate and five graduate students from the University of Hawaiʻi, including two PhD students from the Hawaiʻi Institute of Marine Biology, and one postdoctoral student from Scripps Institute of Oceanography, participated in the expedition to do hands-on research.  In addition, staff from PMNM and the Centers for Ocean Sciences Education Excellence (COSEE) Island Earth program conducted ship-to-classroom ‘ask a scientist’ sessions via email with ten public and charter schools throughout the state.  These schools will be treated to follow up visits by one of the scientists upon conclusion of the expedition.  These interactions focus on the importance of marine sciences, the unique ecosystems in the Northwestern Hawaiian Islands, and the research conducted on the expedition.  COSEE staff also documented research activities to produce education materials and arranged two live broadcasts from the ship on the radio program Hawaii’s Tomorrow on 760 AM.

Researchers will work with partners at the NOAA Pacific Islands Fisheries Science Center to manage the RAMP data collected from the cruise, in an ongoing process to update an analyze time-series data collected over the years.  Results from various studies conducted in the Monument are reported at a Hawaiian symposium every year, which is open to the public.

To see the daily logs from the expedition on the PMNM website, visit: http://www.papahanaumokuakea.gov/education/RAMP2012.html

Papahānaumokuākea is cooperatively managed to ensure ecological integrity and achieve strong, long-term protection and perpetuation of Northwestern Hawaiian Island ecosystems, Native Hawaiian culture, and heritage resources for current and future generations.  Three co-trustees – the Department of Commerce, Department of the Interior, and State of Hawai‘i – joined by the Office of Hawaiian Affairs, protect this special place. Papahānaumokuākea Marine National Monument was inscribed as the first mixed (natural and cultural) UNESCO World Heritage Site in the United States in July 2010.  For more information, please visit www.papahanaumokuakea.gov.

2 Responses

  1. Mahalo Damon. I might not have known about this if it wasn’t for your blog. Very interesting info.

  2. Wonderful report. Mahalo for passing it along, Damon!

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