About the Expedition
On January 21, 2010, scientists from the Coral Reef Ecosystem Division of the NOAA Pacific Islands Fisheries Science Center (CRED/PIFSC), along with visiting scientists from the Hawaii Division of Aquatic Resources, Scripps Institution of Oceanography, San Diego State University, the US Fish and Wildlife Service, and local agencies in American Samoa, departed on a three month expedition to Johnston Atoll, Howland and Baker Islands, American Samoa, Jarvis Island, Palmyra Atoll, and Kingman Reef aboard the NOAA Ship Hi'ialakai. This is the fifth biennial Pacific Reef Assessment and Monitoring Program (Pacific RAMP) expedition to American Samoa and the seventh to the Pacific Remote Island Areas. The expedition is sponsored by NOAA's Coral Reef Conservation Program (CRCP) and is divided into three segment sequentially led by Chief Scientists Benjamin Richards, Rusty Brainard and Jamison Gove.READ MORE...
The strategic goal of this research is to improve scientific understanding of coral reef ecosystems throughout the Pacific, and serve as the basis for improved conservation and resource management. The recent designation of the Pacific Remote Islands Marine National Monument highlights the importance of this research.
With their extremely isolated location, many of the Pacific Remote Island Areas host a vibrate marine ecosystem. Previous Pacific RAMP cruises have documented relatively high coral cover and diversity; and high densities of large-bodied reef fish including large numbers of apex predators such as Grey Reef Sharks (Carcharhinus amblyrhynchos) and Scalloped Hammerhead sharks (Sphyraena lewini). Many of these apex predators are rare near human population centers. AS in previous years, this Pacific RAMP cruise will perform a suite of standardized multi-disciplinary methods which include Rapid Ecological Assessments (REA) for fish, corals, other large invertebrates, and algae; towed-diver surveys for large-bodied fish and habitat composition; and oceanographic studies, which include the measurement of conductivity, temperature, and density of the water column (CTD casts); water sampling; and deployment of sea-surface temperature (SST), subsurface temperature recorders (STR) and acoustic doppler current profilers (ADCP). Scientists will also be deploying Ecological Acoustic Recorders (EARs) to learn about changes in the presence and activity of marine mammals, fish, crustaceans and other sound-producing marine life when researchers aren't there to record it otherwise. Autonomous reef monitoring structures (ARMS) will also be deployed as part of the CReefs project. ARMS are simple, standardized collecting structures designed to roughly mimic the structural complexity of reef habitats. They allow for the identification of small, hard-to-sample, but ecologically important cryptic invertebrates. ARMS are being utilized throughout the Pacific and globally to systematically assess spatial patterns and temporal changes of biodiversity. Use of the EARS and ARMS are an exciting addition to RAMP data collection efforts.Follow along below to learn more about where we are going, what we are seeing, and what we have found ...
Wednesday, February 10, 2010
Coral Species Diversity and Conservation Challenge in the U.S. Pacific Ocean
photographs by Russell Moffitt
The Pacific Ocean supports the largest and among the oldest habitat for coral reefs, and the United States now manages the largest array of protected coral reefs in the world. Especially during the past century, coral reefs have been increasingly threatened by the activities of mankind, but now population growth, unmanaged fishing, and climate change will pose as more severe threats to coral reefs during the next century. Stony corals and coralline algae are the main life forms responsible for the biogenic growth and maintenance of reefs worldwide, yet we are only now focusing attention of the status of threats to these principal reef builders. Most reef corals consist of thin living animal tissues over a stony skeleton, and most are colonial and dependent upon single celled plants (called zooxanthellae) that live in their tissues for growth and nutrition. As such, these factors complicate efforts to define coral species and determining which are under threat and warrant special protection.
Scientific description of corals began with Linnaeus in 1758, and for most of the following century, definition of coral species relied on dead skeletons, written descriptions, and sketches. Although this approach has been successful for higher non-colonial animals such as birds, mammals and reptiles, corals altogether lack the prominent diagnostic features of these species such as eyes, noses, beaks, limbs, heads, tails, ears, faces, consistent coloration, etc. Moreover, the English language has mostly evolved in regions lacking corals, requiring Latin derived words as the basis for describing them, further confounding the understanding of the terms by which corals are separated into different species. Since 1850, photographs accompanied the published description of coral species, but virtually all of these were of the dead, cleaned skeleton of corals, with description of living tissues still relying on artistic sketches and written descriptions. As a consequence there were many more coral species described than what actually occurred in nature due to the lack of sufficient information to distinguish them.
Over the past several decades, scuba diving and guide books with colored photographs of living corals have helped many scientists learn coral species underwater where they live. Nevertheless, the colonial nature of living coral allows many to change their growth form to better adapt to differing habitats, and there are still concerns over which coral descriptions are the real species and which are “junior synonyms” of them. Over the past half century coral taxonomists have grappled over alternative means to describe individual species including numerical taxonomy of morphological features and immunoassay techniques to distinguish closely related species. However, these have met with limited success. More recently, molecular approaches that compare the DNA of different corals are showing great promise in determining which morphologically similar species have differing genomes and which corals with differing growth forms have the same genomes. As more “markers” are discovered on genes, there should be greater success in defining coral species. However, there will still need to be a strong relationship between consistent morphological-anatomical characteristics and molecular characteristics to resolve the coral species dilemma, and determine which are in greater need of protection.