Citation: Etnoyer, P. J., G. Cochrane, E. Salgado, K. Graiff, J. Roletto, G. Williams, K. Reyna, and J. Hyland. 2014. Characterization of deep coral and sponge communities in the Gulf of the Farallones National Marine Sanctuary: Rittenburg Bank, Cochrane Bank and the Farallon Escarpment. NOAA Technical Memorandum NOS NCCOS 190. NOAA National Centers for Coastal Ocean Science, Charleston, SC. 32 pp.

Abstract: Benthic surveys were conducted in the Gulf of Farallones National Marine Sanctuary (GFNMS) aboard R/V Fulmar, October 3-11, 2012 using the large observation-class remotely operated vehicle (ROV) Beagle. The purpose of the surveys was to groundtruth mapping data collected in 2011, and to characterize the seafloor biota, particularly corals and sponges, in order to support Essential Fish Habitat designations under Magnuson-Stevens Act (MSA) and other conservation and management goals under the National Marine Sanctuaries Act (NMSA). ROV transects of uniform speed and distance (120 meters) were conducted over substrate classes predicted by ruggedness (Sappington et al. 2007) and backscatter intensity from the multibeam echosounder mapping data (Cochrane 2008). The three classes were low/soft, low/hard, and high/hard. The classes are reported here as sediment, mixed, and hard. Transects allowed quantification of organism abundance and density from oblique and down-looking video and still cameras mounted on the ROV. Sessile invertebrates 10 cm or larger were counted. A total area of 25,416 m 2 of sea floor was surveyed during 34 ROV transects. The overall goals and deep-sea coral (DSC) and sponge research priorities for GFNMS were: (1) to locate and characterize DSC and sponge habitats in priority areas; (2) to collect information to help understand the value of DSCs and sponges as reservoirs of biodiversity, or habitat for associated species, including commercially important fishes and invertebrates; (3) to assess the condition of DSC/sponge assemblages in relation to potential anthropogenic or environmental disturbances; and (4) to make this information available to support fisheries and sanctuary management needs under MSA and NMSA requirements.

This is a deliverable of DSCRTP's 2010-2012 West Coast Fieldwork Initiative.

  • Technical Report
Type: DSCRTP Supported Date: 2014
  • Pacific Council
  • Gulf of the Farallones