Research ArticleECOLOGY

Amid fields of rubble, scars, and lost gear, signs of recovery observed on seamounts on 30- to 40-year time scales

See allHide authors and affiliations

Science Advances  07 Aug 2019:
Vol. 5, no. 8, eaaw4513
DOI: 10.1126/sciadv.aaw4513
  • Fig. 1 Map of the study area including the northwestern end of the Hawaiian Ridge and the southern portion of the ESC.

    Yellow diamonds indicate the location of Recovering seamounts. Red diamonds indicate the location of Still Trawled seamounts. Map created in QGIS v. 2.18 Las Palmas (34) using ocean bottom layer downloaded from the Natural Earth public domain database (35).

  • Fig. 2 Example images of adverse impacts of fisheries on seamount deep-sea coral communities.

    Scale bars, 10 cm. (A) AUV Sentry image of barren substrate with scars from bottom-contact gear on Yuryaku Seamount at 400 m. (B) Scleractinian reef rubble on Kammu at 600 m. (C) Gold coral stump on Kammu at 400 m. (D) Lost net with scavengers on Kammu at 400 m. (E) Lost trawl door on NW Hancock at 300 m. (F) Lost trawl net from a second location on NW Hancock at 400 m. Photo credits: (A) A. Baco-Taylor (FSU) and E. B. Roark (TAMU), NSF, AUV Sentry; (B to F) A. Baco-Taylor (FSU) and E. B. Roark (TAMU), NSF, with HURL pilots T. Kerby and M. Cremer.

  • Fig. 3 Example images of recovering assemblages on the Recovering Seamounts of NW and SE Hancock.

    Scale bars, 10 cm. (A) Down-looking AUV Sentry image of soft corals growing over historic trawl scars on NW Hancock at 300 m. (B) Image of the same type of soft coral assemblage from the submersible on SE Hancock at 400 m (scars are not as obvious using the oblique angle of the submersible camera). (C) The precious red octocoral H. laauense and the reef-forming scleractinian Enalopsammia regrowing from fragments amid a field of coral rubble on SE Hancock at 600 m. (D) H. laauense regrowing from fragments pouring out of lost fishing nets on SE Hancock Seamount at 600 m. (E) A bed of young octocorals on SE Hancock at 600 m. (F) A patch of recovering scleractinian reef on SE Hancock at 650 m. Photo credits: (A) A. Baco-Taylor (FSU) and E. B. Roark (TAMU), NSF, AUV Sentry; (B to F) A. Baco-Taylor (FSU) and E. B. Roark (TAMU), NSF, with HURL pilots T. Kerby and M. Cremer.

  • Fig. 4 Example images of recovering or remnant communities on Still Trawled seamounts.

    Scale bars, 10 cm. (A) Young colonies of the primnoid octocoral Thouarella on Kammu Seamount at 400 m. (B) Slightly older colonies of Thouarella with the antipatharian coral Bathypathes on Kammu at 500 m. (C) A young colony of H. laauense (pink colony near the center in front of the biobox) amid a bed of other octocorals on Yuryaku at 500 m. (D) A mixed bed of scleractinian and octocorals that appear to be recovering on Koko at 500 m. (E) A bed of more mature octocoral colonies with visible epifauna, amid lost fishing lines on Koko at 450 m. (F) An area of scleractinian reef on Colahan at 600 m. Photo credits: (A to F) A. Baco-Taylor (FSU) and E. B. Roark (TAMU), NSF, with HURL pilots T. Kerby and M. Cremer.

Supplementary Materials

  • Supplementary material for this article is available at http://advances.sciencemag.org/cgi/content/full/5/8/eaaw4513/DC1

    Table S1. Summary of location, trawling history, and AUV data for the sites of this study listed from the NW to SE of the lower ESC and NHR.

    Table S2. Raw data on morphotype counts per transect used for quantitative comparisons.

    Table S3. Results of two-way crossed ANOVA for quantitative comparisons among treatments and depth groups.

  • Supplementary Materials

    The PDF file includes:

    • Table S1. Summary of location, trawling history, and AUV data for the sites of this study listed from the NW to SE of the lower ESC and NHR.
    • Legend for table S2
    • Table S3. Results of two-way crossed ANOVA for quantitative comparisons among treatments and depth groups.

    Download PDF

    Other Supplementary Material for this manuscript includes the following:

    • Table S2 (Microsoft Excel format). Raw data on morphotype counts per transect used for quantitative comparisons.

    Files in this Data Supplement:

Stay Connected to Science Advances

Navigate This Article