Abstract
Despite a growing understanding of the importance of mesophotic ecosystems, they remain relatively unexplored globally, and particularly in the Indian Ocean. The composition of benthic communities of the Ningaloo Marine Park in deeper water (> 20 m) was determined using autonomous underwater vehicles (AUVs). Environmental variables collected by the AUVs as well as geomorphological variables derived from high-resolution multibeam bathymetry were used to explain the distribution of these communities. Imagery was classified for benthic biota, and non-hierarchical k-means clustering was used to identify community groups. Overall, 12 community groups were identified which fell into three broad categories: (1) coral-dominated, (2) CCA-dominated; and (3) macroalgae- and filter-feeder-dominated. Specific deeper water communities (> 50 m) were characterised by the presence of sponges or other non-photosynthetic filter feeders. Corals were confined to depths < 40 m, and cover was high (29–40%). Generalised additive models identified the importance of substrate (cover of sand, rock, and gravel/pebbles), geomorphological variables (slope and bathymetric position index) and temperature in the distribution of communities.
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Acknowledgements
We thank our funding agency BHP Billiton-CSIRO Ningaloo Outlook Marine Research Partnership for support of this work. The views expressed herein are those of the authors and do not necessarily reflect the views of BHP Billiton or CSIRO. Thanks go to the crew of the CSIRO vessel RV Linnaeus and Karl Forcey in particular for Starbug × AUV operations. We are also grateful to the IMOS AUV facility (http://imos.org.au/facilities/auv/) and the Squidle portal (http://squidle.acfr.usyd.edu.au/) for making additional data available and Claire Rafael for analysing these images. On behalf of all authors, the corresponding author states that there is no conflict of interest.
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Figure
Hierarchical visualisation of groups (data averaged by group) and significant SIMPROF groups (red). Contribution of each species/group to the cluster identified by shading. Circles = coral-dominated, triangles = CCA-/sponge-dominated, squares = filter feeder/macroalgae-dominated (TIFF 53 kb)
338_2018_1700_MOESM3_ESM.xlsx
Detailed results of SIMPER analysis, including within-group similarity and between-group dissimilarity and contributing species (XLSX 92 kb)
Appendix
Appendix
Broad groups and combined taxa (< 1% occurrence alone)
Broad group | Combined category | Contains |
---|---|---|
Brown macroalgae | Dictyota spp. | Dictyota spp. |
Fine-branching | Fine-branching | |
Filamentous/filiform | Filamentous/filiform | |
Other | Coarse branching | |
Globose/saccate | ||
Laminate | ||
Membranous | ||
Red macroalgae | Membranous | Membranous |
Fine-branching | Fine-branching | |
Filamentous/filiform | Filamentous/filiform | |
Crustose coralline algae | Crustose coralline algae | |
Green macroalgae | All green macroalgae | Halimeda spp. |
Filamentous/filiform | ||
membranous | ||
Hard coral | Acropora spp. | Acropora spp. |
Favid spp. | Favid spp. | |
Montipora spp. | Montipora spp. | |
Porites spp. | Porites spp. | |
Cycloseris spp. | Cycloseris spp. | |
Encrusting—other | Echinophyllia/Oxypora spp. | |
Echinopora spp. | ||
Leptoseris spp. | ||
Non-Acropora spp. | ||
Foliose—other | Echinophyllia/Oxypora spp. | |
Echinopora spp. | ||
Merulina spp. | ||
Pachyseris spp. | ||
Pavona spp. | ||
Pectinia spp. | ||
Non-Acropora spp. | ||
Other | Branching: Seriatopora spp. | |
Branching: Non-Acropora spp. | ||
Massive: Galaxea spp. | ||
Massive: Lobophyllia spp. | ||
Massive: Symphyllia spp. | ||
Massive: Non-Acropora spp. | ||
Mushroom coral: Fungia spp. | ||
Submassive: Pocillopora spp. | ||
Submassive: Stylophora pistillata | ||
Submassive: Non-Acropora spp. | ||
Soft coral | Soft coral | Branching |
Lobophytum spp. | ||
Massive | ||
Non-photosynthetic filter feeders | Non-photosynthetic filter feeders | Ascidians: stalked: colonial |
Ascidians: unstalked: colonial | ||
Ascidians: unstalked: solitary | ||
Black and octocorals: branching (3D) | ||
Black and octocorals: fan (2D) | ||
Black and octocorals: Whip | ||
Bryozoa: hard: branching | ||
Bryozoa: soft | ||
Hydroids | ||
Sponges | Branching | Branching |
Encrusting | Encrusting | |
Laminar | Laminar | |
Massive | Massive | |
Other | Creeping/ramose | |
Barrels | ||
Cups | ||
Tubes and chimneys | ||
Palmate | ||
Simple | ||
Stalked | ||
Balls |
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Turner, J.A., Babcock, R.C., Hovey, R. et al. AUV-based classification of benthic communities of the Ningaloo shelf and mesophotic areas. Coral Reefs 37, 763–778 (2018). https://doi.org/10.1007/s00338-018-1700-3
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DOI: https://doi.org/10.1007/s00338-018-1700-3