Marine Biodiversity

, Volume 46, Issue 4, pp 795–808 | Cite as

Spatial patterns in the distribution of benthic assemblages across a large depth gradient in the Coral Sea, Australia

Original Paper

Abstract

The Queensland Plateau in the Coral Sea off north-eastern Australia supports numerous submerged and emergent reefs. Osprey Reef is an emergent reef at the northern tip of the plateau ~1500 m in elevation. Over such a large depth gradient, a wide range of abiotic factors (e.g., light, temperature, substratum etc.) are likely to influence benthic zonation. Despite the importance of understanding the biodiversity of Australia’s Coral Sea, there is a lack of biological information on deep-water habitats below diving depths. Here, we used a deep-water ROV transect to capture video, still photos and live samples over a depth range spanning 92 to 787 m at North Horn on Osprey Reef. Video analysis, combined with bathymetry data, was used to identify the zones of geomorphology and the benthic assemblages along the depth gradient. There were marked changes in the geomorphology and the substrate along this depth gradient which likely influence the associated benthos. Cluster analysis indicated five benthic assemblage groups, which showed clear zonation patterns and were generally predictable based on the depth and sedimentary environment. These results are the first quantitative observations to such depths and confirm that the waters of the Coral Sea support diverse benthic assemblages, ranging from shallow-water coral reefs to mesophotic coral ecosystems, to deep-water azooxanthellate corals and sponge gardens. The knowledge provided by our study can inform management plans for the Coral Sea Commonwealth Marine Reserve that incorporate the deeper reef habitats and help to minimise future damage to these marine ecosystems.

Keywords

Osprey Reef Benthic Zonation Geomorphology Mesophotic Coldwater coral Sponges 

Supplementary material

12526_2015_434_MOESM1_ESM.xls (278 kb)
Online Resource 1(XLS 278 kb)

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Copyright information

© Senckenberg Gesellschaft für Naturforschung and Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  1. 1.College of Science, Technology and EngineeringJames Cook UniversityCairnsAustralia
  2. 2.ARC Centre of Excellence for Coral Reef StudiesJames Cook UniversityTownsvilleAustralia
  3. 3.Australian Institute of Marine ScienceTownsville, MCAustralia
  4. 4.Museum für NaturkundeLeibniz-Institut für Evolutions- und BiodiversitätsforschungBerlinGermany
  5. 5.Faculty of Geosciences and GeographyUniversity of GöttingenGöttingenGermany
  6. 6.Department für Geo- und Umweltwissenschaften & GeoBio-CenterLudwig-Maximilians-Universität MünchenMunichGermany

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