Standard Presentation (15 mins) Australian Marine Sciences Association 2022

Photogrammetry takes stock of the abundance and prevalence of common coral taxa in the GBR and Torres Strait to inform restoration interventions (#390)

Renata Ferrari 1 , Mary Wakeford 2 , Sophie E Gordon 1 , Marine Lechene 1 3 , Tiny B Remer 1 3 , Paul Muir 1 , Mariana Alvarez-Noriega 1 , Januar Harianto 4 , Sam Noonan 1 , Will F Figueira 4 , Katharina Fabricius 1
  1. Australian Institute of Marine Science, Cape Cleveland, QUEENSLAND, Australia
  2. Australian Institute of Marine Science, Perth, Western Australia, Australia
  3. Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, QLD, Australia
  4. School of Life and Environmental Sciences, The University of Sydney, Sydney, NSW, Australia

Photogrammetry, the use of images to measure objects, is now generating unprecedented information on marine ecosystems. Most coral surveys in the Great Barrier Reef (GBR) have been traditionally based on photo quadrats and transects. Photogrammetry enables surveys of much larger areas at comparable resolution and with the additional benefit of size frequency distribution and life history data. Using photogrammetry we surveyed 91 sites (each covering ~1000 m2 of reef) across different habitats and two depths on 11 regions in the GBR and the Torres Strait (TS), Australia. We produced orthomosaics with <1 mm resolution and quantified the abundance and prevalence of the most common hard coral taxa at the highest taxonomic resolution possible (species/morpho-taxa). Preliminary results show that massive Porites spp., corymbose Acropora spp. and Pocillopora damicornis are the most prevalent and abundant coral taxa across most surveyed sites. Other abundant species were Stylophora pistillata, Pocillopora verrucosa, Pachyseris speciosa, Porites cylindrica, and Lobophyllia hemprichii. Coral abundance was generally higher offshore than inshore and shallow than deep, but differences were taxa specific. Better understanding which taxa are most successful in specific habitats across regions can inform reef restoration.