Full description
Macroalgae are an important component of coral reef ecosystems. We identified the spatial patterns, environmental drivers and long-term trends of total cover of upright fleshy and calcareous coral reef inhabiting macroalgae in the Great Barrier Reef. The spatial study comprised of one-off surveys of 1257 transects at 324 sites on 163 reefs between latitude 11.0° to 23.6°S, coastal to offshore, at 0-18 m depth. The surveys were conducted between 1997 and 2008. Although not recent, the data are ecologically valuable due to their large spatial coverage along complex environmental gradients.Environmental predictors were obtained for each transect from in situ data, and from eReefs, a coupled hydrodynamic-biochemical model.
The study found that macroalgae dominated the benthos (≥50% cover) on at least one sites onf 40.4% of surveyed inshore reefs. Spatially, macroalgal cover increased steeply towards the coast, with latitude away from the equator, and towards shallow (≤3 m) depth. Environmental conditions associated with macroalgal dominance were: high tidal range, wave exposure and irradiance, and low aragonite saturation state, Secchi depth, total alkalinity and temperature. Evidence of space competition between macroalgal cover and hard coral cover was restricted to shallow inshore sites. Our extensive empirical data and relationships may serve to parameterize ecosystem models, and to optimize refine reef condition indices based on macroalgal data for Pacific coral reefs.
This dataset underpins the study: Fabricius KE, Crossman K, Jonker M, Mongin M, Thompson A . (2023) Macroalgal cover on coral reefs: spatial and environmental predictors, and decadal trends in the Great Barrier Reef. PLOS One.
We acknowledge the Traditional Owners of the Sea Country of the Great Barrier Reef, and pay our respects to their Elders past, present and emerging. We acknowledge their continuing spiritual connection to their Sea Country.
Lineage
Maintenance and Update Frequency: notPlannedNotes
CreditFabricius, KE (AIMS)
Mongin, M, CSIRO Oceans and Atmospheric Processes, Hobart TAS, Australia
Crossman, K (AIMS)
Thompson, A (AIMS)
Funding: The one-off surveys and the AIMS Long-term monitoring program were funded by core operational funding of the Australian Institute of Marine Science (AIMS; www.aims.gov.au), the desktop research was funded by the Reef Restoration and Adaptation Program (https://gbrrestoration.org/), a partnership between the Australian Governments Reef Trust and the Great Barrier Reef Foundation, and AIMS.
Additional Contributions: Mathieu Mongin, CSIRO provided the eReefs data as the environmental variables.
Jonker, MJ (AIMS)
Modified: 25 09 2026
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Source Dataset: AIMS Long-Term Monitoring Program: Video And Photo Transects (Great Barrier Reef)
doi :
https://doi.org/10.25845/5c09bc4ff315c![]()
Data Dictionary [csv file size: 6KB]
url :
https://api.aims.gov.au/data-v2.0/b2033dc8-e620-45a7-bcea-e651aa30fa51/files/Data-Dictionary.csv![]()
mdata2_2022_final csv file (size: 789 KB)
url :
https://api.aims.gov.au/data-v2.0/b2033dc8-e620-45a7-bcea-e651aa30fa51/files/mdat2_2022_final.csv![]()
Source Dataset: Surveys of Octocoral communities, benthic cover and environmental factors on coral reefs of the Great Barrier Reef
url :
https://apps.aims.gov.au/metadata/view/2b671780-4415-4c26-8926-7519b0bffce0![]()
Fabricius KE, Crossman K, Jonker M, Mongin M, Thompson A (2023) Macroalgal cover on coral reefs: Spatial and environmental predictors, and decadal trends in the Great Barrier Reef. PLOS ONE 18(1): e0279699. https://doi.org/10.1371/journal.pone.0279699
doi :
https://doi.org/10.1371/journal.pone.0279699![]()
R scripts for Macroalgal cover on coral reefs: spatial, environmental and biotic predictors, and decadal trends in the Great Barrier Reef [Software]
url :
https://github.com/open-AIMS/MA-GBR-analyses![]()
Macroalgal surveys and ereefs data [csv files size: 606KB]
global : fe9659f1-12d6-4acf-ab89-67acdd37efe5
- global : b2033dc8-e620-45a7-bcea-e651aa30fa51
