Distribution, abundance and diversity of crustose coralline algae on the Great Barrier Reef

Coral Reefs ◽  
2015 ◽  
Vol 34 (2) ◽  
pp. 581-594 ◽  
Author(s):  
Angela J. Dean ◽  
Robert S. Steneck ◽  
Danika Tager ◽  
John M. Pandolfi
Keyword(s):  
Great Barrier Reef ◽  
Coralline Algae ◽  
Barrier Reef ◽  
Crustose Coralline Algae ◽  
Abundance And Diversity

Determining background levels and defining outbreaks of crustose coralline algae disease on the Great Barrier Reef

2013 ◽  
Vol 64 (11) ◽  
pp. 1022 ◽  
Author(s):  
I. R. Miller ◽  
M. Logan ◽  
K. A. Johns ◽  
M. J. Jonker ◽  
K. Osborne ◽  
...  
Keyword(s):  
Great Barrier Reef ◽  
Vital Role ◽  
Coralline Algae ◽  
Barrier Reef ◽  
Crustose Coralline Algae ◽  
Background Levels ◽  
White Band ◽  
High Incidence ◽  
Coral Reef Ecosystems ◽  
Anthropogenic Threats

Crustose coralline algae (CCA) play a vital role in coral-reef ecosystems and, like other marine organisms, they are vulnerable to disease. Between 2006 and 2011, incidence of two types of CCA disease was systematically recorded over a large portion of the Great Barrier Reef (GBR). The two CCA diseases that were recorded, coralline lethal orange disease and coralline white-band syndrome, were ubiquitous on the GBR, but generally at low levels comparable to those found on reefs in other parts of the Indo-Pacific. The present broad-scale study of the distribution and abundance of CCA disease on the GBR provides information on background levels of these diseases and allows regional thresholds for outbreaks to be defined. This will allow managers and researchers to focus attention on areas of high incidence of CCA disease to increase our understanding of causes and the environmental impacts of CCA disease at a time when coral reefs are under growing anthropogenic threats.

scholarly journals Associations between Benthic Cover and Habitat Complexity Metrics Obtained from 3D Reconstruction of Coral Reefs at Different Resolutions

2020 ◽  
Vol 12 (6) ◽  
pp. 1011 ◽  
Author(s):  
Atsuko Fukunaga ◽  
John H. R. Burns ◽  
Kailey H. Pascoe ◽  
Randall K. Kosaki
Keyword(s):  
Fractal Dimension ◽  
Coral Reefs ◽  
Habitat Structure ◽  
Coral Cover ◽  
Three Dimensional ◽  
Structural Complexity ◽  
Coralline Algae ◽  
Crustose Coralline Algae ◽  
Surface Areas ◽  
Abundance And Diversity

Quantifying the three-dimensional (3D) habitat structure of coral reefs is an important aspect of coral reef monitoring, as habitat architecture affects the abundance and diversity of reef organisms. Here, we used photogrammetric techniques to generate 3D reconstructions of coral reefs and examined relationships between benthic cover and various habitat metrics obtained at six different resolutions of raster cells, ranging from 1 to 32 cm. For metrics of 3D structural complexity, fractal dimension, which utilizes information on 3D surface areas obtained at different resolutions, and vector ruggedness measure (VRM) obtained at 1-, 2- or 4-cm resolution correlated well with benthic cover, with a relatively large amount of variability in these metrics being explained by the proportions of corals and crustose coralline algae. Curvature measures were, on the other hand, correlated with branching and mounding coral cover when obtained at 1-cm resolution, but the amount of variability explained by benthic cover was generally very low when obtained at all other resolutions. These results show that either fractal dimension or VRM obtained at 1-, 2- or 4-cm resolution, along with curvature obtained at 1-cm resolution, can effectively capture the 3D habitat structure provided by specific benthic organisms.

Shifts in coralline algae, macroalgae, and coral juveniles in the Great Barrier Reef associated with present‐day ocean acidification

2020 ◽  
Vol 26 (4) ◽  
pp. 2149-2160 ◽  
Author(s):  
Joy N. Smith ◽  
Mathieu Mongin ◽  
Angus Thompson ◽  
Michelle J. Jonker ◽  
Glenn De'ath ◽  
...  
Keyword(s):  
Great Barrier Reef ◽  
Ocean Acidification ◽  
Coralline Algae ◽  
Barrier Reef

Exposed limestones of the Northern Province of the Great Barrier Reef

1978 ◽  
Vol 291 (1378) ◽  
pp. 119-138 ◽  
Keyword(s):  
Great Barrier Reef ◽  
Phosphate Rock ◽  
Thin Layers ◽  
Coralline Algae ◽  
Northern Province ◽  
Barrier Reef ◽  
Inner Shelf ◽  
Beach Rock

The exposed reef limestones occur principally on the inner-shelf reefs and can be separated into two groups — organically cemented (reef-rock) and inorganically cemented (beach-rock, rampart-rock, boulder-rock and phosphate-rock). No examples were found of exposed sub tidal reef framework; the reef-rock exposed is entirely of intertidal origin resulting from incipient encrustration by intertidal corals and coralline algae. Most of the beach-rock, rampart-rock and boulder-rock exposures are intertidal and many show vadose cement fabrics. The cements, chiefly aragonite needles in beach-rock and cryptocrystalline high Mg calcite in ram part and boulderrocks, are thought to be derived from seawater, though the environments of precipitation on windward sides of reefs where rampart-rocks form are quite different from those on the leeward sides where beach-rocks form. Phosphate-rock develops supratidally on the surface of some sand cays. Solutions derived from guano precipitate thin layers of phosphatic cement which bring about the centripetal replacement of carbonate grains.

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