Summary
Calcareous red algal nodules growing on mobile substrates have been sampled from 28 to 117m off Fraser Island in southern Queensland, eastern Australia. This is a subtropical, transitional area between the tropical Great Barrier Reef to the north and temperate, cooler waters to the south. Red algal nodules are the most common components in bioclastic gravels that extend from about 50 to 110 m and locally cover 40–50% of the seafloor. Variations in the overall character and floristic composition of the nodules with depth can be observed. Algal nodules comprise algal covered pebbles/cobbles and rhodoliths in depths shallower than 60 m whereas only rhodoliths occur in deeper settings. No changes in nodule shape occur but shallower algal nodules have larger mean size with higher standard deviation than the deeper ones (39.2 vs. 30.5 mm and 20.5 vs. 6.3 mm s.d.). Living and subrecent red algae in nodules shallower than 60 m are mainly Melobesioideae and peyssonneliaceans with minor Lithophylloideae and Mastophoroideae. Most plants belong to a few species of the generaPhymatolithon andLithothamnion. Below 68 m, rhodoliths are dominated by the family Sporolithaceae, melobesioids and peyssonneliaceans.Sporolithon is the main component below 80 m. Algal growth forms are mostly smooth encrusting to warty with no depth variation. Maximum plant thickness, however, decreases with increasing depth. Thallus thickness in the deeper water samples is more than three times smaller than in those from shallower waters. These data are important for understanding the paleoenvironmental context of deposition of the abundant coralline algal limestones with similar algal nodules found in the geological record.
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Lund, M., Davies, P.J. & Braga, J.C. Coralline algal nodules off Fraser Island, eastern Australia. Facies 42, 25–34 (2000). https://doi.org/10.1007/BF02562564
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DOI: https://doi.org/10.1007/BF02562564