Sedimentary environments of the Central Region of the Great Barrier Reef of Australia

Scoffin, Terence P.; Tudhope, Alexander W.

doi:10.1007/bf00300866

Cited by 85 publications

(49 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Sediments had generally low carbonate content (20-25%) in comparison with other reef locations (85-99% for the central region of the GBR; Scoffin and Tudhope 1985;75-85% for the Gulf of Aqaba, Red Sea; Rasheed et al 2003). At One Tree Beach, the carbonate content of < 5% indicated that sediments were most likely composed of silicate sands and is in agreement with previous carbonate values reported for this location (Javier et al 2013).…”

Section: Sediment Carbon Contentsupporting

confidence: 87%

Spatial and temporal variability of seagrass at Lizard Island, Great Barrier Reef

Saunders¹,

Bayraktarov

Roelfsema

et al. 2015

Botanica Marina

View full text Add to dashboard Cite

Increasing threats to natural ecosystems from local and global stressors are reinforcing the need for baseline data on the distribution and abundance of organisms. We quantified spatial and/or temporal patterns of seagrass distribution, shoot density, leaf area index, biomass, productivity, and sediment carbon content in shallow water (0-5 m) at Lizard Island, Great Barrier Reef, Australia, in field surveys conducted in December 2011 and October 2012. Seagrass meadows were mapped using satellite imagery and field validation. A total of 18.3 ha of seagrass, composed primarily of Thalassia hemprichii and Halodule uninervis, was mapped in shallow water. This was 46% less than the area of seagrass in the same region reported in 1995, although variations in mapping methods may have influenced the magnitude of change detected. There was inter-annual variability in shoot density and length, with values for both higher in 2011 than in 2012.Seagrass properties and sediment carbon content were representative of shallow-water seagrass meadows on a mid-shelf Great Barrier Reef island. The data can be used to evaluate change, to parameterize models of the impact of anthropogenic or environmental variability on seagrass distribution and abundance, and to assess the success of management actions.

show abstract

Section: Sediment Carbon Contentsupporting

confidence: 87%

Spatial and temporal variability of seagrass at Lizard Island, Great Barrier Reef

Saunders¹,

Bayraktarov

Roelfsema

et al. 2015

Botanica Marina

View full text Add to dashboard Cite

show abstract

“…Understanding the ecological res ponse of photosymbiont-bearing benthic foraminifera to eutrophication is highly relevant because they are widely distributed throughout reef biotypes (Langer & Hottinger 2000), they are ecological indicators of water quality and they contribute significant proportions of CaCO 3 to the shallow marine sediment (Scoffin & Tudhope 1985). Slower growth rates of M. vertebralis were associated with increased summer temperatures and additional nutrient input within the nearshore region of the Whitsunday Islands.…”

Section: Discussionmentioning

confidence: 99%

Inhibited growth in the photosymbiont-bearing foraminifer Marginopora vertebralis from the nearshore Great Barrier Reef, Australia

Reymond

Uthicke²,

Pandolfi³

2011

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

“…Together with calcareous green algae, molluscs, and corals, they are important producers of reef sediments (Scoffin and Tudhope 1985). Eighty percent of global foraminiferal reef carbonate originates from larger benthic foraminifera (LBF; Langer et al 1997).…”

mentioning

confidence: 99%

Temperature‐induced stress leads to bleaching in larger benthic foraminifera hosting endosymbiotic diatoms

Schmidt

Heinz

Kučera

et al. 2011

Limnology & Oceanography

112

118

View full text Add to dashboard Cite

Physiological mechanisms of bleaching were studied on larger benthic foraminifera (LBF) hosting endosymbiotic diatoms. Amphistegina radiata, Heterostegina depressa, and Calcarina hispida were exposed to increasing temperatures in static temperature experiments (23uC to 33uC, 6 d). Photosynthetic activity (F v : F m , measured with a pulse-amplitude modulated fluorometer), chlorophyll a (a proxy for symbiont biomass), and motility (a proxy for overall fitness of the foraminifera) were reduced in specimens at 32uC to 33uC, and cytoplasm color changes associated with bleaching were observed. A 30-d flow-through experiment at three temperatures (26uC to 31uC) and three levels of inorganic nitrate concentration (0.5 to 1.4 mmol L 21 ) confirmed negative effects of temperature at 31uC for A. radiata (including growth) and H. depressa. Another Calcarina species, Calcarina mayorii, was not affected. This suggests that temperature effects are species-specific. However, elevated nutrient concentrations did not affect any of the parameters measured. Temperatures . 30uC stress the foram-diatom endosymbiosis in some LBF species, which may lead to subsequent bleaching of the host. Given that a 2-3uC increase led to rapid bleaching of most species, we propose that, similar to corals, these species are threatened by sea-surface temperature increase predicted for tropical reef waters in the near future.

show abstract

Sedimentary environments of the Central Region of the Great Barrier Reef of Australia

Cited by 85 publications

References 12 publications

Spatial and temporal variability of seagrass at Lizard Island, Great Barrier Reef

Spatial and temporal variability of seagrass at Lizard Island, Great Barrier Reef

Inhibited growth in the photosymbiont-bearing foraminifer Marginopora vertebralis from the nearshore Great Barrier Reef, Australia

Temperature‐induced stress leads to bleaching in larger benthic foraminifera hosting endosymbiotic diatoms

Contact Info

Product

Resources

About