Microstructure of common reef-building coral genera Acropora, Pocillopora, Goniastrea and Porites: constraints on spatial resolution in geochemical sampling

Nothdurft, Luke D.; Webb, Gregory E.

doi:10.1007/s10347-006-0090-0

Cited by 99 publications

(102 citation statements)

References 58 publications

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“…It was shown that the two ultrastructural components of coral skeleton i.e., COC and fibers, are characterized by different nanostructural organization and geochemical signatures (Benzerara et al, 2011;Cuif and Dauphin, 2005;Meibom et al, 2007;Nothdurft and Webb, 2007;Perrin, 2003;Stolarski and Mazur, 2005). Considering geochemical signatures, Meibom et al (2007) reported a depletion of Sr/Ca in COCs compared to fibers in Porites sp..…”

Section: Origin Of the Intra-skeletal Calcite: Biogenic Vs Early Diamentioning

confidence: 99%

Intra-skeletal calcite in a live-collected Porites sp.: Impact on environmental proxies and potential formation process

Lazareth

Soares-Pereira

Douville

et al. 2016

Geochimica et Cosmochimica Acta

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Geochemical proxies measured in the carbonate skeleton of tropical coral Porites sp. have commonly been used to reconstruct sea surface temperature (SST) and more recently seawater pH. Nevertheless, both reconstructed SST and pH depend on the preservation state of the skeleton, here made of aragonite; i.e., diagenetic processes and its related effects should be limited. In this study, we report on the impact of the presence of intra-skeletal calcite on the skeleton geochemistry of a live-collected Porites sp..The Porites skeleton preservation state was analyzed using X-ray diffraction and scanning electron microscopy. Sr/Ca, Mg/Ca, U/Ca, Ba/Ca, Li/Mg, and B/Ca ratios were measured at a monthly and yearly resolution using solution ICP-MS and multi-collector ICP-MS. Theδ 11 B signatures and the calcite percentages were acquired at a yearly timescale. The coral colony presents two parts, one with less than 3% calcite (referred to as "no-calcite" skeleton), the other one, corresponding to the skeleton formed during the last 4 yrs. of growth,with calcite percentages varying from 13 to 32% (referred to as "with calcite" skeleton). This intra-skeletal calcite replaces partly or completely numerouscenter of calcification (COCs). All geochemical tracers investigated are significantlyimpacted by the presence of calcite. Thereconstructed SSTdecreasesby about0.1°C per calcite-percent as inferred fromthe Sr/Ca ratio. Such impact reaches up to 0.26°C per calcite-percent for temperature deduced from the Li/Mg ratio. So, less than 5% of such intra-skeletal calcite does not prevent SST reconstructions using Sr/Ca ratio, but the percentage and type of calcite have to be determined before fine SST interpretation. Seawater pH reconstruction inferredfrom boron isotopes drop by about -0.011 pH-unit per calcitepercent. Such sensitivity to calcite presence is particularly dramatic for fine paleo-pH reconstructions. Here we suggest that after being brought to shallow waters following a cyclone, the studied coral was seasonally subjected to rainfall-related water freshening that could have mimicked a vadose environment like can be encountered on raised fossil coral reefs. Nevertheless, the process of calcite precipitation remains to be determined.

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Section: Origin Of the Intra-skeletal Calcite: Biogenic Vs Early Diamentioning

confidence: 99%

Intra-skeletal calcite in a live-collected Porites sp.: Impact on environmental proxies and potential formation process

Lazareth

Soares-Pereira

Douville

et al. 2016

Geochimica et Cosmochimica Acta

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“…This study sampled at 0.70 mm (approximately monthly) intervals using a 1.4 mm drill bit and each sample area contains $1.47 mm 2 of coral skeletal material from multiple Porites lutea corallites ($2 to 4 corallites). Nothdurft and Webb [2007] studied the microstructure and spatial variability of skeletal growth in four coral genera including Porites and they recommend caution is needed when microsampling that ''even a slight lateral divergence may invalidate the time series'' [see Nothdurft and Webb, 2007, Figure 17].…”

Section: Sampling Resolutionmentioning

confidence: 99%

Reconstructing twentieth‐century sea surface temperature variability in the southwest Pacific: A replication study using multiple coral Sr/Ca records from New Caledonia

2007

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[1] Coral-based climate reconstructions typically have not used multiple cores from a region to capture and replicate a climate signal largely because of concerns of coral conservation, analytical expense, and time constraints. Coral Sr/Ca reproducibility through the twentieth century was investigated using three intracolony and three intercolony coral records from the reefs offshore of Amédée Island, New Caledonia. Different sampling resolutions were examined in coral Sr/Ca (fortnightly and monthly) and d 18 O (fortnightly, monthly, and seasonally) as well as similar scale subsampling of the daily in situ sea surface temperature (SST) record. The mean coral Sr/Ca, d 18 O, and SST values do not change as a function of sampling resolution. The coral Sr/Ca signal is highly reproducible; the average absolute offset between coeval monthly Sr/Ca determinations between any two coral time series is 0.035 ± 0.026 mmol/mol (1s) ($0.65°C), which is less than twice the analytical precision of the coral Sr/Ca measurements. The stack average of the monthly coral Sr/Ca variations and monthly anomalies are significantly correlated with monthly in situ SST (1967SST ( -1992; r = À0.96 and À0.64, respectively; p < 0.05; and n = 302) and 1°grid monthly SST data product ; r = À0.95 and À0.56, respectively; p < 0.05; and n = 1198). The coral Sr/Ca-SST reconstruction exhibits interannual and decadal-timescale fluctuations that exceed those observed in the gridded SST record, which may reflect true differences between SST at a shallow reef site and those averaged over a 1°grid box or inadequacies in the methodology used to create the gridded SST product when few observations are available. A warming trend of $0.6°C is observed in the twentieth century coral Sr/Ca-SST record.

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“…In macro size axial coralite form a long rod also called as synapticulae. Contrary with massive coral that have solid structure of skeletal, branching Acropora has wider and sturdy, so this is the reason why Acroporid has faster growth rate than massive coral (Nothdurft and Webb, 2007).…”

Section: Growth Rate and Branch Of Acroporamentioning

confidence: 99%

Growth Rate of Staghorn Coral (Acropora) on Coral Garden Program at Sempu Nature Reserve Malang

Luthfi

Nurmalasari

Jauhari

2015

RJLS

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Live coral cover at Sempu Nature Reserve was decrease from 50% in 2006 to 36% in 2013. Adverse human activities such as: over-fishing, recreational activities, waste disposal, deforestation, reef mining and deforestation were suggested to be main factors for declining coral reef at this area. Restoration is defined as the act of returning an ecosystem, as nearly as possible, to its original condition. Coral on SendangBiru laid on northern area of Sempu Island. Coral garden was establish in the end of 2013. Aim of this research was to know the growth (wide, number of branches, growth rate) of staghorn coral that was transplanted on steel frame at coral garden in different depth. Staghorn coral were tied on doom shaped steel in 6 m depth. The result showed thatthe average of increasing staghorn coral's area was 56.91 cm 2 , number of branch increase was 55 and growth rate was 5.23 cm 2 /month respectively.Increase of depth will influence to decrease of sunlight intensity in water will be affected on calcification rate of coral. GR of staghorn coral in Sempu was higher than other area.

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Microstructure of common reef-building coral genera Acropora, Pocillopora, Goniastrea and Porites: constraints on spatial resolution in geochemical sampling

Cited by 99 publications

References 58 publications

Intra-skeletal calcite in a live-collected Porites sp.: Impact on environmental proxies and potential formation process

Intra-skeletal calcite in a live-collected Porites sp.: Impact on environmental proxies and potential formation process

Reconstructing twentieth‐century sea surface temperature variability in the southwest Pacific: A replication study using multiple coral Sr/Ca records from New Caledonia

Growth Rate of Staghorn Coral (Acropora) on Coral Garden Program at Sempu Nature Reserve Malang

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