Phase transitions of natural corals monitored by ESR spectroscopy

Vongsavat, Varadee; Winotai, P.; Meejoo, Siwaporn

doi:10.1016/j.nimb.2005.07.197

Cited by 35 publications

(20 citation statements)

References 15 publications

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“…In fact, the presence of traces of paramagnetic Mn 2+ ions and free radicals in Acropora coral was recently studied using electron paramagnetic resonance (EPR). [62] The EPR results are supported by similar work on limestone and dolomite minerals. [63] These experimental studies should be supported by molecular modeling methods.…”

Section: Remarks For Future Studiessupporting

confidence: 68%

Experimental and theoretical studies on corals. I. Toward understanding the origin of color in precious red corals from Raman and IR spectroscopies and DFT calculations

Kupka

Lin

Stobiński

et al. 2009

J Raman Spectroscopy

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An attempt to explain the origin of the vivid red color in precious pink and red corals was undertaken. Raman and IR spectroscopies were applied to characterize white, pink and red corals. The position of the Raman signal near 1500 cm −1 of some corals and pearls was associated by several authors with the presence of the mixture of all-trans-polyenic pigments, containing 6-16 conjugated C C bonds or β-carotenoids. This hypothesis was examined theoretically by performing extensive B3LYP-DFT calculations of vibrational spectra of the model polyenic compounds. The B3LYP/6-311++G * * predicted positions of the dominating Raman mode depend on the number of C C units (Cn parameter) and can be accurately predicted for larger systems from a simple nonlinear fit. The DFT-predicted Raman activities of these modes are extremely sensitive to Cn, and sharply increase with the number of double bonds. This implies a presence of only -two to three polyenes differing slightly in the number of C C units as the source of color in pink and red corals.

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Section: Remarks For Future Studiessupporting

confidence: 68%

Experimental and theoretical studies on corals. I. Toward understanding the origin of color in precious red corals from Raman and IR spectroscopies and DFT calculations

Kupka

Lin

Stobiński

et al. 2009

J Raman Spectroscopy

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“…A low drying temperature was chosen to avoid phase transitions in the skeletal aragonite/calcite composition (Vongsavat et al 2006;Goffredo et al 2012b). Corallite length (L: maximum axis of the oral disk), width (W: minimum axis of the oral disk) and height (h: oral-aboral axis) were measured using calipers, and dry skeletal mass (M) was measured using a precision balance (Goffredo and Chadwick-Furman 2003).…”

Section: Methodsmentioning

confidence: 99%

Inferred calcification rate of a temperate azooxanthellate caryophylliid coral along a wide latitudinal gradient

et al. 2016

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Correlations between environmental parameters (depth temperature and solar radiation) and growth parameters (bulk skeletal density, linear extension rate and net calcification rate) of the solitary azooxanthellate coral, Caryophyllia inornata, were investigated along an 8°lati-tudinal gradient on the western Italian coasts. Net calcification rate correlated positively with both bulk skeletal density and linear extension rate, showing that C. inornata allocates calcification resources evenly to thickening the skeleton and increasing linear growth. Overall, the three growth parameters did not follow gradients in the two environmental parameters, showing a different trend compared to most studies on zooxanthellate corals. However, the results are in agreement with the only previous analysis of an azooxanthellate coral, Leptopsammia pruvoti, studied along the same latitudinal gradient. In a comparison of the response to temperature of all Mediterranean species whose growth has been investigated to date, azooxanthellate corals were more tolerant to temperature increases than zooxanthellate corals.

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“…Collected corals were dried at 508C for 4 days, and then observed under a binocular microscope to remove fragments of substratum and calcareous deposits produced by other organisms. A low drying temperature was chosen to avoid phase transitions in the skeletal aragonite/calcite composition (Vongsavat et al 2006), as this problem is being investigated using these samples in diffractometric analyses (see Goffredo et al 2012a). Polyp length (L: maximum axis of the oral disc), width (W: minimum axis of the oral disc), and height (h: oral-aboral axis) were measured using a pair of calipers, and dry skeletal mass (M) was measured using a precision balance (Goffredo et al 2002(Goffredo et al , 2007Goffredo and Chadwick-Furman 2003).…”

Section: Methodsmentioning

confidence: 99%

Latitudinal variations in biometry and population density of a Mediterranean solitary coral

Caroselli

Nanni

Levy

et al. 2015

Limnology & Oceanography

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Correlations between solar radiation, sea surface temperature (SST), biometry, and population density were assessed along a wide latitudinal gradient in the non-zooxanthellate solitary coral Caryophyllia inornata. Biometric parameters were more strongly correlated with temperature than with solar radiation as in previous studies on Mediterranean solitary corals. With increasing SST, populations were characterized by bigger polyps, and consequently by a higher percent area coverage and mass per square meter. Population abundance was not correlated with SST, similarly to the non-zooxanthellate solitary Leptopsammia pruvoti. Instead, the population density of the zooxanthellate solitary Balanophyllia europaea decreases with increasing SST. When extrapolating the relationships between biological parameters of the three species and SST, according to the projected seawater temperature increase, a higher tolerance to temperature for non-zooxanthellate species seems to be confirmed.

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Phase transitions of natural corals monitored by ESR spectroscopy

Cited by 35 publications

References 15 publications

Experimental and theoretical studies on corals. I. Toward understanding the origin of color in precious red corals from Raman and IR spectroscopies and DFT calculations

Experimental and theoretical studies on corals. I. Toward understanding the origin of color in precious red corals from Raman and IR spectroscopies and DFT calculations

Inferred calcification rate of a temperate azooxanthellate caryophylliid coral along a wide latitudinal gradient

Latitudinal variations in biometry and population density of a Mediterranean solitary coral

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