Minor and trace element incorporation into branching coral Acropora nobilis skeleton

Shirai, Kotaro; Kawashima, Tatsunori; Sowa, Kohki; Watanabe, Tsuyoshi; Nakamori, Toru; Takahata, Naoto; Amakawa, Hiroshi; Sano, Yuji

doi:10.1016/j.gca.2008.07.026

Cited by 49 publications

(51 citation statements)

References 46 publications

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“…They concluded that the very similar variations in the Na/Ca and Mg/Ca ratios are due to similar microscale heterogeneities of Na and Mg in the skeletons. The Bar-Matthews et al's results are further supported by Shirai et al (2008), who applied an elemental mapping technique by EPMA to a coral skeletal sample (Acropora nobilis) and observed similar heterogeneous distributions of Mg and S in the skeletal microstructure. The strong positive Na-Mg correlation hardly appears in the monthly-to-bimonthly resolved data of Oomori et al (1982) and this study.…”

Section: Indicate Results Of 5 Coral Powder Samples (Shown As Differementioning

confidence: 77%

“…It has been observed that, in coral skeletal microstructure, Mg and S are clearly concentrated around the center of calcification which has higher organic content and consists of smaller granular crystals (Allison, 1996;Cuif et al, 2003;Meibom et al, 2004Meibom et al, , 2007Shirai et al, 2005Shirai et al, , 2008Reynaud et al, 2007), though it remains unclear whether the local enrichment of Mg and S is due to LDDs or adsorption or some other factor. Some researchers have suggested that Mg and S in coral skeletons may be predominantly bound to or hosted in organic materials (e.g., Cuif et al, 2003;Finch and Allison, 2008); however there arises a question whether this "organic hypothesis" can explain the strong positive correlations between Na, S and Mg that hold good for various abiogenic marine aragonites as well as coral skeletons.…”

Section: Indicate Results Of 5 Coral Powder Samples (Shown As Differementioning

confidence: 99%

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Na/Ca variability in coral skeletons

2010

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Section: Indicate Results Of 5 Coral Powder Samples (Shown As Differementioning

confidence: 77%

Section: Indicate Results Of 5 Coral Powder Samples (Shown As Differementioning

confidence: 99%

Na/Ca variability in coral skeletons

2010

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“…17 . All data were calibrated against a natural calcite rock from Mexico, which is homogeneous for the Mg/Ca and Sr/Ca ratios 31,32 .…”

Section: Discussionmentioning

confidence: 99%

Past daily light cycle recorded in the strontium/calcium ratios of giant clam shells

et al. 2012

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The historical record of daily light cycle in tropical and subtropical regions is short. moreover, it remains difficult to extract this cycle in the past from natural archives such as biogenic marine carbonates. Here we describe the precise analysis of sr/Ca, mg/Ca, and Ba/Ca ratios in a cultivated giant clam shell, using a laterally high-resolution secondary ion mass spectrometer with 2 µm resolution. The sr/Ca ratio exhibits striking diurnal variations, reflecting the daily light cycle. A clear seasonal variation in sr/Ca is also observed in another longer set of measurements with 50 µm resolution. Light-enhanced calcification and elemental transportation processes, in giant clam and symbiotic algae, may explain these diurnal and annual variations. This opens the possibility to develop the sr/Ca ratio from a giant clam shell as an effective proxy for parameters of the daily light cycle.

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“…To improve the measurement accuracy, we applied both the He flushing technique and a stabilizer device (Tunheng & Hirata 2004). Calibration from the signal intensity to the element was performed using 4 standard materials, such as a clear calcite with known composition (Shirai et al 2008a) (Shirai et al 2008b). The standard used in each analysis was chosen depending on the elemental properties of each standard material.…”

Section: Methodsmentioning

confidence: 99%

Spatial variation in otolith elemental composition of the Pacific herring Clupea pallasii in northern Japan

Yamane¹,

Shirai²,

Nagakura³

et al. 2010

Aquat. Biol.

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In order to examine whether otolith elemental composition of Pacific herring Clupea pallasii reflected spatially specific differences in capture location, we analyzed the elemental compositions in the edge portion of each otolith, which corresponded to the period immediately prior to the capture, as an indicator of the geographic areas in which the outer otolith was deposited. We collected 7 fish groups from 5 coastal sites: Tomamae offshore, Ishikari Bay, Akkeshi Bay, Lake Furen and Miyako Bay along the Japanese coast. Six elemental ratios, Na/Ca, Mg/Ca, K/Ca, Cu/Ca, Sr/Ca and Ba/Ca, were measured in the edge areas of each otolith by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). Significant differences were shown in all mean elemental ratios of otoliths among 4 sampling groups in the 2005 year class and among 3 sampling groups in the 2006 year class. The classification accuracy with the jackknife cross-validation using quadratic discriminant function analysis ranged from 80 to 98% and 78 to 100% in the 2005 and 2006 year classes, respectively. Our findings are comparable to those in previous studies and are further evidence that otolith chemistry is a potential tool for identifying the Pacific herring groups with different habitatuse histories and migration patterns. KEY WORDS: Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) · Otolith chemistry · Pacific herring · Population structure · MovementResale or republication not permitted without written consent of the publisher Aquat Biol 10: 283-290, 2010 tuated in size (Iizuka & Morita 1991, Nagasawa 2001, which possibly affects the fluctuation of the total abundance of the species. In order to understand the population dynamics of Pacific herring, it is important to discriminate each ecologically different population and to determine the migration patterns for feeding and spawning in coastal and oceanic habitats.In previous studies, the population structure and the movements of Pacific herring were examined using artificial tags and genetics (Grant & Utter 1984, Kobayashi et al. 1990, Hay et al. 2001, Sugaya et al. 2008. Artificial tagging methods however, can only link a recaptured fish to the geographic area where it was marked. Furthermore, they are impractical for smallsize fishes because of the high rates of mortality during early life stages, and because of the requirement of a large number of tagged individuals to ensure a sufficient number of recaptures. Genetic composition can link fish to their origin populations, but not to the geographic areas where it was distributed. In Pacific herring, therefore, alternative approaches are required for studying the population structure and the movements of individual fish.To date, the chemical compositions of otoliths of teleost fishes have been analyzed to elucidate ecological questions concerning their population structure (Campana et al. 1994, Milton et al. 1997, population connectivity (Gillanders 2002), migration (Limburg 1995, Arai et al. 2004, th...

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Minor and trace element incorporation into branching coral Acropora nobilis skeleton

Cited by 49 publications

References 46 publications

Na/Ca variability in coral skeletons

Na/Ca variability in coral skeletons

Past daily light cycle recorded in the strontium/calcium ratios of giant clam shells

Spatial variation in otolith elemental composition of the Pacific herring Clupea pallasii in northern Japan

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