Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.9/2653
Título: Crystallinity and microchemistry of Nassarius reticulatus (Caenogastropoda) statoliths : towards their structure stability and homogeneity
Autor: Oliveira, Susana Galante
Marçal, Raquel
Guimarães, Fernanda M. G.
Soares, Jorge
Lopes, José Carlos
Machado, Jorge
Barroso, Carlos
Palavras-chave: Cristalinidade
Espectroscopia Raman
Data: Mai-2014
Citação: Galante-Oliveira, Susana... [et al.] - Crystallinity and microchemistry of Nassarius reticulatus (Caenogastropoda) statoliths : towards their structure stability and homogeneity. In: Journal of Structural Biology, Vol. 186, Issue 2 (May 2014), p. 292-301
Resumo: Gastropod statoliths are spherical biocarbonates formed during their lifespan. The stability and homogeneity of these structures’ mineral matrix was characterised along their radiuses, using Nassarius reticulatus as a model. Generally, they were proved to be bimineralic. Two of the three CaCO3 crystalline polymorphs occurring in biocarbonates – aragonite and calcite – coexist along statolith radiuses, aragonite being unequivocally the most abundant phase. The presence of a diffuse organic matrix was also perceived by the detection of a weak Raman band between 2800 and 3000 cm-1 consistently observed along radiuses. Beyond the apparent stability and homogeneity, different crystalline orientations were disclosed by Raman spectroscopy. A change in the intensity pattern of the features related to the lattice and bending modes of aragonite between different radiuses give new insights for a possible spherulitic-like growth of these structures. As expected from the relative homogeneity of both mineral and organic signals, there was no pattern on the distribution of Ca, O, Na and S along radiuses. However, a higher concentration of Sr occurs in growth rings (known as winter tags), corroborating the already described negative correlation between the concentration of this element in statoliths and temperature. Despite the apparent stability and homogeneity of the matrix during its lifespan, the periodic distribution of Sr potentially influences a dissimilar incorporation of trace elements in increments and growth rings. Since gastropod statolith elemental fingerprinting was recently suggested as a new tool to monitor marine environmental changes, the pressing need for further studies on the incorporation of traces in these structures is highlighted.
URI: http://hdl.handle.net/10400.9/2653
DOI: http://dx.doi.org/10.1016/j.jsb.2014.03.023
ISSN: 1047-8477
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