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Geochemical and crystallographic study of Tridacna maxima (Mollusca: Bivalve) specimens affected by the 2010-11 West Australian marine heat wave
Poster Title: Geochemical and crystallographic study of Tridacna maxima (Mollusca: Bivalve) specimens affected by the 2010-11 West Australian marine heat wave
Submitted on 19 Jun 2016
Author(s): Liza M. Roger, A.D. George, J. Shaw, R. Hart, M. Roberts, N. Evans, B. McDonald
Affiliations: School of Earth and Environment, The University of Western Australia, Centre for Microscopy, Characterisation and Analysis, The University of Western Australia. John de Laeter Centre, Curtin University.
This poster was presented at 13th International Coral Reef Symposium
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Abstract: Tridacna maxima shells are complex CaCO3 micro-laminated structures that record physiological and environmental changes during growth as sequential chemical and crystallographic variations in the shells. The organic fraction, crucial to shell integrity, is also to be considered when studying records of environmental changes. In this study we highlight the relationships between shell proteins, chemical composition, crystal morphology and crystal orientation through geochemical and crystallographic characterisation of three specimens of Tridacna maxima from Ningaloo Reef, Western Australia. This multi-modal imaging and analytical approach uses X-ray diffractometry, Raman spectroscopy, electron probe micro-analysis, laser-ablation ICP-MS and stable isotopic analysis to constrain the relationships between shell microstructure and composition and physiological and environmental changes. These specimens show evidence of scaring and survived the ‘marine heat wave’ off the Western Australian coast over the 2010-2011 summer. Water temperatures rose to unprecedented levels (more than 3°C above monthly average) causing lethal to sub-lethal effects with short- and long-term impacts on the ecosystem. Symbiotic organisms such as corals and Tridacna are known to bleach heavily under thermal stress, with coral bleaching recorded from Rottnest Island (near Perth) to Cygnet Bay (northern Kimberley region) in 2011. The nano- to micro scale effects of bleaching on Tridacna are also being investigated using a geochemical and crystallographic approach.Summary: Geochemical and crystallographic study of Tridacna maxima (Mollusca: Bivalvia) specimens affected by the 2010-11 Western Australian marine heat waveReport abuse »
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