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| Titel |
Potential and limitations of finite element modelling in assessing structural integrity of coralline algae under future global change |
| VerfasserIn |
L. A. Melbourne, J. Griffin, D. N. Schmidt, E. J. Rayfield |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 12, no. 19 ; Nr. 12, no. 19 (2015-10-14), S.5871-5883 |
| Datensatznummer |
250118125
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| Publikation (Nr.) |
 copernicus.org/bg-12-5871-2015.pdf |
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| Zusammenfassung |
| Coralline algae are important habitat formers found on all rocky shores.
While the impact of future ocean acidification on the physiological
performance of the species has been well studied, little research has
focused on potential changes in structural integrity in response to climate
change. A previous study using 2-D Finite Element Analysis (FEA) suggested
increased vulnerability to fracture (by wave action or boring) in algae
grown under high CO2 conditions. To assess how realistically 2-D
simplified models represent structural performance, a series of increasingly
biologically accurate 3-D FE models that represent different aspects of
coralline algal growth were developed. Simplified geometric 3-D models of the
genus Lithothamnion were compared to models created from computed tomography (CT) scan
data of the same genus. The biologically accurate model and the simplified
geometric model representing individual cells had similar average stresses
and stress distributions, emphasising the importance of the cell walls in
dissipating the stress throughout the structure. In contrast models without
the accurate representation of the cell geometry resulted in larger stress
and strain results. Our more complex 3-D model reiterated the potential of
climate change to diminish the structural integrity of the organism. This
suggests that under future environmental conditions the weakening of the
coralline algal skeleton along with increased external pressures (wave and
bioerosion) may negatively influence the ability for coralline algae to
maintain a habitat able to sustain high levels of biodiversity. |
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