Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.602455
Title: Metabolism and metabolic scaling in marine invertebrates : the effects of temperature and ocean acidification
Author: Carey, Nicholas Joseph
Awarding Body: Queen's University Belfast
Current Institution: Queen's University Belfast
Date of Award: 2013
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Abstract:
Physiological responses will determine many aspects of species' ecology in a changed environment. A major factor influencing metabolism is body size, but metabolic scaling has 11istorically been considered to be an equal mechanistic 'law' in all organisms. Th is thesis instead shows metabolic scaling has a natural variability, linked to aspects of species' ecology. Additionally, it is shown to have a degree of variability within species under different abiotic conditions, this providing empirical data to support recent theory explaining variability in metabolic scaling. However, intraspecific plasticity in metabolic scaling may not be universal, and as yet unexplained aspects of taxonomy, physiology or ecology may mean scaling in some species is stable under different abiotic stressors. This thesis used an understudied, but common, group of marine molluscs, the Polyplacophora or chitons, as a model to examine metabolism and metabolic scaling under different abiotic conditions. I showed that chitons possess an unexpected diversity in metabolic patterns, indicating highly diverse lifestyles and ecology. Later work showed species respond differently to temperature, potentially determining their survival and distribution under climate change. Examining a broad size range of NE Pacific species showed they possess different metabolic scaling relationships, linked to lifestyle and ecology. Further work on the same species under different temperatures and ocean acidification conditions showed that metabolic scaling is variable not only between, but within these species, being altered under different abiotic conditions. This indicates responses are not equal within species, and bod~ size may be important in modulating responses to abiotic stressors. To determine if these patterns were observed in other taxa, echinoderms were also examined. The results confirmed metabolic scaling varies between species, but suggests plasticity in scaling within species is not universal. In these species body size does not modulate responses to abiotic stressors, and they showed a notable degree of stability in metabolic scaling under different abiotic conditions. Clearly, further research as to why intraspecific variability in scaling may differ between taxa is needed. This thesis shows that body size is an additional factor that could modulate the responses of organisms to a changed environment; how body size may be affected by, or affect responses to, climate change are vital areas for further research.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.602455  DOI: Not available
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