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      Size matters: plasticity in metabolic scaling shows body-size may modulate responses to climate change.

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          Abstract

          Variability in metabolic scaling in animals, the relationship between metabolic rate ( R: ) and body mass ( M: ), has been a source of debate and controversy for decades. R: is proportional to MB: , the precise value of B: much debated, but historically considered equal in all organisms. Recent metabolic theory, however, predicts B: to vary among species with ecology and metabolic level, and may also vary within species under different abiotic conditions. Under climate change, most species will experience increased temperatures, and marine organisms will experience the additional stressor of decreased seawater pH ('ocean acidification'). Responses to these environmental changes are modulated by myriad species-specific factors. Body-size is a fundamental biological parameter, but its modulating role is relatively unexplored. Here, we show that changes to metabolic scaling reveal asymmetric responses to stressors across body-size ranges; B: is systematically decreased under increasing temperature in three grazing molluscs, indicating smaller individuals were more responsive to warming. Larger individuals were, however, more responsive to reduced seawater pH in low temperatures. These alterations to the allometry of metabolism highlight abiotic control of metabolic scaling, and indicate that responses to climate warming and ocean acidification may be modulated by body-size.

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          Author and article information

          Journal
          Biol. Lett.
          Biology letters
          The Royal Society
          1744-957X
          1744-9561
          Aug 2014
          : 10
          : 8
          Affiliations
          [1 ] Queen's University Belfast Marine Laboratory, 12-13 The Strand, Portaferry, County Down BT22 1PF, UK School of Biological Sciences, Queen's University Belfast, Lisburn Road, Belfast BT9 7BL, UK ncarey02@qub.ac.uk.
          [2 ] Queen's University Belfast Marine Laboratory, 12-13 The Strand, Portaferry, County Down BT22 1PF, UK School of Biological Sciences, Queen's University Belfast, Lisburn Road, Belfast BT9 7BL, UK.
          Article
          rsbl.2014.0408
          10.1098/rsbl.2014.0408
          4155909
          25122741

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