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Protists decrease in size linearly with temperature: ca. 2.5% degrees C-1

Protists decrease in size linearly with temperature: ca. 2.5% degrees C-1
Protists decrease in size linearly with temperature: ca. 2.5% degrees C-1
An inverse relationship between organism size and rearing temperature is widely observed in ectotherms (‘the temperature–size rule’, TSR). This has rarely been quantified for related taxa, and its applicability to protists also required testing. Here, we quantify the relationship between temperature and mean cell volume within the protists by a meta–analysis of published data covering marine, brackish water and freshwater autotrophs and heterotrophs. In each of 44 datasets, a linear relationship between temperature and size could not be rejected, and a negative trend was found in 32 cases (20 gave significant negative regressions, p < 0.05). By combining 65 datasets, we revealed, for each 1 °C increase, a cell–size reduction of 2.5% (95% CI of 1.7–3.3%) of the volume observed at 15 °C. The value did not differ across taxa (amoebae, ciliates, diatoms, dinoflagellates, flagellates), habitats, modes of nutrition or combinations of these. The data are consistent with two hypotheses that are capable of explaining the TSR in ectotherms generally: (i) resource, especially respiratory gas, limitation; and (ii) fitness gains from dividing earlier as population growth increases. Using the above relationship we show how changes in cell numbers with temperature can be estimated from changes in biomass and vice versa; ignoring this relationship would produce a systematic error.
0962-8452
2605-2611
Atkinson, David A.
0326b2ff-f6b8-40a3-bbc9-54e940428208
Ciotti, Benjamin J.
034551e4-d770-4cd2-80cc-b95c677938d2
Montagnes, David. J.S.
d67c3ace-4466-465f-8401-fcd51881a671
Atkinson, David A.
0326b2ff-f6b8-40a3-bbc9-54e940428208
Ciotti, Benjamin J.
034551e4-d770-4cd2-80cc-b95c677938d2
Montagnes, David. J.S.
d67c3ace-4466-465f-8401-fcd51881a671

Atkinson, David A., Ciotti, Benjamin J. and Montagnes, David. J.S. (2003) Protists decrease in size linearly with temperature: ca. 2.5% degrees C-1. Proceedings of the Royal Society B, 270 (1533), 2605-2611. (doi:10.1098/rspb.2003.2538). (PMID:14728784)

Record type: Article

Abstract

An inverse relationship between organism size and rearing temperature is widely observed in ectotherms (‘the temperature–size rule’, TSR). This has rarely been quantified for related taxa, and its applicability to protists also required testing. Here, we quantify the relationship between temperature and mean cell volume within the protists by a meta–analysis of published data covering marine, brackish water and freshwater autotrophs and heterotrophs. In each of 44 datasets, a linear relationship between temperature and size could not be rejected, and a negative trend was found in 32 cases (20 gave significant negative regressions, p < 0.05). By combining 65 datasets, we revealed, for each 1 °C increase, a cell–size reduction of 2.5% (95% CI of 1.7–3.3%) of the volume observed at 15 °C. The value did not differ across taxa (amoebae, ciliates, diatoms, dinoflagellates, flagellates), habitats, modes of nutrition or combinations of these. The data are consistent with two hypotheses that are capable of explaining the TSR in ectotherms generally: (i) resource, especially respiratory gas, limitation; and (ii) fitness gains from dividing earlier as population growth increases. Using the above relationship we show how changes in cell numbers with temperature can be estimated from changes in biomass and vice versa; ignoring this relationship would produce a systematic error.

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Published date: 22 December 2003
Organisations: Ocean and Earth Science

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Local EPrints ID: 359976
URI: https://eprints.soton.ac.uk/id/eprint/359976
ISSN: 0962-8452
PURE UUID: 23fea47a-ad27-42fb-8f91-dbb65cab13d8

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Date deposited: 19 Nov 2013 14:23
Last modified: 06 Aug 2019 18:48

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Author: David A. Atkinson
Author: Benjamin J. Ciotti
Author: David. J.S. Montagnes

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