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Will invertebrates require increasingly carbon-rich food in a warming world?

Will invertebrates require increasingly carbon-rich food in a warming world?
Will invertebrates require increasingly carbon-rich food in a warming world?
Elevated temperature causes metabolism and respiration to increase in poikilothermic organisms. We hypothesized that invertebrate consumers will therefore require increasingly carbon-rich diets in a warming environment because the increased energetic demands are primarily met using compounds rich in carbon, that is, carbohydrates and lipids. Here, we test this hypothesis using a new stoichiometric model that has carbon (C) and nitrogen (N) as currencies. Model predictions did not support the hypothesis, indicating instead that the nutritional requirements of invertebrates, at least in terms of food quality expressed as C∶N ratio, may change little, if at all, at elevated temperature. Two factors contribute to this conclusion. First, invertebrates facing limitation by nutrient elements such as N have, by default, excess C in their food that can be used to meet the increased demand for energy in a warming environment, without recourse to extra dietary C. Second, increased feeding at elevated temperature compensates for the extra demands of metabolism to the extent that, when metabolism and intake scale equally with temperature (have the same Q10), the relative requirement for dietary C and N remains unaltered. Our analysis demonstrates that future climate-driven increases in the C∶N ratios of autotroph biomass will likely exacerbate the stoichiometric mismatch between nutrient-limited invertebrate grazers and their food, with important consequences for C sequestration and nutrient cycling in ecosystems.
0003-0147
725-742
Anderson, Thomas R.
dfed062f-e747-48d3-b59e-2f5e57a8571d
Hessen, Dag O.
b6d0c129-f3d6-4256-84dd-4614d4a5869b
Boersma, Maarten
65832bdb-120e-439f-8aff-a16eddfa1705
Urabe, Jotaro
9b737b7a-a9d6-4ce8-ab30-d0b192f5dc4c
Mayor, Daniel J,
55f90e04-de18-481a-8d76-b4514087f198
Anderson, Thomas R.
dfed062f-e747-48d3-b59e-2f5e57a8571d
Hessen, Dag O.
b6d0c129-f3d6-4256-84dd-4614d4a5869b
Boersma, Maarten
65832bdb-120e-439f-8aff-a16eddfa1705
Urabe, Jotaro
9b737b7a-a9d6-4ce8-ab30-d0b192f5dc4c
Mayor, Daniel J,
55f90e04-de18-481a-8d76-b4514087f198

Anderson, Thomas R., Hessen, Dag O., Boersma, Maarten, Urabe, Jotaro and Mayor, Daniel J, (2017) Will invertebrates require increasingly carbon-rich food in a warming world? The American Naturalist, 190, (6), pp. 725-742. (doi:10.1086/694122).

Record type: Article

Abstract

Elevated temperature causes metabolism and respiration to increase in poikilothermic organisms. We hypothesized that invertebrate consumers will therefore require increasingly carbon-rich diets in a warming environment because the increased energetic demands are primarily met using compounds rich in carbon, that is, carbohydrates and lipids. Here, we test this hypothesis using a new stoichiometric model that has carbon (C) and nitrogen (N) as currencies. Model predictions did not support the hypothesis, indicating instead that the nutritional requirements of invertebrates, at least in terms of food quality expressed as C∶N ratio, may change little, if at all, at elevated temperature. Two factors contribute to this conclusion. First, invertebrates facing limitation by nutrient elements such as N have, by default, excess C in their food that can be used to meet the increased demand for energy in a warming environment, without recourse to extra dietary C. Second, increased feeding at elevated temperature compensates for the extra demands of metabolism to the extent that, when metabolism and intake scale equally with temperature (have the same Q10), the relative requirement for dietary C and N remains unaltered. Our analysis demonstrates that future climate-driven increases in the C∶N ratios of autotroph biomass will likely exacerbate the stoichiometric mismatch between nutrient-limited invertebrate grazers and their food, with important consequences for C sequestration and nutrient cycling in ecosystems.

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Accepted/In Press date: 7 June 2017
e-pub ahead of print date: 29 September 2017
Published date: 1 December 2017

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Local EPrints ID: 412177
URI: http://eprints.soton.ac.uk/id/eprint/412177
ISSN: 0003-0147
PURE UUID: aac57cfe-928a-4f50-90c5-a8933462a39a

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Date deposited: 13 Jul 2017 16:31
Last modified: 11 Jan 2018 17:30

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Author: Thomas R. Anderson
Author: Dag O. Hessen
Author: Maarten Boersma
Author: Jotaro Urabe
Author: Daniel J, Mayor

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