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Interactive effects of genotype and food quality on consumer growth rate and elemental content

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journal contribution
posted on 30.01.2018, 11:15 by Clay Prater, Nicole D. Wagner, Paul C. Frost
Consumer body stoichiometry is a key trait that links organismal physiology to population and ecosystem-level dynamics. However, as elemental composition has traditionally been considered to be constrained within a species, the ecological and evolutionary factors shaping consumer elemental composition have not been clearly resolved. To this end, we examined the causes and extent of variation in the body phosphorus (P) content and the expression of P-linked traits, mass specific growth rate (MSGR), and P use efficiency (PUE) of the keystone aquatic consumer Daphnia using lake surveys and common garden experiments. While daphnid body %P was relatively constrained in field assemblages sampled across an environmental P gradient, unique genotypes isolated from these lakes showed highly variable phenotypic responses when raised across dietary P gradients in the laboratory. Specifically, we observed substantial inter- and intra-specific variation and differences in daphnid responses within and among our study lakes. While variation in Daphnia body %P was mostly due to plastic phenotypic changes, we documented considerable genetic differences in daphnid MSGR and PUE, and relationships between MSGR and body P content were highly variable among genotypes. Overall, our study found that consumer responses to food quality may differ considerably among genotypes and that relationships between organismal life-history traits and body stoichiometry may be strongly influenced by genetic and environmental variation in natural assemblages.

Funding

This work was supported by a NSERC Discovery Grant to P. C. Frost and by OGS scholarships to C. Prater and N. D. Wagner.

History

School

  • Social Sciences

Department

  • Geography and Environment

Published in

Ecology

Volume

98

Issue

5

Pages

1399 - 1408

Citation

PRATER, C., WAGNER, N.D. and FROST, P.C., 2017. Interactive effects of genotype and food quality on consumer growth rate and elemental content. Ecology, 98(5), pp. 1399-1408.

Publisher

© the Ecological Society of America. Published by Wiley

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Acceptance date

21/02/2017

Publication date

2017

Notes

This paper was published in the journal Ecology and the definitive published version is available at https://doi.org/10.1002/ecy.1795

ISSN

0012-9658

Language

en