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Title: Interactive effects of genotype and food quality on consumer growth rate and elemental content
Authors: Prater, Clay
Wagner, Nicole D.
Frost, Paul C.
Keywords: Daphnia
Ecological stoichiometry
G 9 E interaction
Life-history evolution
Phenotypic plasticity
Phosphorus use efficiency
Reaction norm
Issue Date: 2017
Publisher: © the Ecological Society of America. Published by Wiley
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.
Abstract: 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.
Description: This paper was published in the journal Ecology and the definitive published version is available at https://doi.org/10.1002/ecy.1795
Sponsor: This work was supported by a NSERC Discovery Grant to P. C. Frost and by OGS scholarships to C. Prater and N. D. Wagner.
Version: Published
DOI: 10.1002/ecy.1795
URI: https://dspace.lboro.ac.uk/2134/28326
Publisher Link: https://doi.org/10.1002/ecy.1795
ISSN: 0012-9658
Appears in Collections:Published Articles (Geography and Environment)

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