A dietary polyunsaturated fatty acid improves consumer performance during challenge with an opportunistic bacterial pathogen.

Abstract:

:A dietary deficiency in polyunsaturated fatty acids (PUFAs) and/or sterols can severely constrain growth and reproduction of invertebrate consumers. Single nutrients are potentially assigned to different physiological processes, for example to support defence mechanisms; therefore, lipid requirements of healthy and pathogen-challenged consumers might differ. In an oral exposure experiment, we explored the effects of dietary PUFAs and cholesterol on growth, reproduction and survival of an aquatic key herbivore (Daphnia magna) exposed to an opportunistic pathogen (Pseudomonas sp.). We show that healthy and pathogen-challenged D. magna are strongly albeit differentially affected by the biochemical composition of their food sources. Supplementation of a C20 PUFA-deficient diet with arachidonic acid (ARA) resulted in increased survival and reproduction of pathogen-challenged D. magna. We propose that the observed benefit of consuming an ARA-rich diet during pathogen challenge is conveyed partially via ARA-derived eicosanoids. This study is one of the first to consider the importance of dietary PUFAs in modifying fitness parameters of pathogen-challenged invertebrate hosts. Our results suggest that dietary PUFA supply should receive increased attention in host-microorganisms interactions and invertebrate disease models to better understand and predict disease dynamics in natural populations.

journal_name

FEMS Microbiol Ecol

authors

Schlotz N,Pester M,Freese HM,Martin-Creuzburg D

doi

10.1111/1574-6941.12407

subject

Has Abstract

pub_date

2014-11-01 00:00:00

pages

467-77

issue

2

eissn

0168-6496

issn

1574-6941

journal_volume

90

pub_type

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