Apr 9, 2020

Body stoichiometry of heterotrophs: assessing drivers of interspecific variations in elemental composition.

BioRxiv : the Preprint Server for Biology
B. AndrieuxFranck Jabot

Abstract

Aim: To document how body stoichiometry of heterotrophs varies globally and to assess phylogenetic, trophic, habitat and body mass drivers of this interspecific variation in elemental composition, focusing on carbon (C), nitrogen (N) and phosphorus (P). Location: Worldwide. Time period: 1930 - 2018. Major taxa studied: Amphibians, fishes (Euteleosteomorpha and Otomorpha), invertebrates, mammals, microbes and sauropsids (birds and reptiles). Methods: We compiled from the scientific literature a global database of body elemental composition of heterotrophs in marine, freshwater and terrestrial realms. We used model selection and ANCOVA analyses to investigate the proportion of variance in elemental composition explained by taxonomic groups, diet, habitat and body mass. We assessed the phylogenetic signal in body stoichiometry using Blomberg's K and Pagel's lambda statistics. We assessed the phylogenetic structure of interspecific variation in body stoichiometry using mixed models with nested taxonomic levels as random factors. We finally assessed the co-variation in elemental composition using linear models. Results: Our database currently gathers 17848 independent observations on 1491 species. Body elemental composition was foun...Continue Reading

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