Feeding and growth variations affect δ 13C and δ 15N budgets during ontogeny in a lepidopteran larva - Institut d'écologie et des sciences de l'environnement de Paris Accéder directement au contenu
Pré-Publication, Document De Travail Année : 2022

Feeding and growth variations affect δ 13C and δ 15N budgets during ontogeny in a lepidopteran larva

Résumé

A bstract Isotopes are widely used in ecology to study food webs and physiology. The fractionation observed between trophic levels in nitrogen and carbon isotopes, explained by isotopes biochemical selectivity, is subject to important within-trophic level variations, leading to imprecision in trophic levels estimation. Understanding the drivers of these variations is thus important to improve the study of food webs. In this study, we characterized this variation by submitting Spodoptera littoralis larvae to a gradient of starvation levels, a factor that we hypothesized would change the trophic fractionation between individuals. The various growth rates that resulted from these starvation levels resulted in a ∼2.5‰within-trophic level variation of the trophic fractionation in both carbon and nitrogen, which is substantial compared to the 3-4‰classically associated with between-trophic levels variations.Hence starved animal sampled in natura may be ranked at a higher trophic level than they really are if food availability is not estimated. We were able to gain an understanding of the effect of growth rate on isotopes fluxes between three easy-to-measure biological materials, food, organism and its wastes (frass), giving insight into physiological processes at play but also conveying helpful information to the sampling framework of field studies.
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Dates et versions

hal-03856647 , version 1 (16-11-2022)

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Samuel Charberet, Annick Maria, David Siaussat, Isabelle Gounand, Jérôme Mathieu. Feeding and growth variations affect δ 13C and δ 15N budgets during ontogeny in a lepidopteran larva. 2022. ⟨hal-03856647⟩
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