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Feeding and growth variations affect δ13C and δ15N budgets during ontogeny in a lepidopteran larvause asterix (*) to get italics
Samuel M. Charberet, Annick Maria, David Siaussat, Isabelle Gounand, Jérôme MathieuPlease use the format "First name initials family name" as in "Marie S. Curie, Niels H. D. Bohr, Albert Einstein, John R. R. Tolkien, Donna T. Strickland"
<p style="text-align: justify;">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 isotopic biochemical selectivity, is subject to important within-trophic level variations, leading to imprecision in trophic level 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 <em>Spodoptera littoralis</em> larvae to a gradient of starvation levels, a factor that we hypothesized would change the trophic fractionation between individuals. The various growth rates that were induced from these starvation levels resulted in a ≈ 1-1.5‰ 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 animals sampled<em> in natura</em> may be ranked at a higher trophic level than they really are. 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.</p>, should fill this box only if you chose 'All or part of the results presented in this preprint are based on data'. URL must start with http:// or https:// should fill this box only if you chose 'Scripts were used to obtain or analyze the results'. URL must start with http:// or https:// should fill this box only if you chose 'Codes have been used in this study'. URL must start with http:// or https://
food availability, isotopic fractionation, isotopic ecoloy
NonePlease indicate the methods that may require specialised expertise during the peer review process (use a comma to separate various required expertises).
Experimental ecology, Food webs, Physiology
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2022-11-16 15:23:31
Gregor Kalinkat