NDLI: A study of the δ$^{13}$C offset between chironomid larvae and their exuvial head capsules: implications for palaeoecology

Content Provider	Springer Nature Link
Author	Frossard, Victor Belle, Simon Verneaux, Valérie Millet, Laurent Magny, Michel
Copyright Year	2013
Abstract	We conducted a rearing experiment with the chironomid species Chironomus riparius to assess the relationship between the δ$^{13}$C values of chironomid larvae and the δ$^{13}$C values of their exuvial head capsules. Our experiment was also designed to study the extent of the trophic fractionation factor (Δ$^{13}$C) under different dietary conditions. Three food sources were used (Tetramin, oats and corn), covering a range in δ$^{13}$C values of 14.55 ‰. For each of the four successive instars, carbon isotope ratios were measured in larval tissues and head capsules. This approach highlighted the variability in δ$^{13}$C for both larvae and their head capsules during larval development. Once the larvae reached the 3rd instar, their δ$^{13}$C values were stabilised and did not significantly differ from their food δ$^{13}$C (Δ$^{13}$C = 0 ‰). It is probable that the variability in the δ$^{13}$C offset during larval development reflected a difference in the carbon turnover for the chironomid cuticle compared with the whole body. At the 4th instar, the δ$^{13}$C offset did not significantly differ between the three food sources and was −0.9 ± 0.2 ‰. The proposed Δ$^{13}$C and δ$^{13}$C offset values can be considered as a first step for the reconstructions of the chironomid larvae paleo-diets with the aim of deciphering the different organic carbon sources supporting chironomid larvae productions. However, the influence of the environment (e.g. temperature, oxygen), other food sources (e.g. different nutritive values) as well as taxonomy (i.e. other chironomid species) should be assessed to strengthen the robustness of these results.
Starting Page	379
Ending Page	386
Page Count	8
File Format	PDF
ISSN	09212728
Journal	Journal of Paleolimnology
Volume Number	50
Issue Number	3
e-ISSN	15730417
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-06-18
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Chironomidae Subfossil head-capsules Paleoecology Stable carbon isotopes Trophic fractionation factor Paleontology Sedimentology Climate Change Physical Geography Freshwater & Marine Ecology Geology
Content Type	Text
Resource Type	Article
Subject	Earth-Surface Processes Aquatic Science

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