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δ13C and δ15N changes after dietary shift in veliger larvae of the slipper limpet Crepidula fornicata: an experimental evidence Comtet, T.; Riera, P. (2006). δ13C and δ15N changes after dietary shift in veliger larvae of the slipper limpet Crepidula fornicata: an experimental evidence. Helgol. Mar. Res. 60(4): 281-285. http://dx.doi.org/10.1007/s10152-006-0043-6 In: Helgoland Marine Research. Springer: Berlin; Heidelberg. ISSN 1438-387X; e-ISSN 1438-3888, meer

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Trefwoorden

Developmental stages Developmental stages > Larvae Developmental stages > Larvae > Invertebrate larvae > Molluscan larvae > Veligers Diets Feeding experiments Food webs Hatching Isotopes > Nitrogen isotopes Isotopes > Stable isotopes Crepidula fornicata (Linnaeus, 1758) [WoRMS]; Isochrysis galbana Parke, 1949 [WoRMS]; Pavlova lutheri (Droop) J.C.Green, 1975 [WoRMS] ANE, France, Brittany, Morlaix Bay [Marine Regions] Marien/Kust

Author keywords

stable isotopes; Crepidula fornicata; larvae; delta C-13; delta N-15

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Auteurs		Top
Comtet, T. Riera, P., meer

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Abstract

δ13C and δ15N measurements are still poorly conducted in benthic invertebrate larvae. To assess the δ13C and δ15N changes occurring after a dietary shift, experiments were conducted on veliger larvae of Crepidula fornicata fed with two cultured microalgae (Isochrysis galbana and Pavlova lutheri) of known isotopic composition, 13C- enriched and 15N-depleted compared to the initial values of the larvae. Rapid changes in larval δ13C and δ15N were observed after the dietary shift, with an increase in δ13C and a decrease in δ15 N. After 19 days of feeding, isotopic equilibrium was still not reached, a period which is close to the duration of the pelagic life of the larvae. This implies that the isotopic composition measured in field-collected larvae might only partly reflect actual larval feeding but also the parental isotopic signature, especially during the early developmental stages. Isotopic measurements in marine invertebrate larvae should thus be interpreted cautiously. In planktonic food web investigations, the study of field-collected larvae of different size/developmental stage may reduce potential misinterpretations.

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