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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, more
Peer reviewed article  
Keywords
    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]
    Marine/Coastal
Author keywords
    stable isotopes; Crepidula fornicata; larvae; delta C-13; delta N-15
Authors  Top 
  • Comtet, T.
  • Riera, P., more
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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