title: Analysing diet of small herbivores: the efficiency of DNA barcoding coupled with high-throughput pyrosequencing for deciphering the composition of complex plant mixtures.
abstract: BACKGROUND
  In order to understand the role of herbivores in trophic webs, it is essential to know what they feed on. Diet analysis is, however, a challenge in many small herbivores with a secretive life style. In this paper, we compare novel (high-throughput pyrosequencing) DNA barcoding technology for plant mixture with traditional microhistological method. We analysed stomach contents of two ecologically important subarctic vole species, Microtus oeconomus and Myodes rufocanus, with the two methods. DNA barcoding was conducted using the P6-loop of the chloroplast trnL (UAA) intron.
  
  
  RESULTS
  Although the identified plant taxa in the diets matched relatively well between the two methods, DNA barcoding gave by far taxonomically more detailed results. Quantitative comparison of results was difficult, mainly due to low taxonomic resolution of the microhistological method, which also in part explained discrepancies between the methods. Other discrepancies were likely due to biases mostly in the microhistological analysis.
  
  
  CONCLUSIONS
  We conclude that DNA barcoding opens up for new possibilities in the study of plant-herbivore interactions, giving a detailed and relatively unbiased picture of food utilization of herbivores.
authors.affiliation: Department of Biology, University of Tromsø, N-9037 Tromsø, Norway. eeva.soininen@uit.no.
authors.forename: Eeva M
authors.initials: EM
authors.lastname: Soininen
authors.forename: Alice
authors.initials: A
authors.lastname: Valentini
authors.forename: Eric
authors.initials: E
authors.lastname: Coissac
authors.forename: Christian
authors.initials: C
authors.lastname: Miquel
authors.forename: Ludovic
authors.initials: L
authors.lastname: Gielly
authors.forename: Christian
authors.initials: C
authors.lastname: Brochmann
authors.forename: Anne K
authors.initials: AK
authors.lastname: Brysting
authors.forename: Jørn H
authors.initials: JH
authors.lastname: Sønstebø
authors.forename: Rolf A
authors.initials: RA
authors.lastname: Ims
authors.forename: Nigel G
authors.initials: NG
authors.lastname: Yoccoz
authors.forename: Pierre
authors.initials: P
authors.lastname: Taberlet
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