Skip to Main content Skip to Navigation
Journal articles

Carbon and nitrogen asimilation by the suspensionfeding britle-star Ophiothrix fragilis from two localities in the English Chanel

Abstract : Carbon and nitrogen metabolic budgets and stable isotope analysis were used to determine the fate of the matter assimilated by the suspension-feeding brittle-star Ophiothrix fragilis in summer conditions. Metabolic budgets were established based on the experimental measurements of excretion and egestion rates and on previously published respiration and production rates. Two populations, from sites differing for the availability of macroalgae in the near shores, were investigated to test whether the assimilated matter reflected the local features of available matter. However, C:N (atomic ratio < 6) as well as delta C-13 values (as negative as -25.05 parts per thousand) of the suspended particulate matter indicated a dominance of living microalgae over detrital material at both sites. Furthermore, delta C-13 and delta N-15 values of Ophiothrix fragilis were close for the two sites (respectively -19.56 and -18.62 parts per thousand for delta C-13; 8.29 and 7.40 parts per thousand for delta N-15), supporting the hypothesis of a similar dietary composition for the two populations. Both metabolic budget and stable isotope analysis showed a discrepancy between the assimilated matter and the available matter composition. Some hypotheses are proposed to explain this discrepancy, as well as potential complementary studies needed to test for them.
Document type :
Journal articles
Complete list of metadata

https://hal.archives-ouvertes.fr/hal-01255959
Contributor : Gestionnaire Hal-Upmc <>
Submitted on : Thursday, January 14, 2016 - 10:56:58 AM
Last modification on : Monday, February 1, 2021 - 12:06:02 PM

Identifiers

  • HAL Id : hal-01255959, version 1

Citation

Aline Migné, P. Riera, M. A. Janquin, Cédric Leroux, Delphine Muths, et al.. Carbon and nitrogen asimilation by the suspensionfeding britle-star Ophiothrix fragilis from two localities in the English Chanel. Vie et Milieu / Life & Environment, Observatoire Océanologique - Laboratoire Arago, 2012, 62 (2), pp.47-53. ⟨hal-01255959⟩

Share

Metrics

Record views

200