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Comparison of .sup.13C and .sup.15N discrimination factors and turnover rates between congeneric crayfish Orconectes rusticus and O. virilis

Hydrobiologia, 2016-03, Vol.768 (1), p.51 [Peer Reviewed Journal]

COPYRIGHT 2016 Springer ;ISSN: 0018-8158 ;EISSN: 1573-5117 ;DOI: 10.1007/s10750-015-2527-3

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  • Title:
    Comparison of .sup.13C and .sup.15N discrimination factors and turnover rates between congeneric crayfish Orconectes rusticus and O. virilis
  • Author: Glon, M. G ; Larson, E. R ; Pangle, K. L
  • Subjects: Employee turnover
  • Is Part Of: Hydrobiologia, 2016-03, Vol.768 (1), p.51
  • Description: Ecological applications of stable isotope analysis are dependent on knowing consumer-diet discrimination factors (Δ) and consumer metabolic turnover rates (m). We used an 80-day laboratory experiment to test for differences in the δ.sup.13C, δ.sup.15N and m of two species of crayfish (Orconectes rusticus and O. virilis) fed one of two diets (algae wafers and bloodworms). Over the course of the experiment, the δ.sup.13C and δ.sup.15N signatures of the crayfish approached equilibrium with those of their diets. We fit our data to a growth-based model and found δ.sup.13C, δ.sup.15N, and m to be largely indistinguishable between species, except in the case of δ.sup.15N and m of crayfish on the algae diet. We thus pooled parameters to calculate Δ.sup.13C (algae diet: 1.57â° [95% confidence interval: 0.86-2.35]; bloodworm diet: 0.8â° [0.14-1.55]) and Δ.sup.15N (bloodworm diet: 1.2â° [0.32-2.11]), and used species-specific data to calculate Δ.sup.15N for the algae diet (O. rusticus: 2.54â° [2.06-3.08]; O. virilis: 3.35â° [2.53-4.51]). Our results provide values of stable isotope Δ and m for applications to crayfish, and offer a rare comparison of these values between two closely related species and to commonly used literature values.
  • Publisher: Springer
  • Language: English
  • Identifier: ISSN: 0018-8158
    EISSN: 1573-5117
    DOI: 10.1007/s10750-015-2527-3
  • Source: AUTh Library subscriptions: ProQuest Central
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