An experimental test of the egg-ratio method: estimated versus observed death rates

Détails

ID Serval
serval:BIB_0D96D842AEDC
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
An experimental test of the egg-ratio method: estimated versus observed death rates
Périodique
Freshwater Biology
Auteur(s)
Brett M.T., Martin L., Kawecki T.J.
ISSN
0046-5070
Statut éditorial
Publié
Date de publication
1992
Peer-reviewed
Oui
Volume
28
Numéro
2
Pages
237-248
Langue
anglais
Résumé
1. The accuracy of death-rate estimates provided by the egg-ratio method was assessed by directly measuring the real death rates of six large laboratory Daphnia populations for 40 days.
2. Of six models tested the Kawecki iterative model gave the best relationship to real death rates in terms of variance explained, bias, and fit at both 4- and 8-day sampling intervals. Although considered theoretically correct by persons familiar with the mathematics of egg-ratio models, the Edmondson-Paloheimo model gave slightly worse results in terms of bias and fit.
3. Using raw data, as opposed to smoothed data, gave the best fit between estimated and observed rates for both the Kawecki iterative and Edmondson-Paloheimo models.
4. Size-selective predation did not increase error in estimates of the death rate; however, non-steady-state dynamics were correlated with error in model estimates.
5. In general, the models gave a relatively good description of real dynamics, but they regularly produced negative death rates, and were grossly wrong for some individual estimates. The present study also gives practical suggestions on application of this technique to field populations.
Mots-clé
INSTANTANEOUS BIRTH-RATE, CLADOCERAN BIRTH, ZOOPLANKTON, POPULATIONS, MORTALITY, DAPHNIA
Web of science
Création de la notice
19/11/2007 10:28
Dernière modification de la notice
03/03/2018 13:40
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