The physiological ecology of Daphnia II: a dynamic model of growth and reproduction

William Gurney, E. McCauley, R.M. Nisbet, W.W. Murdoch

Research output: Contribution to journalArticle

92 Citations (Scopus)

Abstract

In the preceding paper (McCauley et al. 1990) we developed a new model for the growth and fecundity of Daphnia based on a quantitative review of short-term physiological rates and energy allocation for D. pulex. In this paper, we formulate a fully dynamic version of this model and test its predictions against experimentally observed growth and fecundity schedules obtained independently under a variety of different experimental protocols. Preliminary testing falsifies two simplifying hypotheses made in our original development and we propose modifications of these hypotheses. With the aid of these modifications our model yields predictions that are in good agreement with a large body of data on the growth and fecundity schedules of individual D. pulex. Although our model contains 18 parameters, the values of the great majority are independently determined from short-term physiological measurements, leaving only two as freely adjustable @'fitting parameters.@' The target dataset, which contains four complete growth curves (@?80 observations) and 32 growth or fecundity characterizations, thus provides a stringent test of the model, and our success in matching our predictions to it provides strong evidence that measurements of short-term physiological rates can be used successfully as predictors of long-term growth and fecundity.
LanguageEnglish
Pages716-732
Number of pages17
JournalEcology
Volume71
Issue number2
Publication statusPublished - Apr 1990

Fingerprint

ecophysiology
Daphnia
dynamic models
fecundity
ecology
prediction
Pulex
Daphnia pulex
growth curve
testing
growth models
energy
rate
parameter
test

Keywords

  • physiological ecology
  • Daphnia
  • growth model

Cite this

Gurney, W., McCauley, E., Nisbet, R. M., & Murdoch, W. W. (1990). The physiological ecology of Daphnia II: a dynamic model of growth and reproduction. Ecology, 71(2), 716-732.
Gurney, William ; McCauley, E. ; Nisbet, R.M. ; Murdoch, W.W. . / The physiological ecology of Daphnia II : a dynamic model of growth and reproduction. In: Ecology. 1990 ; Vol. 71, No. 2. pp. 716-732.
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Gurney, W, McCauley, E, Nisbet, RM & Murdoch, WW 1990, 'The physiological ecology of Daphnia II: a dynamic model of growth and reproduction' Ecology, vol. 71, no. 2, pp. 716-732.

The physiological ecology of Daphnia II : a dynamic model of growth and reproduction. / Gurney, William; McCauley, E.; Nisbet, R.M.; Murdoch, W.W. .

In: Ecology, Vol. 71, No. 2, 04.1990, p. 716-732.

Research output: Contribution to journalArticle

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T1 - The physiological ecology of Daphnia II

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AB - In the preceding paper (McCauley et al. 1990) we developed a new model for the growth and fecundity of Daphnia based on a quantitative review of short-term physiological rates and energy allocation for D. pulex. In this paper, we formulate a fully dynamic version of this model and test its predictions against experimentally observed growth and fecundity schedules obtained independently under a variety of different experimental protocols. Preliminary testing falsifies two simplifying hypotheses made in our original development and we propose modifications of these hypotheses. With the aid of these modifications our model yields predictions that are in good agreement with a large body of data on the growth and fecundity schedules of individual D. pulex. Although our model contains 18 parameters, the values of the great majority are independently determined from short-term physiological measurements, leaving only two as freely adjustable @'fitting parameters.@' The target dataset, which contains four complete growth curves (@?80 observations) and 32 growth or fecundity characterizations, thus provides a stringent test of the model, and our success in matching our predictions to it provides strong evidence that measurements of short-term physiological rates can be used successfully as predictors of long-term growth and fecundity.

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