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The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including those from the School of Psychological Sciences & Health - but also papers by researchers based within the Faculties of Science, Engineering, Humanities & Social Sciences, and from the Strathclyde Business School.

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Food degradation as a mechanism of intraspecific competition among the larvae of secondary stored product pests

Jones, A.E. and Gurney, William and Nisbet, R.M. and Gordon, D.M. (1990) Food degradation as a mechanism of intraspecific competition among the larvae of secondary stored product pests. Functional Ecology, 4 (5). pp. 629-638. ISSN 0269-8463

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Abstract

A number of investigators have shown that larval development can be affected by conditioning of the food medium resulting from the accumulation of waste products such as faeces, silk, pheromones, etc. Gordon et al. (1988) found that larvae of the stored product moth Cadra cautella (Walker) were able to continue growing even after the complete exhaustion of their food supply, an effect which the authors attributed to re-use of faecal material deposited in the conditioned medium. In this paper we develop a model describing the growth, development and survival of a cohort of stored product larvae from egg hatch to pupation. Growth and survival rates are assumed to depend only on energy uptake, which in turn depends both on the quantity and quality of the food medium. We compare the predictions of this model with the experimental observations described and modelled by Gordon et al. (1988). At low initial densities our model behaves in a way that is essentially indistinguishable both from the experimental observations and the predictions of their model. However, at high larval densities, where the Gordon et al. model fails to match observed behaviour, our model predicts survival, development times and weights at maturation closely in accord with those observed.