Population Dynamics of Apparent Competition in a Host-Parasitoid Assemblage

1. The population dynamics of two moth species, Plodia interpunctella (Hubner) and Ephestia kuehniella Zeller in the presence of their shared parasitoid, Venturia canescens (Gravenhorst), were studied in well replicated time series experiments. 2. Moths were prevented from competing for resources an...

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Bibliographic Details
Published in:The Journal of animal ecology 1998-11, Vol.67 (6), p.918-929
Main Authors: Bonsall, Michael B., Hassell, Michael P.
Format: Article
Language:English
Subjects:
Animal and plant ecology
Animal, plant and microbial ecology
Animals
apparent competition
Biological and medical sciences
competitive exclusion
Demecology
dynamic monophagy
Ecological competition
Ecology
Ephestia kuehniella
Fundamental and applied biological sciences. Psychology
hostparasitoid assemblages
Human ecology
Insect ecology
Moths
Parasite hosts
Parasitoids
Plodia interpunctella
Population dynamics
Population ecology
Protozoa. Invertebrata
Pyralidae
Species
Venturia canescens
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Summary:1. The population dynamics of two moth species, Plodia interpunctella (Hubner) and Ephestia kuehniella Zeller in the presence of their shared parasitoid, Venturia canescens (Gravenhorst), were studied in well replicated time series experiments. 2. Moths were prevented from competing for resources and could therefore only interact via the shared parasitoid. This study examines the consequences of apparent competition on the population dynamics of a simple laboratory insect assemblage. 3. Ephestia kuehniella suffers severely in the presence of the shared parasitoid. In all eight replicates, this moth species is eliminated. Time series analysis reveals that the E. kuehniella populations show divergent oscillations. 4. Plodia interpunctella and V. canescens populations show persistent populations. Time series analysis reveals that there is a delayed density dependence acting on these populations and the dynamics are either stable equilibrium or damped oscillations. 5. Repeated-measures analysis of the strength of the indirect interaction reveals that the effects of apparent competition before E. kuehniella is lost are amensal. The indirect interaction between E. kuehniella and P. interpunctella is [-, 0] rather than [-, -].
ISSN:0021-8790
1365-2656
DOI:10.1046/j.1365-2656.1998.6760918.x