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        Density-dependent dispersal may explain the mid-season crash in some aphid populations

        Author
        Mashanova, A.
        Gange, A.C.
        Jansen, V.A.A.
        Attention
        2299/10253
        Abstract
        Aphid population dynamics during the season show a characteristic pattern with rapid increase in numbers at the beginning followed by a sudden drop in the middle of the season. This pattern is usually associated with predation and/or change in food quality during the summer. By developing a mechanistic model of aphid population dynamics we show that this pattern can arise from density-dependent dispersal behaviour of aphids. The dynamics produced by the model were similar to those observed in real populations of the alder aphid (Pterocallis alni). The two mechanisms required for these oscillations to arise were the perception of density through the number of contacts with other individuals and the inter-generational transfer of information (the maternal effect). Both mechanisms are examples of delayed density-dependence and, therefore, this study adds to the evidence that delayed density-dependence might cause complex population dynamics. To reproduce the seasonal dynamics of the alder aphid with the model, the maternal effect was essential, indicating that this could be an important factor in alder aphid dynamics. According to our model, external regulations (e.g., predation and/or change in food quality) were not required to explain the highly oscillatory population dynamics of aphids during a season.
        Publication date
        2008-07-01
        Published in
        Population Ecology
        Published version
        https://doi.org/10.1007/s10144-008-0087-3
        Other links
        http://hdl.handle.net/2299/10253
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