Modelling the spatial population dynamics of the green oak leaf roller ( Tortrix viridana) using density dependent competitive interactions: Effects of herbivore mortality and varying host-plant quality
► Mortality leads to selection pressures that favour moths with higher growth rate. ► Increased population growth rate leads to higher moth abundances in subsequent years. ► Qualitative composition of a trees neighbourhood affects its moth abundance. ► The model reproduces patchy damage patterns lik...
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Veröffentlicht in: | Ecological modelling 2011-04, Vol.222 (7), p.1293-1302 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | ► Mortality leads to selection pressures that favour moths with higher growth rate. ► Increased population growth rate leads to higher moth abundances in subsequent years. ► Qualitative composition of a trees neighbourhood affects its moth abundance. ► The model reproduces patchy damage patterns like in real forests.
Cyclic population dynamics of forest insects with periods of more than two generations have been discussed in relation to a variety of extrinsic and intrinsic forces. In the present study, we employed the selection pressure of density dependent competitive interactions according to Witting's equations (
Witting, 2000) as driver for a discrete spatiotemporal model of the green oak leaf roller (
Tortrix viridana). The model was successfully parameterised to rebuild the cyclic population dynamics of an empirical data set of a 30-year leaf roller monitoring in Russia. Our analysis focussed on the role of herbivore mortality and host plant food quality, which have a significant effect on
T. viridana population dynamics. An additional egg or larvae mortality lowers population density and can lead to selection pressures that favour individuals with higher growth rate. This increased population growth rate can not only compensate the additional mortality, but also can lead to higher average moth abundances in subsequent generations. Furthermore, we analysed the effect of inter- and intraspecific variation in host plant quality on herbivore population dynamics and the spatial distribution of abundance and defoliation patterns. We found significant effects of the qualitative composition of a trees neighbourhood on the herbivore population of the respective tree. Also, the patchy damage patterns observable in reality have been reproduced by the present model. The applicability of the model approach and the putative genetic processes underlying Witting's model are discussed. |
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ISSN: | 0304-3800 1872-7026 |
DOI: | 10.1016/j.ecolmodel.2011.01.005 |