Population Ecology (2020) 62, 372-384

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Andrew M. Liebhold, Christer Björkman, Alain Roques, Ottar N. Bjørnstad and Maartje J. Klapwijk (2020)
Outbreaking forest insect drives phase synchrony among sympatric folivores: Exploring potential mechanisms
Population Ecology 62 (4), 372-384
Abstract: We explore a common feature of insect population dynamics, interspecific synchrony, which refers to synchrony in population dynamics among sympatric populations of different species. Such synchrony can arise via several possible mechanisms, including shared environmental effects and shared trophic interactions, but distinguishing the relative importance among different mechanisms can be challenging. We analyze interannual time series of population densities of the larch budmoth, Zeiraphera griseana (Lepidoptera: Tortricidae), along with six sympatric larch-feeding folivores from a site in the European Alps 1952–1979. These species include five lepidopterans, Exapate duratella, Ptycholomoides aeriferana, Spilonota laricana, Epirrita autumnata and Teleiodes saltuum, and one hymenopteran sawfly Pristiphora laricis. We document that the highly regular oscillatory behavior (period 9–10 years) of Z. griseana populations is similarly evident in the dynamics of most of the sympatric folivores. We also find that all of the sympatric species are phase synchronized with Z. griseana populations with half of the sympatric species exhibiting nonlagged phase synchrony and three of the species exhibiting 2–5 year lags behind Z. griseana populations. We adapt a previously developed tritrophic model of Z. griseana dynamics to explore possible mechanisms responsible for observed phase synchronization. Results suggest that either shared stochastic influences (e.g., weather) or shared parasitoid impacts are likely causes of nonlagged phase synchronization. The model further indicates that observed patterns of lagged phase synchronization are most likely caused by either shared delayed induced host plant defenses or direct density-dependent effects shared with Z. griseana.
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Database assignments for author(s): Andrew M. Liebhold, Christer Björkman, Alain Roques

Research topic(s) for pests/diseases/weeds:
population dynamics/ epidemiology

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.
Zeiraphera griseana Larch (Larix) Switzerland
Epirrita autumnata Larch (Larix) Switzerland
Spilonota laricana Larch (Larix) Switzerland
Exapate duratella Larch (Larix) Switzerland
Pristiphora laricis Larch (Larix) Switzerland