Spatially mismatched trophic dynamics: cyclically outbreaking geometrids and their larval parasitoids

Hagen, Snorre B.; Jepsen, Jane Uhd; Schott, Tino; Ims, Rolf A.

doi:10.1098/rsbl.2009.1002

Cited by 27 publications

(38 citation statements)

References 20 publications

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“…Thereby, our inferences about a lack of parasitoid release in invasive geometrids are most robust for A. aurantiaria. The conclusion that geometrid invasions in coastal mountain birch forest are probably not facilitated by larval parasitoid release corresponds with recent findings of Hagen et al (2010) and Schott et al (2010), namely that geometrid population cycles in this system are unlikely to be driven by larval parasitoids.…”

Section: Discussionsupporting

confidence: 68%

How rapidly do invasive birch forest geometrids recruit larval parasitoids? Insights from comparison with a sympatric native geometrid

et al. 2013

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Two related issues in studies of biological invasions are how quickly the enemy complexes of invasive species become as species-rich and efficient as those of native species and how important enemy release is for the establishment and spread of invaders. We addressed these issues for the geometrid moths Operophtera brumata and Agriopis aurantiaria, who invaded the coastal mountain birch forest of northern Norway by range expansion approximately a century and 15 years ago, respectively. This was done by comparing larval parasitoid species richness and prevalence among the invaders and the native geometrid Epirrita autumnata. We found that E. autumnata and O. brumata both hosted seven parasitoid species groups, whereas A. aurantiaria hosted only one.Several parasitoid groups were shared between two or more of the geometrids. Total larval parasitism rates were similar in all three geometrid species, and comparison with published studies on larval parasitism in Western Europe suggested that O. brumata and A. aurantiaria do not suffer lower parasitism rates in our study region than in their native ranges. Our results indicate that accumulation of larval parasitoids on invasive geometrids in coastal mountain birch forest may reach completion within a few decades to at least a century after the invasion, and that establishment and spread of such invaders is unlikely to be facilitated by release from larval parasitism. Our investigations also uncovered a high degree of spatiotemporal synchrony between the total larval parasitism rates of O. brumata and A. aurantiaria, suggesting that larval parasitism of different geometrid species in the study system is governed by some common external factor.

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Section: Discussionsupporting

confidence: 68%

How rapidly do invasive birch forest geometrids recruit larval parasitoids? Insights from comparison with a sympatric native geometrid

et al. 2013

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“…Potentially, the impact of BBB could be dramatic on both ecosystem processes and forest composition in many forest types throughout Eurasia. Except for the outbreaks of two geometrid moth species in the sub-arctic birch forests of Eurasia (Hagen et al, 2010), there are no other major pests on birches in the Boreal region of northern Europe that result in large-scale outbreaks comparable to 100% mortality (Miller et al, 1991;Herms, 2002;Nielsen et al, 2011). Widespread mortality of birch would also affect patterns of carbon sequestration.…”

Section: Discussionmentioning

confidence: 99%

Detection probability of forest pests in current inspection protocols – A case study of the bronze birch borer

Økland¹,

Haack

Wilhelmsen³

2012

Scandinavian Journal of Forest Research

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Increasing inter-continental trade of wood chips for biofuel represents a significant risk of introducing invasive pest species that can cause biome-scale impacts on forest ecosystems. Some potentially invasive species have the capacity to cause high tree mortality on the Eurasian continent and could cause significant impacts on biodiversity and ecosystem functions. Because eradication of established species is difficult, there is a need for scientific studies that can evaluate the reliability of current import control practices to ensure lowest possible risk of establishment of potentially harmful species. We used a stochastic simulation model and sensitivity analyses to evaluate the chance of detecting harmful pests in imported wood chips by sampling according to the current use of internationally accepted standards. As an example, we focused on the North American beetle Agrilus anxius (bronze birch borer) that can cause 100% mortality of European and Asian birch species in North America. We simulated the process from logging in North America to sampling the wood chips upon arrival in Europe. The probability of pest detection for current sampling protocols used by port inspectors was very low (B0.00005), while a 90% chance of detection may require sampling 27 million litres of wood chips per shipload.

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“…Also, in the western part ( Figure 1b), a time lag occurred between the two species (low populations) at site 11 (Lyngenfjord) 18 and was repeated one year later at site 9 (Reinøya) to the northwest 16 .…”

Section: Introductionmentioning

confidence: 92%

Discovery of continental-scale travelling waves and lagged synchrony in geometrid moth outbreaks prompt a re-evaluation of mountain birch/geometrid studies

Tenow

2013

F1000Res

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The spatio-temporal dynamics of populations of two 9-10 year cyclic-outbreaking geometrids, Operophtera brumata and Epirrita autumnata in mountain birch forests in northern Fennoscandia, have been studied since the 1970´s by a Swedish-Norwegian research team and, during the last decade, by Norwegian and Finnish research teams. Some of the early results have been challenged by the Norwegian team. To examine the base for disagreements, five of the papers published by the Norwegian team (2004-2011) are reviewed. It is found that conclusions in these papers are questionable or data could not be interpreted fully because two decisive traits in the spatio-temporal behaviour of outbreaks of the two species were not considered.

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Spatially mismatched trophic dynamics: cyclically outbreaking geometrids and their larval parasitoids

Cited by 27 publications

References 20 publications

How rapidly do invasive birch forest geometrids recruit larval parasitoids? Insights from comparison with a sympatric native geometrid

How rapidly do invasive birch forest geometrids recruit larval parasitoids? Insights from comparison with a sympatric native geometrid

Detection probability of forest pests in current inspection protocols – A case study of the bronze birch borer

Discovery of continental-scale travelling waves and lagged synchrony in geometrid moth outbreaks prompt a re-evaluation of mountain birch/geometrid studies

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