Show simple item record Augustinus, Benno Sun, Yan Beuchat, Carine Schaffner, Urs Müller-Schärer, Heinz
dc.coverage.spatial Europe 2019-08-13T18:19:23Z 2019-08-13T18:19:23Z 2019-08-13
dc.identifier doi:10.5061/dryad.hs0r9c4
dc.description Species distribution models can predict the suitable climatic range of a potential biological control agent (BCA), but they provide little information on the BCA's potential impact. To predict high population build-up, a pre-requisite of impact, studies are needed which assess the effect of environmental factors on vital rates of a BCA across the environmental gradient of the BCA’s suitable habitats, especially for the region where the BCA is considered for field release. We extended a published species distribution model with climate-dependent vital rates of Ophraella communa, a recently and accidentally introduced potential BCA of common ragweed, Ambrosia artemisiifolia in Europe. In field and laboratory experiments, we collected data on climate-dependent parameters assumed to be the most relevant for the population build-up of O. communa, i.e. temperature driving the number of generations per year and relative humidity (RH) determining egg hatching success. We found that O. communa concluded one generation in 334 cumulative degree days, and that egg hatching success strongly decreased from >80% to <20% when RH drops from 55% to 45% during the day. We used these values to spatially explicitly project population densities across the European range suitable for both common ragweed and the beetle and found that the present distribution of the beetle in Europe is within the range with the highest projected population growth. The highest population density of O. communa was predicted for northern Italy and parts of western Russia and western Georgia. Field observations of high impact on common ragweed with records of 80% aerial pollen reduction in the Milano area since the establishment of O. communa are in line with these predictions. The relative importance of temperature and RH on the population density of O. communa varies considerably across its suitable range in Europe. We propose that the combined statistical and mechanistic approach outlined in this paper helps to more accurately predict the potential impact of a weed BCA than a species distribution model alone. Identifying the factors limiting the population build-up of a BCA across the suitable range allows implementation of more targeted release and management strategies to optimize biocontrol efficacy.
dc.relation.haspart doi:10.5061/dryad.hs0r9c4/1
dc.relation.haspart doi:10.5061/dryad.hs0r9c4/2
dc.relation.haspart doi:10.5061/dryad.hs0r9c4/3
dc.subject bioclimatic range
dc.subject biocontrol insect
dc.subject biological invasions
dc.subject demography
dc.subject range prediction
dc.subject relative humidity
dc.subject temperature
dc.subject weed biocontrol
dc.title Data from: Predicting impact of a biocontrol agent: Integrating distribution modelling with climate-dependent vital rates
dc.type Article *
dwc.ScientificName Ophraella communa
dwc.ScientificName Ambrosia artemisiifolia
dc.contributor.correspondingAuthor Sun, Yan
prism.publicationName Ecological Applications

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Title CDD_Ophraella_communa
Downloaded 6 times
Description Calculation of cumulative degree days that Ophraella communa needs to conclude one generation.
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Title Hatching_success_Ophraella_communa
Downloaded 2 times
Description Data from a laboratory experiment to deduce relative humidity dependent egg mortality of Ophraella communa
Download Hatching_success_Ophraella_communa.xlsx (23.67 Kb)
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Title Combine_SDM_and_vital_rates
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Description R script which shows how we combined a species distribution model with vital rates
Download Combine_SDM_and_vital_rates.r (18.04 Kb)
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