Data for: Climatic and management-related drivers of endemic European spruce bark beetle populations in boreal forests

Climate change is already reducing carbon sequestration in Central European forests dramatically through extensive droughts and bark beetle outbreaks. Further warming may threaten the enormous carbon reservoirs in the boreal forests in northern Europe, unless disturbance risks can be reduced by adaptive forest management. The European spruce bark beetle (Ips typographus) is a major natural disturbance agent in spruce-dominated forests and can overwhelm the defences of healthy trees through pheromone-coordinated mass-attacks.
We used an extensive dataset of bark beetle trap counts to quantify how climatic and management-related factors influence bark beetle population sizes in boreal forests. Trap data was collected during a period without outbreaks and can thus identify mechanisms that drive populations towards outbreak thresholds.
The most significant predictors of bark beetle population size were volume of mature spruce, extent of newly exposed clearcut edges, temperature, and soil mo..., , , # Dataset: Climatic and management-related drivers of endemic European spruce bark beetle populations in boreal forests

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**Summary of experimental efforts underlying this dataset**

The data include counts from Ipslure® pheromone (methylbutenol, cis-verbenol, and ipsdienol) baited funnel traps, that attract the European spruce bark beetle (Ips typographus). The trapping effort was carried out in spruce dominated areas of southern Norway in the time period 2004-2021 (N = 1 731).

**Description of file structure and contents**

The csv file contains trap counts and several covariates. Some covariates (indicated below) are from three years before the corresponding trapping data, which is due to a time lag in the effect of some variables on local beetle populations.

year - year of trapping

north - trapping location latitude (decimal degrees)

east - trapping location longitude (decimal degrees)

masl - trapping ...