Roy Hendrikus Antonius van Grunsven

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Organisms have evolved under natural daily light/dark cycles for millions of years. These cycles have been disturbed as night-time darkness is increasingly replaced by artificial illumination. Investigating the physiological consequences of free-living organisms in artificially lit environments is crucial to determine whether nocturnal lighting disrupts(More)
Temperature change affects many aboveground and belowground ecosystem processes. Here we investigate the effect of a 5 degrees C temperature increase on plant-soil feedback. We compare plant species from a temperate climate region with immigrant plants that originate from warmer regions and have recently shifted their range polewards. We tested whether the(More)
Rapidly increasing levels of light pollution subject nocturnal organisms to major alterations of their habitat, the ecological consequences of which are largely unknown. Moths are well-known to be attracted to light at night, but effects of light on other aspects of moth ecology, such as larval development and life-history, remain unknown. Such effects may(More)
Artificial illumination attracts insects, but to what extent light attracts insects, depends on the spectral composition of the light. Response models have been developed to predict the attractiveness of artificial light sources. In this study we compared attraction of insects by existing light sources used for streetlights as well as newly developed(More)
Studies of wild populations have provided important insights into the effects of artificial light at night on organisms, populations and ecosystems. However, in most studies the exact amount of light at night individuals are exposed to remains unknown. Individuals can potentially control their nighttime light exposure by seeking dark spots within(More)
BACKGROUND Historically, psychotherapy has focused on the treatment of patients' verbal representations (thoughts) and has proved particularly successful in the cognitive behavioural treatment of psychosis. However, there is mounting evidence that visual representations (imagery) play an important role in the onset and maintenance of psychiatric disorders,(More)
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