NDLI: Large-scale monitoring of effects of clothianidin-dressed oilseed rape seeds on pollinating insects in Northern Germany: effects on honey bees (Apis mellifera)

Content Provider	SpringerLink
Author	Rolke, Daniel Fuchs, Stefan Grünewald, Bernd Gao, Zhenglei Blenau, Wolfgang
Copyright Year	2016
Abstract	Possible effects of clothianidin seed-treated oilseed rape on honey bee colonies were investigated in a large-scale monitoring project in Northern Germany, where oilseed rape usually comprises 25–33 % of the arable land. For both reference and test sites, six study locations were selected and eight honey bee hives were placed at each location. At each site, three locations were directly adjacent to oilseed rape fields and three locations were situated 400 m away from the nearest oilseed rape field. Thus, 96 hives were exposed to fully flowering oilseed rape crops. Colony sizes and weights, the amount of honey harvested, and infection with parasites and diseases were monitored between April and September 2014. The percentage of oilseed rape pollen was determined in pollen and honey samples. After oilseed rape flowering, the hives were transferred to an extensive isolated area for post-exposure monitoring. Total numbers of adult bees and brood cells showed seasonal fluctuations, and there were no significant differences between the sites. The honey, which was extracted at the end of the exposure phase, contained 62.0–83.5 % oilseed rape pollen. Varroa destructor infestation was low during most of the course of the study but increased at the end of the study due to flumethrin resistance in the mite populations. In summary, honey bee colonies foraging in clothianidin seed-treated oilseed rape did not show any detrimental symptoms as compared to colonies foraging in clothianidin-free oilseed rape. Development of colony strength, brood success as well as honey yield and pathogen infection were not significantly affected by clothianidin seed-treatment during this study.
Starting Page	1648
Ending Page	1665
Page Count	18
File Format	PDF
ISSN	09639292
Journal	Ecotoxicology
Volume Number	25
Issue Number	9
e-ISSN	15733017
Language	English
Publisher	Springer US
Publisher Date	2016-09-19
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Colony development Field study Neonicotinoid Plant protection product Pollinator Seed-treatment Environment Ecotoxicology Ecology Environmental Management
Content Type	Text
Resource Type	Article
Subject	Health, Toxicology and Mutagenesis Management, Monitoring, Policy and Law Toxicology Medicine

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