Pesticide levels previously thought to be safe for pollinators may prove harmful to wild bee health, according to research published in Pest Management Science this month.
The Canadian study shows that adult bumble bees exposed to the pesticide spinosad during larval development – at levels they could encounter in the environment – have impaired foraging ability. Bees are important pollinators of crops. In developed countries, approximately a third of human food is reliant on pollinating activity. Wild bees are thought to contribute significantly to this quantity. But although many pesticides are known to be toxic to bees, toxicity testing is largely restricted to direct lethal effects on adult honey bees, if tested on bees at all.
The researchers say sub-lethal effects on honey bees could be going unnoticed, and that different bee species could be also be affected. Dr Lora Morandin and colleagues at Canada’s Simon Fraser University tested the effects of different levels of spinosad on bumble bee colony health and foraging ability. Spinosad is a natural pesticide derived from the bacteria Actinomycetes. It is used in over 30 countries including North America, Canada and the UK to combat common crop pests such as caterpillars and thrips.
Jacqueline Ali | alfa
Food for the city – from the city
03.09.2018 | Fraunhofer-Institut für Arbeitswirtschaft und Organisation IAO
How the forest copes with the summer heat
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Thin-film solar cells made of crystalline silicon are inexpensive and achieve efficiencies of a good 14 percent. However, they could do even better if their shiny surfaces reflected less light. A team led by Prof. Christiane Becker from the Helmholtz-Zentrum Berlin (HZB) has now patented a sophisticated new solution to this problem.
"It is not enough simply to bring more light into the cell," says Christiane Becker. Such surface structures can even ultimately reduce the efficiency by...
A study in the journal Bulletin of Marine Science describes a new, blood-red species of octocoral found in Panama. The species in the genus Thesea was discovered in the threatened low-light reef environment on Hannibal Bank, 60 kilometers off mainland Pacific Panama, by researchers at the Smithsonian Tropical Research Institute in Panama (STRI) and the Centro de Investigación en Ciencias del Mar y Limnología (CIMAR) at the University of Costa Rica.
Scientists established the new species, Thesea dalioi, by comparing its physical traits, such as branch thickness and the bright red colony color, with the...
Scientists have succeeded in observing the first long-distance transfer of information in a magnetic group of materials known as antiferromagnets.
An international team of researchers has mapped Nemo's genome, providing the research community with an invaluable resource to decode the response of fish to...
Graphene is considered a promising candidate for the nanoelectronics of the future. In theory, it should allow clock rates up to a thousand times faster than today’s silicon-based electronics. Scientists from the Helmholtz Zentrum Dresden-Rossendorf (HZDR) and the University of Duisburg-Essen (UDE), in cooperation with the Max Planck Institute for Polymer Research (MPI-P), have now shown for the first time that graphene can actually convert electronic signals with frequencies in the gigahertz range – which correspond to today’s clock rates – extremely efficiently into signals with several times higher frequency. The researchers present their results in the scientific journal “Nature”.
Graphene – an ultrathin material consisting of a single layer of interlinked carbon atoms – is considered a promising candidate for the nanoelectronics of the...
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