Honeybees

Starting in 2012, a team led by Alex Aebi of the University of Neuchâtel, Switzerland, asked travelling colleagues, friends and relatives to bring back honey when they went abroad. In three years they amassed 198 samples from every continent except Antarctica, and tested them for neonicotinoids. They found that three-quarters of the samples contained at least one of the five neonicotinoid pesticides. Of those, nearly half contained between two and five different neonicotinoids.

Paulina Mena, an associate professor of biology, has been studying bees for over a decade, an obsession which stems from her undergraduate experiences at Universidad Catolica de Valparaiso, Chile. “I did my undergraduate degree in Chile, and decided to do bee stuff because Chile is a hot spot for bees. Bees like deserts; that is where they have diversified a bunch,” Mena said.

Henk Tennekes refers to last century’s fifties, wherein the Germans Hermann Druckrey (1904-1994) and his friend, Chemistry Nobel laureate (1939) Adolf Butenand (1903-1995), advocated in the international community for a risk-prevention policy of dose-effect research for all pesticides. They wanted to prevent irreversible effects of pesticides. On the other hand there was the French René Truhaut, who advocated for the acceptable daily intake as the risk-management strategy for pesticide allowance for practical use.

While previous research in the UK has suggested that bees do not feed on oilseed rape, a new study shows it is the most important nectar source to honeybees while it is in flower. This must now be considered in future discussions on neonicotinoid pesticides, which are widely used on oilseed rape. Matthew Pound and student collaborators from Northumbria University in the UK analysed pollen from samples of honey, which they took from different times of the year to assess the bees’ changing preferences.

Neonicotinoid pesticides pose severe threats to ecosystems worldwide, according to new information contained in an update to the world’s most comprehensive scientific review of the ecological impacts of systemic pesticides. The Task Force on Systemic Pesticides (TFSP) released the second edition of its Worldwide Integrated Assessment of the Effects of Systemic Pesticides on Biodiversity and Ecosystems today in Ottawa, Canada. It synthesizes more than 500 studies since 2014, including some industry-sponsored studies.

Worldwide occurrences of honey bee colony losses have raised concerns about bee health and the sustainability of pollination-dependent crops. While multiple causal factors have been identified, seed coating with insecticides of the neonicotinoid family has been the focus of much discussion and research. Nonetheless, few studies have investigated the impacts of these insecticides under field conditions or in commercial beekeeping operations.

Es kann keinen Zweifel mehr geben, dass das „Insektensterben“ von großer Tragweite ist, für die Landwirtschaft, für die Ökosysteme und die Biodiversität im Land, und nicht zuletzt für alle, die sich einen Frühling ohne Schmetterlinge nicht vorstellen können. Fakt ist ein Rückgang von Insekten und insektenfressenden Wirbeltieren in Deutschland. Als Hauptgrund für dieses „Verschwinden“ wird jeweils der Einsatz von systemischen Insektiziden vermutet. Diese Stoffe wirken auf das Nervensystem und somit auf den Orientierungssinn und das Verhalten von Insekten und anderen Gliedertieren.