(Phys.org/Universitaet Mainz) Caffeine is a compound present in various plant species and is known to stimulate the central nervous system of honey bees as well as humans. Some plants add caffeine to their nectar with the aim of manipulating the activity of pollinators. However, caffeine does not appear to influence the behavior of a stingless bee that is a main pollinator of coffee plants.
(Phys.org/University of Sussex) A queen honey bee might mate with ten to twenty males. But a queen of stingless bees found in tropical countries like Brazil normally only mate with one male. According to this new paper, that may be to reduce the chance of execution.
(Bloomberg) Around half a billion bees died in four of Brazil’s southern states in the year’s first months. The die-off highlights questions about the ocean of pesticides used in the country’s agriculture and whether chemicals are washing through the human food supply — even as the government considers permitting more. Most dead bees showed traces of Fipronil, a insecticide proscribed in the European Union and classified as a possible human carcinogen by the U.S. Environmental Protection Agency.
(São Paulo Research Foundation) A new study by Brazilian biologists suggests that the effect of pesticides on bees could be worse than previously thought. Even when used at a level considered nonlethal, an insecticide curtailed the lives of bees by up to 50 percent. The researchers also found that a fungicide deemed safe for bees altered the behavior of workers and made them lethargic, potentially jeopardizing the survival of the entire colony.