@article{ScheinerStraussThammetal.2020,
  author    = {Scheiner, Ricarda and Strauß, Sina and Thamm, Markus and Farr{\´e}-Armengol, Gerard and Junker, Robert R.},
  title     = {The bacterium Pantoea ananatis modifies behavioral responses to sugar solutions in honeybees},
  series = {Insects},
  volume    = {11},
  journal   = {Insects},
  number    = {10},
  issn      = {2075-4450},
  doi       = {10.3390/insects11100692},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-216247},
  year      = {2020},
  abstract  = {1. Honeybees, which are among the most important pollinators globally, do not only collect pollen and nectar during foraging but may also disperse diverse microbes. Some of these can be deleterious to agricultural crops and forest trees, such as the bacterium Pantoea ananatis, an emerging pathogen in some systems. P. ananatis infections can lead to leaf blotches, die-back, bulb rot, and fruit rot. 2. We isolated P. ananatis bacteria from flowers with the aim of determining whether honeybees can sense these bacteria and if the bacteria affect behavioral responses of the bees to sugar solutions. 3. Honeybees decreased their responsiveness to different sugar solutions when these contained high concentrations of P. ananatis but were not deterred by solutions from which bacteria had been removed. This suggests that their reduced responsiveness was due to the taste of bacteria and not to the depletion of sugar in the solution or bacteria metabolites. Intriguingly, the bees appeared not to taste ecologically relevant low concentrations of bacteria. 4. Synthesis and applications. Our data suggest that honeybees may introduce P.ananatis bacteria into nectar in field-realistic densities during foraging trips and may thus affect nectar quality and plant fitness.},
  language  = {en}
}
@article{KablauBergRutschmannetal.2020,
  author    = {Kablau, Arne and Berg, Stefan and Rutschmann, Benjamin and Scheiner, Ricarda},
  title     = {Short-term hyperthermia at larval age reduces sucrose responsiveness of adult honeybees and can increase life span},
  series = {Apidologie},
  volume    = {51},
  journal   = {Apidologie},
  issn      = {0044-8435},
  doi       = {10.1007/s13592-020-00743-8},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-232462},
  pages     = {570-582},
  year      = {2020},
  abstract  = {Honeybees are very sensitive to their breeding temperature. Even slightly lower temperatures during larval development can significantly affect adult behavior. Several devices which are employed for killing the honeybee ectoparasite Varroa destructor rely on short-term hyperthermia in the honeybee hive. The device used here applies 43.7 °C for 2 h, which is highly effective in killing the mites. We study how short-term hyperthermia affects worker brood and behavior of emerging adult bees. Sucrose responsiveness was strongly reduced after treatment of larvae early or late of larval development. Hyperthermia significantly enhanced life span, particularly in bees receiving treated early in larval development. To ask whether increased life span correlated with foraging performance, we used radio frequency identification (RFID). Onset and offset of foraging behavior as well as foraging trip duration and lifetime foraging effort were unaffected by hyperthermia treatment as prepupa.},
  language  = {en}
}
@article{HesselbachSeegerSchilcheretal.2020,
  author    = {Hesselbach, Hannah and Seeger, Johannes and Schilcher, Felix and Ankenbrand, Markus and Scheiner, Ricarda},
  title     = {Chronic exposure to the pesticide flupyradifurone can lead to premature onset of foraging in honeybees Apis mellifera},
  series = {Journal of Applied Ecology},
  volume    = {57},
  journal   = {Journal of Applied Ecology},
  number    = {3},
  doi       = {10.1111/1365-2664.13555},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-212769},
  pages     = {609-618},
  year      = {2020},
  abstract  = {1.Honeybees Apis mellifera and other pollinating insects suffer from pesticides in agricultural landscapes. Flupyradifurone is the active ingredient of a novel pesticide by the name of 'Sivanto', introduced by Bayer AG (Crop Science Division, Monheim am Rhein, Germany). It is recommended against sucking insects and marketed as 'harmless' to honeybees. Flupyradifurone binds to nicotinergic acetylcholine receptors like neonicotinoids, but it has a different mode of action. So far, little is known on how sublethal flupyradifurone doses affect honeybees. 2. We chronically applied a sublethal and field-realistic concentration of flupyradifurone to test for long-term effects on flight behaviour using radio-frequency identification. We examined haematoxylin/eosin-stained brains of flupyradifurone-treated bees to investigate possible changes in brain morphology and brain damage. 3. A field-realistic flupyradifurone dose of approximately 1.0 μg/bee/day significantly increased mortality. Pesticide-treated bees initiated foraging earlier than control bees. No morphological damage in the brain was observed. 4. Synthesis and applications. The early onset of foraging induced by a chronical application of flupyradifurone could be disadvantageous for honeybee colonies, reducing the period of in-hive tasks and life expectancy of individuals. Radio-frequency identification technology is a valuable tool for studying pesticide effects on lifetime foraging behaviour of insects.},
  language  = {en}
}