Martina Triltsch



+49-(0)6171-212 78
+49-(0)69-798421 09



Cholinerge synaptische Übertragung im olfaktorischen System der Honigbiene und Auswirkungen von Insektiziden

Neonicotinoid insecticides act as agonists of the insect nicotinic acetylcholine receptor. Applications of sublethal insecticide doses lead to various motor abnormalities in honeybees. Here, we investigated the effects of clothianidin, imidacloprid, or thiacloprid on the motor activity of bees. In a first approach we monitored their movement in a small arena before and after being fed with sugar water containing clothianidin or thiacloprid. We observed increased motor activity after clothianidin and a decreased activity after thiacloprid-treatment. 
To analyze the effects on motor activity we recorded electromyograms of the muscle M17 before and during insecticide perfusion. Muscle spikes and proboscis extension reactions were elicited by stimulating the antennae and the proboscis with sugar solution. We investigated neonicotinoid-induced changes by determining spikes at different intervals after substance application. Insecticide or phosphate-buffered saline was pipetted onto the brain. Our results showed that clothianidin increased the muscle activity and in some animals even led to continuous spiking without sugar stimulation. By contrast, imidacloprid and thiacloprid reduced the spike activity during the whole recording period (1h). Our results, although preliminary, indicate distinct effects of the various insecticides on honeybee motor activity. Tone of the next steps will be to study, whether neonicotinoids act on neurons, muscles or both.

Wissenschaftlicher Werdegang

 seit 2011
Doktorandin am Institut für Bienenkunde (Polytechnische Gesellschaft) / (Goethe-Universität Frankfurt am Main)

Doktorarbeit: Cholinerge synaptische Übertragung im olfaktorischen System der Honigbiene und Auswirkungen von Insektiziden
2004-2010 Studium der Biologie an der Universität Bremen (Hauptfach: Zoologie, Nebenfächer: Ökologie, Psychologie)

Diplomarbeit: „Zuckersensitivität und Sammelverhalten der indischen Zwerghonigbiene Apis florea“
(durchgeführt in Bangalore, Indien)

Studium Kultur- und Sprachmittler (Dänisch/Englisch) an der Syddansk Universitet Sønderborg (Dänemark
Abschluss: Bachelor of Arts   



Triltsch, M.; Fischer, J.; Grünewald, B. (2012) Effects of neonicotinoid insecticides on the spike frequency of the honeybee proboscis muscle M17. IN:
  proceedings of the 59th annual meeting, association of the institutes for bee research, Bonn, Germany
Triltsch, M.; Fischer, J.; Kabat vel Job, K.; Grünewald, B. (2012) Effects of neonicotinoid insecticides on the muscle activity of the honeybee. IN: Eurbee
  5th European Conference of Apidology, Halle, Germany