Bill S. Hansson How Do Insects Use Their Sense of Smell and How Does It Function?
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Max Planck Society
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Max Planck Institute for Chemical Ecology
"The Max Planck Institute for Chemical Ecology in Jena investigates the role, diversity and characteristics of chemical signals which control the interactions between organisms and their environment. Scientists from the fields of ecology, biochemistry, organic chemistry, entomology, ethology, and insect physiology work closely together in the Institute in order to understand the complex system of chemical communication. Their research focuses on the co-evolution of plants and insects. The fact that plants usually spend their entire lives in one place forces them to use effective strategies to guarantee that their offspring are spread and also to protect themselves against pests and diseases. To this effect, plants have developed a wide range of chemical signalling compounds that enable them to optimise their adaptation to their respective environments. These so-called allelochemicals are used to, among other things, attract pollinators, fend off herbivores and pests, fight diseases and keep unwelcome competitors away. Plants also synthesise mixtures of many organic substances that have a deterrent or toxic effect on herbivores. As a countermeasure, insects that feed on plants adapt accordingly and, for their part, try to overcome plant defences." (Source)
Insects are very smell-dependent which makes them prime candidates for studying how the sense of smell works and how it influences behavior. In this video, BILL S. HANSSON describes how the research team studied the olfactory system of flies. Following the whole process from molecule detection and the reaction of the nerves to the outcome of behavior the researchers found a line in the fly's brain that identifies bad odors and leads the fly to avoid these smells as they indicate something is toxic. Because the olfactory systems of all species work in a similar way, the findings can be used to draw conclusions to the human sense of smell.
LT Video Publication DOI: http://dx.doi.org/10.21036/LTPUB10198
A Conserved Dedicated Olfactory Circuit for Detecting Harmful Microbes in Drosophila
- Marcus C. Stensmyr, Hany K.M. Dweck, Abu Farhan, Irene Ibba, Antonia Strutz, Latha Mukunda, Jeanine Linz, Veit Grabe, Kathrin Steck, Sofia Lavista-Llanos, Dieter Wicher, Silke Sachse, Markus Knaden et al
- Published in 2012