Related Experiment Videos
Tracing pollinator footprints on natural flowers.
1Department of Neurobiology, Sensory Ecology Group, University of Düsseldorf, Universitätsstr. 1, 40225 Düsseldorf, Germany. eltz@uni-duesseldorf.de
Journal of Chemical Ecology
|June 2, 2006
Summary
Bumblebees leave chemical footprints on flowers, primarily pentacosenes, that indicate recent visits. This discovery suggests flower surfaces record pollinator activity and species, impacting scent mark interpretations.
Area of Science:
- Ecology
- Chemical Ecology
- Insect Behavior
Background:
- Insects deposit lipid footprints on surfaces, potentially aiding adhesion.
- Bumblebee footprint hydrocarbons act as scent marks, signaling depleted flowers.
Purpose of the Study:
- To detect and quantify hydrocarbons deposited by bumblebees on flowers.
- To investigate the role of these chemical footprints in pollinator-flower interactions.
Main Methods:
- Gas chromatography-mass spectrometry (GC-MS) was used to analyze corolla extracts.
- Quantitative analysis of pentacosenes (C25H50) in relation to bumblebee visits.
Main Results:
- Odd-numbered alkenes, specifically pentacosenes, were detected on visited flowers.
- Pentacosenes accumulated linearly with the number of bumblebee visits (approx. 16 ng/visit).
- Deposited pentacosenes remained on flowers for at least 2 hours.
Conclusions:
- Flower epicuticles retain a chemical record of pollinator visitation.
- This chemical record can potentially identify visiting bee species.
- Continuous footprint accumulation challenges existing theories on repellent scent marks.