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Study confirms bumblebees experience better vision through movement

Bumblebees experience better vision through movement
Left: A walking bumblebee with increased temperature of the chest and head area. Right: A sitting bumblebee with lower, constant temperature. The electrical responses of the eye in the middle show that the bumblebee processes visual stimuli faster while walking than while sitting. Credit: Lisa Rother / Uni Würzburg

When bumblebees move, their vision improves. Scientists at the University of Würzburg have now been able to prove this supposition.

It was already known from other insects that running or flying accelerates the processing of visual information in the brain. However, whether active behavior also has an influence on the processing of stimuli in the eye had not been researched until now.

Using —i.e., measuring and recording —a team of researchers from the Julius Maximilians University of Würzburg (JMU) has now determined the reaction speed of the eye of while the animals were either sitting or walking. The scientists were able to show that walking bumblebees actually process visual information faster than sedentary ones. They now present their results in the journal Proceedings of the Royal Society B.

Walking bumblebees see 20 percent faster

"The results were quite remarkable: walking bumblebees see 20 percent faster than their static conspecifics," reports Professor Keram Pfeiffer from the Department of Zoology II at JMU.

Bumblebees are able to actively increase their body temperature and thus also accelerate the course of biochemical processes. To do this, they tremble with their flight muscles. Simultaneous measurement of temperature and eye reaction speed suggested that the observed gain in reaction speed could be a result of increased body temperature.

"We were able to prove that this was indeed the case by irradiating sitting animals with a heat lamp and reproducing the results in this way," explains Lisa Rother. The doctoral student is, together with Robin Müller, first author of the study.

It was already known that higher enables faster vision. In further investigations, the researchers were able to quantify how much brighter the light had to be in order to achieve a similar increase as a result of movement. Result: The light intensity had to be increased by a factor of 14.

Follow-up experiments for deeper insights

Further studies are to clarify what benefit the bumblebees derive from this effect and whether they perhaps even actively use it.

According to Robin Müller, there are basically two possible explanations. The first possibility: "The animals warm up their flight muscles while running so that they can take off at any time. In this case, the observed increase in visual speed would merely be a useful side effect."

The second possibility: the animals actively warm up to process visual stimuli faster. This would have benefits simply because the visually perceived environment changes more rapidly when in motion. So the bumblebees can also process these faster images more quickly. In flight, the bumblebees' head temperature rises to about 35°C. At the same time, the processing time for visual information in the eye would then be only half as long as in a sitting position—which would be fitting for the even greater flood of information in flight.

More information: Lisa Rother et al, Walking bumblebees see faster, Proceedings of the Royal Society B: Biological Sciences (2023). DOI: 10.1098/rspb.2023.0460

Citation: Study confirms bumblebees experience better vision through movement (2023, June 7) retrieved 21 September 2023 from
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