Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Despite darkness, nocturnal bees learn visual landmarks while foraging at night

10.08.2004


Day-active bees, such as the honeybee, are well known for using visual landmarks to locate a favoured patch of flowers, and to find their way home again to their hive. Researchers have now found that nocturnal bees can do the same thing, despite experiencing light intensities that are more than 100 million times dimmer than daylight. The new findings, reported in the latest issue of Current Biology by a team led by Eric Warrant at Lund University, Sweden, advance our understanding of the visual powers of nocturnal animals.



The competitive and dangerous world of the tropical rainforest has driven many normally day-active animals to adopt a nocturnal lifestyle, with the cover of darkness allowing them to exploit food resources in relative peace. Several groups of bees and wasps – including the Central American halictid bee Megalopta genalis – have become nocturnal, and despite the darkness and their apparently insensitive compound eyes, they have retained remarkable visual abilities. In the new work, performed on Barro Colorado Island in Panama, the researchers used infrared night-imaging cameras to show that by performing special orientation flights, Megalopta visually learns landmarks around the nest entrance prior to foraging and uses these landmarks to locate the nest upon return. The researchers found that if landmarks were moved to a nearby site while the bee was away, upon her return she intently searched for her nest in the landmark-bearing, but wrong, location.

Despite this impressive behavioral sensitivity, optical and physiological measurements revealed that Megalopta’s eyes are only about 30 times more sensitive to light than those of day-active honeybees, woefully inadequate to account for Megalopta’s nocturnal homing abilities. A solution to this paradox may lie outside the eye. The researchers identified in the bee’s brain specialised visual cells with morphologies suited to summing light signals and intensifying the received image.

Göran Frankel | alfa
Further information:
http://www.lu.se
http://www.vr.se

More articles from Life Sciences:

nachricht Ion treatments for cardiac arrhythmia — Non-invasive alternative to catheter-based surgery
20.01.2017 | GSI Helmholtzzentrum für Schwerionenforschung GmbH

nachricht Seeking structure with metagenome sequences
20.01.2017 | DOE/Joint Genome Institute

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Traffic jam in empty space

New success for Konstanz physicists in studying the quantum vacuum

An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...

Im Focus: How gut bacteria can make us ill

HZI researchers decipher infection mechanisms of Yersinia and immune responses of the host

Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...

Im Focus: Interfacial Superconductivity: Magnetic and superconducting order revealed simultaneously

Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.

While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...

Im Focus: Studying fundamental particles in materials

Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales

Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...

Im Focus: Designing Architecture with Solar Building Envelopes

Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.

As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Sustainable Water use in Agriculture in Eastern Europe and Central Asia

19.01.2017 | Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

 
Latest News

Helmholtz International Fellow Award for Sarah Amalia Teichmann

20.01.2017 | Awards Funding

An innovative high-performance material: biofibers made from green lacewing silk

20.01.2017 | Materials Sciences

Ion treatments for cardiac arrhythmia — Non-invasive alternative to catheter-based surgery

20.01.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>