The ancestors of honeybees, living 50 million years ago, were fairly choosy when it came to feeding their offspring. This is shown in a study sponsored by the University of Bonn, which also included researchers from Austria and the United States. According to the study, the pollen that these insects collected for their larvae always originated from the same plants. When it came to their own meals, they were less picky – on their collection flights, they ate pretty much everything that turned up in front of their mouth parts. The findings from this study have now appeared in the “Current Biology” trade journal.
The paleontologists studied fossilized bees from two different locations: the Messel Pit near Darmstadt and Eckfeld Maar in the Vulkaneifel. Both are former volcanic crater lakes, so deep that there was no oxygen to be found at the bottom. Any animals or plants that fell into the water were thus outstandingly preserved in the bottom sediment.
This image shows two fossilized bees and a few sample pollen types that were stuck to their back legs.
© Photo: AG Wappler/Uni Bonn
Nearly 50 million years ago, numerous bees met this very fate. Many of them were very well preserved in the oil shale rock. “For the first time, we are taking advantage of this circumstance in order to get a closer look at the pollen on the bees’ bodies,” explains Dr. Torsten Wappler. Dr. Wappler, an associate professor at the Steinmann Institute for Geology, Mineralogy and Paleontology at the University of Bonn, is the first author of the study.
Bees were both generalists and specialists
In their analyses, the researchers noticed a strange pattern: the pollen near the hymenoperans’ heads, chests and abdomens came from completely different plants. The pollen on their back legs, on the other hand, mainly came from evergreen bushes, which produce very similar blossoms.
The back legs of the long-extinct hymenoptera featured characteristic structures. The bees used them as transport containers (today’s honeybees have a very similar arrangement on their back legs). The insects used their front legs to comb pollen grains out of their body hair, and then transferred the pollen to their back legs.
However, this only worked if their front legs could reach the pollen easily – we human beings have trouble scratching between our shoulder blades, after all. “The bushes where the worker bees collected food for their larvae all had a similar blossom structure,” explains Dr. Wappler. “After they visited those blossoms, the pollen mainly stuck to parts of their bodies where it was easy to transfer to their legs.”
The prehistoric bees seemed to know which plants would give them a successful harvest, and they mainly targeted those blossoms. If they got hungry on the way, they landed on plants along their flight path and sipped the nectar. The pollen that stuck to their bodies shows how undiscriminating they were in their snacking.
Searching for food without wasting time
“This was a good strategy for the bees,” points out Dr. Wappler. “When they were looking for food for the larvae, they visited blossoms that offered a high yield with little effort. On the way there, on the other hand, they ate whatever they happened to find. So they didn’t waste any time looking for especially delicious or nutritious food.”
There was one thing that especially surprised the researchers: the bees from Eckfeld Maar were 44 million years old, while those from Messel were 48 million years old. Nonetheless, they had very similar pollen patterns on their legs and bodies. Even among the precursors of today’s bumblebees, the distribution was very similar. The dual strategy thus seems to have been common in various species, and stayed consistent for millions of years.
Even today, our honeybees use a similar approach. It is possible that the very first bees, which populated the earth about 100 million years ago, did the same thing. “Unfortunately there are no finds from that era that would allow us to analyze the pollen,” says Dr. Wappler.
Publication: Torsten Wappler, Conrad C. Labandeira, Michael S. Engel, Reinhard Zetter and Friðgeir Grímsson: Specialized and generalized pollen-collection strategies in an ancient bee lineage; “Current Biology”
PD Dr. Torsten Wappler
Steinmann Institute for Geology, Mineralogy and Paleontology
University of Bonn
Johannes Seiler | idw - Informationsdienst Wissenschaft
Fossil coral reefs show sea level rose in bursts during last warming
19.10.2017 | Rice University
NASA finds newly formed tropical storm lan over open waters
17.10.2017 | NASA/Goddard Space Flight Center
University of Maryland researchers contribute to historic detection of gravitational waves and light created by event
On August 17, 2017, at 12:41:04 UTC, scientists made the first direct observation of a merger between two neutron stars--the dense, collapsed cores that remain...
Seven new papers describe the first-ever detection of light from a gravitational wave source. The event, caused by two neutron stars colliding and merging together, was dubbed GW170817 because it sent ripples through space-time that reached Earth on 2017 August 17. Around the world, hundreds of excited astronomers mobilized quickly and were able to observe the event using numerous telescopes, providing a wealth of new data.
Previous detections of gravitational waves have all involved the merger of two black holes, a feat that won the 2017 Nobel Prize in Physics earlier this month....
Material defects in end products can quickly result in failures in many areas of industry, and have a massive impact on the safe use of their products. This is why, in the field of quality assurance, intelligent, nondestructive sensor systems play a key role. They allow testing components and parts in a rapid and cost-efficient manner without destroying the actual product or changing its surface. Experts from the Fraunhofer IZFP in Saarbrücken will be presenting two exhibits at the Blechexpo in Stuttgart from 7–10 November 2017 that allow fast, reliable, and automated characterization of materials and detection of defects (Hall 5, Booth 5306).
When quality testing uses time-consuming destructive test methods, it can result in enormous costs due to damaging or destroying the products. And given that...
Using a new cooling technique MPQ scientists succeed at observing collisions in a dense beam of cold and slow dipolar molecules.
How do chemical reactions proceed at extremely low temperatures? The answer requires the investigation of molecular samples that are cold, dense, and slow at...
Scientists from the Max Planck Institute of Quantum Optics, using high precision laser spectroscopy of atomic hydrogen, confirm the surprisingly small value of the proton radius determined from muonic hydrogen.
It was one of the breakthroughs of the year 2010: Laser spectroscopy of muonic hydrogen resulted in a value for the proton charge radius that was significantly...
17.10.2017 | Event News
10.10.2017 | Event News
10.10.2017 | Event News
19.10.2017 | Materials Sciences
19.10.2017 | Materials Sciences
19.10.2017 | Physics and Astronomy