Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Honeybees defy dino-killing ’nuclear winter’

05.11.2004


The humble tropical honeybee may challenge the idea that a post-asteroid impact "nuclear winter" was a big player in the decimation of dinosaurs 65 million years ago.



Somehow the tropical honeybee, Cretotrigona prisca, survived the end-Cretaceous extinction event, despite what many researchers believe was a years-long period of darkness and frigid temperatures caused by sunlight-blocking dust and smoke from the asteroid impact at Chicxulub.

The survival of C. prisca is problematic and telling, asserts paleontology graduate student Jacqueline M. Kozisek of the University of New Orleans. Late Cretaceous tropical honeybees preserved in amber are almost identical to their modern relatives, she says. If no modern tropical honeybee could have survived years in the dark and cold without the flowering plants they lived off of, Kozisek reasoned, something must be amiss with the nuclear winter theory. "It couldn’t have been that huge," says Kozisek of the Chicxulub-related temperature drops asserted by other researchers.


Kozisek will present her work on Monday, 8 Nov., at the Geological Society of America annual meeting in Denver. Modern tropical honeybees have an optimal temperature range of 88 to 93 degrees F (31-34°C) in order to maintain vital metabolic activities, according to entomological research, says Kozisek. That’s also the range that’s best for their food source: nectar-rich flowering plants.

Based on what is known about the Cretaceous climate and modern tropical honeybees, Kozisek estimates that any post-impact winter event could not have dropped temperatures more than 4 to 13 degrees F (2-7°C) without wiping out the bees. Current nuclear winter theories from the Chicxulub impact estimate drops of 13 to 22 degrees F (7-12°C) – too cold for tropical honeybees. "I’m not trying to say an asteroid impact didn’t happen," says Kozisek. "I’m just trying to narrow down the effects."

To do this, Kozisek took a novel approach for a paleontologist – instead of looking at what died out, she dug through the literature to find out what survived the massive extinction event. "I made a list of all survivors and picked those with strict survival requirements," said Kozisek. She determined that those survival requirements were by calling on studies of the closest modern analogues -- which wasn’t always easy for some species, she pointed out. There was, for instance, a very early primate that crawled out of the Cretaceous alive, but there is really no comparable small primate around today with which to reliably compare, she said.

On the other hand, a good number of tropical honeybees haven’t changed a lot in 65 million years and a great deal is known about modern tropical honey bees’ tolerances to heat and cold. What’s more, amber-preserved specimens of the oldest tropical honey bee, Cretotrigona prisca, are almost indistinguishable from – and are probably the ancestors of – some modern tropical honeybees like Dactylurina, according to other studies cited by Kozisek.

Survival and Its Implications: Tropical Honeybees (Hymenoptera: Apidae: Meliponini) and the Cretaceous-Tertiary Boundary Monday, 8 November, 10:30-10:45 a.m., CCC 605 Abstract may be viewed at: http://gsa.confex.com/gsa/2004AM/finalprogram/abstract_80171.htm.

Ann Cairns | EurekAlert!
Further information:
http://www.geosociety.org

More articles from Earth Sciences:

nachricht Using tree-fall patterns to calculate tornado wind speed
25.06.2018 | Ecological Society of America

nachricht Fast rising bedrock below West Antarctica reveals an extremely fluid Earth mantle
22.06.2018 | Technical University of Denmark

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Superconducting vortices quantize ordinary metal

Russian researchers together with their French colleagues discovered that a genuine feature of superconductors -- quantum Abrikosov vortices of supercurrent -- can also exist in an ordinary nonsuperconducting metal put into contact with a superconductor. The observation of these vortices provides direct evidence of induced quantum coherence. The pioneering experimental observation was supported by a first-ever numerical model that describes the induced vortices in finer detail.

These fundamental results, published in the journal Nature Communications, enable a better understanding and description of the processes occurring at the...

Im Focus: Temperature-controlled fiber-optic light source with liquid core

In a recent publication in the renowned journal Optica, scientists of Leibniz-Institute of Photonic Technology (Leibniz IPHT) in Jena showed that they can accurately control the optical properties of liquid-core fiber lasers and therefore their spectral band width by temperature and pressure tuning.

Already last year, the researchers provided experimental proof of a new dynamic of hybrid solitons– temporally and spectrally stationary light waves resulting...

Im Focus: Overdosing on Calcium

Nano crystals impact stem cell fate during bone formation

Scientists from the University of Freiburg and the University of Basel identified a master regulator for bone regeneration. Prasad Shastri, Professor of...

Im Focus: AchemAsia 2019 will take place in Shanghai

Moving into its fourth decade, AchemAsia is setting out for new horizons: The International Expo and Innovation Forum for Sustainable Chemical Production will take place from 21-23 May 2019 in Shanghai, China. With an updated event profile, the eleventh edition focusses on topics that are especially relevant for the Chinese process industry, putting a strong emphasis on sustainability and innovation.

Founded in 1989 as a spin-off of ACHEMA to cater to the needs of China’s then developing industry, AchemAsia has since grown into a platform where the latest...

Im Focus: First real-time test of Li-Fi utilization for the industrial Internet of Things

The BMBF-funded OWICELLS project was successfully completed with a final presentation at the BMW plant in Munich. The presentation demonstrated a Li-Fi communication with a mobile robot, while the robot carried out usual production processes (welding, moving and testing parts) in a 5x5m² production cell. The robust, optical wireless transmission is based on spatial diversity; in other words, data is sent and received simultaneously by several LEDs and several photodiodes. The system can transmit data at more than 100 Mbit/s and five milliseconds latency.

Modern production technologies in the automobile industry must become more flexible in order to fulfil individual customer requirements.

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Munich conference on asteroid detection, tracking and defense

13.06.2018 | Event News

2nd International Baltic Earth Conference in Denmark: “The Baltic Sea region in Transition”

08.06.2018 | Event News

ISEKI_Food 2018: Conference with Holistic View of Food Production

05.06.2018 | Event News

 
Latest News

Rapid water formation in diffuse interstellar clouds

25.06.2018 | Physics and Astronomy

Using tree-fall patterns to calculate tornado wind speed

25.06.2018 | Earth Sciences

'Stealth' material hides hot objects from infrared eyes

25.06.2018 | Power and Electrical Engineering

VideoLinks
Science & Research
Overview of more VideoLinks >>>