The study is the first to compare multiple species of related animals, in this case social wasps, to look at how roles of individuals in a society might affect brain architecture.
The research looks at brain structure differences between species, asking how the size of different brain regions relates to each species' social complexity and nest architecture. The results are being published Wednesday (June 24) in the British journal Proceedings of the Royal Society B. The Royal Society is the United Kingdom's national academy of sciences.
"It looks as if different brain regions respond to specific challenges. It is important to find these relationships because they can tell us which challenges guide brain evolution," said Sean O'Donnell, a University of Washington associate professor of psychology and co-author of the study.
O'Donnell and lead author Yamile Molina, who just completed work on her doctorate at the UW, looked at the brains of eight New World social wasp species from Costa Rica and Ecuador.
"One idea is that social interactions themselves put on demands for advanced cognitive abilities. We are interested in finding out exactly which social and environmental factors favor an increase in a given brain region," said Molina.
The UW researchers captured queens and female workers from colonies of the eight wasp species and examined their brains. For the most part, males usually don't play an important behavioral role in a social wasp colony's labor and other activities, according to O'Donnell. However, a follow-up study will look at the male wasp brain structure.
In examining the female wasps, the researchers found strong evidence that queens, rather than workers, have distinct brain structure that matches the species' cognitive challenges.
Social wasps form colonies differently and build two types of nests. In more primitive wasps, a queen mates and flies away separately to establish a small colony. Among the more advanced social wasps, several young queens and a group of workers leave a colony as a swarm to establish a new colony that has a much larger population. Independent founders and a few swarm founders build open-comb nests, while most swarm founders build enclosed nests with interiors that are much darker.
Molina and O'Donnell found that queens from open-comb nests had larger central brain processing regions that are devoted to vision than queens from closed-nest colonies. Queens from enclosed nests, where vision isn't as important and where they rely on chemical communication through pheromones, had larger antennal lobes to process chemical messages than queens from open nests.
Among independent-founding wasps, where queens regulate the behavior of a colony, queens had larger vision-processing regions (called mushroom body collars) than their workers. But among swarm-founders, which have a decentralized form of colony regulation, workers had larger mushroom body collars and larger optic lobes than queens.
"We can learn things about ourselves from a whole variety of animals. When neurobiologists use animal models they often look to rodents and primates," said Molina. "I would argue social insects like wasps are like us in some ways and should be an important model as well. In this study we found that it's not being social, but how you are social that explains brain architecture. The brain can be a mirror reflecting what an animal is using it for."
Co-author of the paper is Robin Harris, a UW doctoral student in neurobiology. The Society for Comparative and Integrative Biology and the National Science Foundation funded the research.
For more information, contact Molina at firstname.lastname@example.org or O'Donnell at 206-543-2315 or email@example.com.
Joel Schwarz | EurekAlert!
Drone vs. truck deliveries: Which create less carbon pollution?
31.05.2017 | University of Washington
New study: How does Europe become a leading player for software and IT services?
03.04.2017 | Fraunhofer-Institut für System- und Innovationsforschung (ISI)
An international team of scientists has proposed a new multi-disciplinary approach in which an array of new technologies will allow us to map biodiversity and the risks that wildlife is facing at the scale of whole landscapes. The findings are published in Nature Ecology and Evolution. This international research is led by the Kunming Institute of Zoology from China, University of East Anglia, University of Leicester and the Leibniz Institute for Zoo and Wildlife Research.
Using a combination of satellite and ground data, the team proposes that it is now possible to map biodiversity with an accuracy that has not been previously...
Heatwaves in the Arctic, longer periods of vegetation in Europe, severe floods in West Africa – starting in 2021, scientists want to explore the emissions of the greenhouse gas methane with the German-French satellite MERLIN. This is made possible by a new robust laser system of the Fraunhofer Institute for Laser Technology ILT in Aachen, which achieves unprecedented measurement accuracy.
Methane is primarily the result of the decomposition of organic matter. The gas has a 25 times greater warming potential than carbon dioxide, but is not as...
Hydrogen is regarded as the energy source of the future: It is produced with solar power and can be used to generate heat and electricity in fuel cells. Empa researchers have now succeeded in decoding the movement of hydrogen ions in crystals – a key step towards more efficient energy conversion in the hydrogen industry of tomorrow.
As charge carriers, electrons and ions play the leading role in electrochemical energy storage devices and converters such as batteries and fuel cells. Proton...
Scientists from the Excellence Cluster Universe at the Ludwig-Maximilians-Universität Munich have establised "Cosmowebportal", a unique data centre for cosmological simulations located at the Leibniz Supercomputing Centre (LRZ) of the Bavarian Academy of Sciences. The complete results of a series of large hydrodynamical cosmological simulations are available, with data volumes typically exceeding several hundred terabytes. Scientists worldwide can interactively explore these complex simulations via a web interface and directly access the results.
With current telescopes, scientists can observe our Universe’s galaxies and galaxy clusters and their distribution along an invisible cosmic web. From the...
Temperature measurements possible even on the smallest scale / Molecular ruby for use in material sciences, biology, and medicine
Chemists at Johannes Gutenberg University Mainz (JGU) in cooperation with researchers of the German Federal Institute for Materials Research and Testing (BAM)...
19.06.2017 | Event News
13.06.2017 | Event News
13.06.2017 | Event News
27.06.2017 | Power and Electrical Engineering
27.06.2017 | Information Technology
27.06.2017 | Physics and Astronomy