Boldest individuals of social species tasked with seeking out prey
Courtesy of Lena Grinsted
The career choices of one type of social spider depend on its personality. Character wins out over factors such as age or body size in shaping the spider’s job prospects, researchers report July 31 in the Proceedings of the Royal Society B.
Lena Grinsted of Aarhus University in Denmark and colleagues marked more than 600 Stegodyphus sarasinorum spiders with brightly colored paint to identify individuals. Then the team gave the spiders a personality quiz.
Researchers measured spiders’ boldness by blasting them with a puff of air and aggression by prodding them with a stick. Bold spiders froze when they first felt the air but quickly recovered. Aggressive spiders struck a threatening pose after feeling the stick.
Then the team let the spiders build nests for hiding and webs for capturing prey. When the researchers wiggled a leaf in the webs to mimic a struggling insect, the boldest spiders hustled out to investigate. The findings bolster the idea that spider colonies are not homogenous societies where everyone contributes in the same way, the authors suggest.
L. Grinsted et al. Individual personalities shape task differentiation in a social spider. Proceedings of the Royal Society B. Published online July 31, 2013. doi: 10.1089/rspb.2013.1407. [Go to]