https://doi.org/10.1140/epjst/e2015-50077-5
Regular Article
Velocity correlations in laboratory insect swarms
1 Department of Mechanical Engineering and Materials Science, Yale University, New Haven, Connecticut 06520, USA
2 Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
3 Department of Civil and Environmental Engineering, Stanford University, Stanford, California 94305, USA
a e-mail: nto@stanford.edu
Received: 26 March 2015
Revised: 2 November 2015
Published online: 15 December 2015
In contrast to animal groups such as bird flocks or migratory herds that display net, directed motion, insect swarms do not possess global order. Without such order, it is difficult to define and characterize the transition to collective behavior in swarms; nevertheless, visual observation of swarms strongly suggests that swarming insects do behave collectively. It has recently been suggested that correlation rather than order is the hallmark of emergent collective behavior. Here, we report measurements of spatial velocity correlation functions in laboratory mating swarms of the non-biting midge Chironomus riparius. Although we find some correlation at short distances, our swarms are in general only weakly correlated, in contrast to what has been observed in field studies. Our results hint at the potentially important role of environmental conditions on collective behavior, and suggest that general indicators of the collective nature of swarming are still needed.
© EDP Sciences, Springer-Verlag, 2015