Recent models from theoretical physics have predicted that mass-migrating animal groups may share group-level properties, irrespective of the type animals in group. One key prediction is as density group increases, a rapid transition occurs disordered movement individuals within to highly aligned collective motion. Understanding such crucial control mobile swarming insect pests desert locust. We confirmed ordered and identified critical for onset coordinated marching locust nymphs. also...

Among the most striking aspects of movement many animal groups are their sudden coherent changes in direction. Recent observations locusts and starlings have shown that this directional switching is an intrinsic property motion. Similar direction switches seen self-propelled particle other models group Comprehending factors determine such key to understanding these groups. Here, we adopt a coarse-grained approach study model assuming underlying one-dimensional Fokker-Planck equation for mean...

The exceptional reactivity of animal collectives to predatory attacks is thought be owing rapid, but local, transfer information between group members. These groups turn together in unison and produce escape waves. However, it not clear how waves are created from local interactions, nor understood these patterns shaped by natural selection. By startling schools fish with a simulated attack an experimental arena, we demonstrate that changes the direction speed small percentage individuals...

ABSTRACT The fruit fly Drosophila melanogaster has emerged as a model organism for research on social interactions. Although recent studies have described how individuals interact foods nutrition and reproduction, the complex dynamics by which groups initially develop disperse received little attention. Here we investigated of collective foraging decisions D. their variation with group size composition. Groups adults larvae facing choice between two identical, nutritionally balanced food...

Nutrition impinges on virtually all aspects of an animal's life, including social interactions. Recent advances in nutritional ecology show how animals often trade-off individual nutrition and group cohesion when foraging simplified experimental environments. Here, we explore the spatial structure landscape influences these complex collective dynamics ecologically realistic We introduce individual-based model integrating key concepts geometry, animal behaviour to study groups large...

ABSTRACT In ants, nutrient acquisition for the whole colony relies on a minority of workers, foragers, which are often old and lean. Some studies have shown that link between age, physiology foraging activity is more flexible than once thought, especially in response to or environmental perturbations. This great plasticity offers intriguing possibility disentangle effect behaviour ants’ abilities cope with nutritional stresses. this paper, we first looked at capacity groups foragers...

Collective behaviour occurs at all levels of the natural world, from cells aggregating to form tissues, locusts interacting large and destructive plagues. These complex behaviours arise relatively simple interactions amongst individuals between their environment. For simplicity, mathematical models these phenomena often assume that population is homogeneous. However, heterogeneity arising due internal state can affect thus plays a role in dynamics group formation. In this paper, we present...

Wingless locust nymphs can form massive migratory groups known as bands, whose coordinated movement results from local interactions. We analysed the spatial distribution of locusts within naturally occurring bands and compared them with computer simulations to infer which interaction rules are used by individuals. found that empirical radial neighbours around a focal individual was isotropic, indicating tendency for interact all them, rather than bias towards pursuing individuals ahead or...

Access to nutrients is a key factor governing development, reproduction and ultimately fitness. Within social groups, contest-competition can fundamentally affect nutrient access, potentially leading reproductive asymmetry among individuals. Previously, agent-based models have been combined with the Geometric Framework of nutrition provide insight into how interactions one another. Here, we expand this modelling approach by incorporating evolutionary algorithms explore over acquisition might...

Distributions of stable isotopes have been used to infer an organism's trophic niche width, the ‘isotopic niche’, and examine resource partitioning. Spatial variation in isotopic composition prey may however confound interpretation signatures especially when foragers exploit resources across numerous locations. In this study compositions from marine assemblages are modelled determine role signature items effect dietary breadth foraging strategies on predator signatures. Outputs models reveal...

We present a minimal model to describe the onset of collective motion seen when population locusts are placed in an annular arena. At low densities is disordered, while at high march common direction, which may reverse during experiment. The data well-captured by individual-based model, demographic noise leads observed density-dependent effects. By fitting parameters equation-free coefficients, we give quantitative comparison, showing time series, stationary distributions and mean switching...