authorKatalin Ozogány and Tamás Vicsek
year2015
titleModeling the emergence of modular leadership hierarchy during the collective motion of herds made of harems
journalJ. Stat. Phys.
volume158
number3
pages628 - 646
projectleadership_hierarchy_in_wild_horses, hierarchy, overlapping_communities
issn0022-4715
project_groupleadership_and_social_dynamics_in_animal_collectives, complex_networks
url[url]
doi10.1007/s10955-014-1131-7
abstract
Gregarious animals need to make collective decisions in order to keep their cohesiveness. Several species of them live in multilevel societies, and form herds composed of smaller communities. We present a model for the development of a leadership hierarchy in a herd consisting of loosely connected sub-groups (e.g. harems) by combining self organization and social dynamics. It starts from unfamiliar individuals without relationships and reproduces the emergence of a hierarchical and modular leadership network that promotes an effective spreading of the decisions from more capable individuals to the others, and thus gives rise to a beneficial collective decision. Our results stemming from the model are in a good agreement with our observations of a Przewalski horse herd (Hortob\'agy, Hungary). We find that the harem-leader to harem-member ratio observed in Przewalski horses corresponds to an optimal network in this approach regarding common success, and that the observed and modeled harem size distributions are close to a lognormal.

BibTex record:

@article{ozogany2014horsehier,
author = {Katalin Ozogány and Tamás Vicsek},
year = {2015},
title = {Modeling the emergence of modular leadership hierarchy during the collective motion of herds made of
harems},
journal = {J. Stat. Phys.},
volume = {158},
number = {3},
pages = {628 - 646},
project = {leadership_hierarchy_in_wild_horses, hierarchy, overlapping_communities},
issn = {0022-4715},
project_group = {leadership_and_social_dynamics_in_animal_collectives, complex_networks},
url = {http://arxiv.org/abs/1403.0260},
doi = {10.1007/s10955-014-1131-7},
abstract = {Gregarious animals need to make collective decisions in order to keep their cohesiveness. Several
species of them live in multilevel societies, and form herds composed of smaller communities. We
present a model for the development of a leadership hierarchy in a herd consisting of loosely
connected sub-groups (e.g. harems) by combining self organization and social dynamics. It starts
from unfamiliar individuals without relationships and reproduces the emergence of a hierarchical and
modular leadership network that promotes an effective spreading of the decisions from more capable
individuals to the others, and thus gives rise to a beneficial collective decision. Our results
stemming from the model are in a good agreement with our observations of a Przewalski horse herd
(Hortob\'agy, Hungary). We find that the harem-leader to harem-member ratio observed in Przewalski
horses corresponds to an optimal network in this approach regarding common success, and that the
observed and modeled harem size distributions are close to a lognormal.},
}