Two methods for quantifying the development of dominance hierarchies in large groups with applications to Harris' sparrows

TitleTwo methods for quantifying the development of dominance hierarchies in large groups with applications to Harris' sparrows
Publication TypeJournal Article
Year of Publication1987
AuthorsChase, ID, Rohwer, S
JournalAnimal Behavior
Volume35
Pagination1113 -1118
Accession NumberKNZ00135
Abstract

Two new methods for quantitatively describing behavioural processes of hierarchy formation in large groups are introduced. These methods supplement those already available with the jigsaw puzzle approach to hierarchy formation and they examine behavioural sequences in component triads, subgroups of three individuals, making up the larger group. The first method gives a new procedure for counting various kinds of attack sequences in component triads, and the second traces how relationships evolve in triads. Used together, the procedures can help explain the development of dominance structures, and in particular, what kinds of interactions produce those that are linear or near-linear. The methods are illustrated by applying them to large flocks of Harris' sparrows, Zonotrichia quereula, having 12-17 members, during hierarchy formation. This application indicates that different behavioural mechanisms may be involved in hierarchy formation for large and small groups and that some configurations of interactions in triads are much more stable than others, namely, transitive ones are much more resistant to reversals than intransitive ones. These findings suggest that earlier and later interactions may not be independent and raise a number of interesting questions about individual-level mechanisms operating during hierarchy formation

DOI10.1016/S0003-3472(87)80168-9