Abstract

MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 273:239-249 (2004) - doi:10.3354/meps273239 Individual behavior and emergent properties of fish schools: a comparison of observation and theory Steven V. Viscido1,2,*, Julia K. Parrish1,2, Daniel Grünbaum3 1Department of Biology, 2School of Aquatic and Fishery Sciences, and 3School of Oceanography, Box 351800 Kincaid Hall, University of Washington, Seattle, Washington 98195, USA *Email: viscido@u.washington.edu ABSTRACT: Polarity, group velocity, and inter-individual spacing are characteristics of fish schools that strongly affect individual school members. However, these characteristics are group-level Œemergent properties¹: collective outcomes of behavioral interactions among members, not under direct control of any single member. The relationships between members¹ behaviors and the emergent group properties they produce are complex and poorly understood. In this study, we quantified 3D trajectories of all individual fish within 4- and 8-fish populations of Danio aequipinnatus, using stereo videography and a computerized tracking algorithm. We compared group polarity, group speed, and mean nearest-neighbor distances of schools within these populations to a simulation model that explored how fish responded to attraction/repulsion, alignment and random forces. Real fish exhibited a high degree of temporal variability in both polarity and group speed. Polarity and speed of simulated schools depended very strongly on the strength of the alignment force. Time-averaged polarity of real fish schools was most similar to simulated schools when alignment force was 1 to 5% of the attraction/repulsion force. For both real and simulated fish, a clear relationship existed between group speed and polarity: polarized groups were faster than non-polarized groups. We propose a multi-dimensional state space where several emergent property statistics are represented along the axes, and suggest certain Œpreferred¹ ranges of state space within which animal groups tend to localize, and in which they can sustain distinct types of regular architecture. KEY WORDS: Social aggregation · Schooling behavior · Emergent properties · Polarity · Group speed · Nearest-neighbor distance · Danio aequipinnatus Full text in pdf format PreviousNextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 273. Online publication date: June 08, 2004 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2004 Inter-Research.

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