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Movement patterns in the green sea urchin, Strongylocentrotus droebachiensis

Published online by Cambridge University Press:  12 January 2006

Jean-Sébastien Lauzon-Guay
Affiliation:
Department of Biology, University of New Brunswick, Bag Service 45111, Fredericton, New Brunswick, E3B 6E1, Canada
Robert E. Scheibling
Affiliation:
Department of Biology, Dalhousie University, Halifax, Nova Scotia, B3H 4J1, Canada
Myriam A. Barbeau
Affiliation:
Department of Biology, University of New Brunswick, Bag Service 45111, Fredericton, New Brunswick, E3B 6E1, Canada

Abstract

Time-lapse video was used to record movement paths of Strongylocentrotus droebachiensis on a rocky bottom at 8 m depth, both at a grazing front and in recently formed barrens in the wake of the front. Urchins did not exhibit strong directionality in movement and we did not detect any differences in movement variables between the front and barrens. Density of conspecifics had a negative effect on the speed, move length (distance), and daily displacement of urchins, but did not significantly affect the proportion of time spent moving, the linearity index and the number of moves taken per day. The frequency distributions of turning angles between moves and steps were non-uniformly distributed, indicating directionality in individual paths. A correlated random walk model was used to predict the displacement of urchins through time and provided a good fit with observed data. Our results provide insight into the foraging behaviour of S. droebachiensis and are consistent with previous observations of small-scale movement in this species.

Type
Research Article
Copyright
2006 Marine Biological Association of the United Kingdom

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