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Title: Bathymetric segregation of sea urchins on reefs of the Canarian Archipelago: Role of flow-induced forces
Authors: Tuya, F. 
Cisneros-Aguirre, J. 
Ortega-Borges, L.
Haroun, R. J. 
UNESCO Clasification: 251005 Zoología marina
2510 Oceanografía
Keywords: Sea urchin
Vertical distribution
Water movement
Spatial patterns
Issue Date: 2007
Publisher: 0272-7714
Journal: Estuarine, Coastal and Shelf Science 
Abstract: We examined whether adults of three species of sea urchins species (Diadema antillarum, Arbacia lixula, and Paracentrotus lividus) exhibit a consistent depth-dependent partitioning pattern on rocky reefs of the Canarian Archipelago (eastern Atlantic). Hydrodynamic experiments were carried out to quantify the resistance to flow-induced dislodgement in these three species. We tested the model that different morphology can result in habitat partitioning among these sea urchins. Abundances of D. antillarum increased with depth. In contrast, A. lixula and P. lividus showed the opposite zonation pattern, coexisting in high abundances in the shallowest depths (<5 m), and occurring in low densities in the deepest part of reefs (>7 m). Both A. lixula and P. lividus had greater adhesion-surface to body-height ratios than D. antillarum. Similarly, A. lixula and P. lividus showed a greater ability to resist flow-induced dislodgement compared with D. antillarum. The mean “velocity of dislodgement” was ∼300% and 50% greater for A. lixula and P. lividus, respectively, relative to D. antillarum, for any particular size. As a result, A. lixula and P. lividus are better fitted to life in high-flow environments than D. antillarum. We conclude that the risk of dislodgement by water motion likely play a relevant role in the vertical distribution patterns of these sea urchins in the eastern Atlantic.
ISSN: 0272-7714
DOI: 10.1016/j.ecss.2007.02.007
Source: Estuarine Coastal And Shelf Science [ISSN 0272-7714], v. 73 (3-4), p. 481-488
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