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Title: Patterns of nocturnal movement of the long-spined sea urchin Diadema antillarum (Philippi) in Gran Canaria (the Canary Islands, central East Atlantic Ocean)
Authors: Tuya, F. 
Martín García, Jose Antonio 
Luque Escalona, Ángel 
UNESCO Clasification: 240106 Ecología animal
240119 Zoología marina
2408 Etología
Keywords: Diadema antillarum
Sea urchin
The Canary Islands
Issue Date: 2004
Journal: Helgoland Marine Research 
Abstract: We tagged individuals of the sea urchin Diadema antillarum (Philippi) around the island of Gran Canaria (The Canary Islands) during winter 2001–2002 using a new technique, consisting of the insertion of a hook fastened to a fishing line into the aboral pole (periproctal membrane). This allowed individual identification of tagged sea urchins. The goals were: (1) to quantify nocturnal movements and the homing behaviour of this echinoid on shallow rocky bottoms, and (2) to assess short term spatial and temporal variability of these movements. Tagged sea urchins displayed clear homing behaviour. The mean distance travelled at night was 3.7±1.2 m (range 1.0–5.1 m). Mean speed of nocturnal movement was 33±26 cm h−1 (range 5–110 cm h−1). We observed greater movement at midnight than at the beginning and the end of the night.
ISSN: 1438-387X
DOI: 10.1007/s10152-003-0164-0
Source: Helgoland Marine Research [ISSN 1438-387X], v. 58, p. 26-31
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