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‘Hedgehog’: a novel defensive posture in juvenile Amblyraja radiata

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Abstract:

Three cases of a novel defensive posture in the starry skate Amblyraja radiata are reported. The posture, termed ‘hedgehog’, is a graded response to contact by a diver and features a head‐up attitude with the belly oriented toward the diver, apposed pectoral disc margin, and presentation of the thorny, electrogenic organ‐equipped tail. This is the first description of defensive posture in any Rajiformes under natural conditions.

Keywords: agonistic display; batoid; behaviour; electrogenic organ

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.0022-1112.2006.00922.x

Affiliations: 1: Fish Museum, Department of Zoology, University of British Columbia, 6270 University Boulevard, Vancouver, BC V6T 1Z4, Canada and 2: Haukeberget 27, 5119 Ulset, Norway

Publication date: February 1, 2006

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