Confirmation of the occurrence of a second killer whale morphotype in South African waters

Show simple item record Best, Peter B. Meyer, M.A. Thornton, Meredith Kotze, P.G.H. Seakamela, S.M. Hofmeyr, G.J. Greg (Gordon John Gregory) Wintner, S. Weland, C.D. Steinke, D. 2014-09-18T07:13:31Z 2014
dc.description.abstract Killer whales Orcinus orca occur worldwide in a number of morphotypes that differ in size, pigmentation, acoustic behaviour, food type and genetics – some may indeed warrant subspecific or even specific status. Until recently, all killer whales in South African waters were referred to a single morphotype, Type A, but three individuals (two males and one female) that have stranded since 1969 differ in several respects from other killer whales examined from the region. Adult length is some 1–1.5 m smaller, appendages such as dorsal fin and flippers tend to be relatively larger, and tooth wear is excessive. Although dietary information is scant, one stomach contained the remains of several elasmobranchs, identified from a DNA subsample as blue sharks Prionace glauca, a dietary item that, if habitual, might account for the tooth wear. This morphotype, referred to here as ‘flat-toothed’ and which in several respects resembles the offshore form in the North Pacific and the Type 1 form in the North Atlantic, does not seem to have been recorded previously from the Southern Hemisphere. en_US
dc.description.librarian hb2014 en_US
dc.description.sponsorship National Research Foundation, South Africa en_US
dc.description.uri en_US
dc.identifier.citation PB Best, MA Meÿer, M Thornton, PGH Kotze, SM Seakamela, GJG Hofmeyr, S Wintner, CD Weland & D Steinke (2014) Confirmation of the occurrence of a second killer whale morphotype in South African waters, African Journal of Marine Science, 36:2, 215-224, DOI:10.2989/1814232X.2014.923783. en_US
dc.identifier.issn 1814-232X (print)
dc.identifier.issn 0257-7615 (online)
dc.identifier.other 10.2989/1814232X.2014.923783
dc.language.iso en en_US
dc.publisher Taylor & Francis en_US
dc.rights © NISC (Pty) Ltd. African Journal of Marine Science is co-published by NISC (Pty) Ltd and Taylor and Francis. This is an electronic version of an article published in African Journal of Marine Science, vol. 36, no. 2, pp. 215-224, 2014. doi : 10.2989/1814232X.2014.923783. African Journal of Marine Science is available online at : en_US
dc.subject Blue shark en_US
dc.subject Dentition en_US
dc.subject Morphometrics en_US
dc.subject Orcinus orca en_US
dc.subject Prey en_US
dc.title Confirmation of the occurrence of a second killer whale morphotype in South African waters en_US
dc.type Postprint Article en_US

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