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Occurrence of the physonect siphonophore Apolemia uvaria off Plymouth and in south-west England

  • Keith Hiscock (a1), Gillian M. Mapstone (a2), David V.P. Conway (a1) and Nicholas Halliday (a1)

In September 2007, observations were made of a siphonophore in surface waters and near to the seabed by sea users off south Devon and south-east Cornwall. The same siphonophore was also recorded from regular samples collected offshore of Plymouth. The species is identified as Apolemia uvaria, which had not previously been recorded off Plymouth. It was sampled until March 2008 and re-appeared, in smaller numbers, in autumn 2008 until February 2009 but was not reliably reported in autumn 2009 (to end of October). The occurrence is unlikely to be due to sea warming, but more likely some variation in oceanic currents, possibly influxes of Atlantic water.

Corresponding author
Correspondence should be addressed to: K. Hiscock Marine Biological Association of the United Kingdom The Laboratory, Citadel Hill, Plymouth PL1 2PB, UK email:
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Båmstedt U., Fosså J.H., Martinussen M.B. and Fosshagen A. (1998) Mass occurrence of the physonect siphonophore Apolemia uvaria (Lesueur) in Norwegian waters. Sarsia 83, 7985.
Fraser J.H. (1961) The oceanic and bathypelagic plankton of the north-east Atlantic. Marine Research 4, 148.
Kirkpatrick P.A. and Pugh P.R. (1984) Siphonophores and velellids. Synopsis of the British Fauna, Number 29. London: The Linnean Society of London and The Estuarine and Brackish-Water Sciences Association, E.J. Brill.
Mapstone G.M. (2003) Redescriptions of two physonect siphonophores, Apolemia uvaria (Lesueur, 1815) and Tottonia contorta Margulis, 1976, with comments on a third species Ramosia vitiazi Stepanjants, 1967 (Cnidaria: Hydrozoa: Apolemiidae). Systematics and Biodiversity 1, 181212.
Mapstone G.M. (2009) Siphonophora (Cnidaria: Hydrozoa) of Canadian Pacific waters. Ottawa: NRC Press, 302 pp.
Marine Biological Association (1957) Plymouth marine fauna. Plymouth: The Marine Biological Association of the United Kingdom.
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Marine Biodiversity Records
  • ISSN: -
  • EISSN: 1755-2672
  • URL: /core/journals/marine-biodiversity-records
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