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Journal of Plankton Research Vol.23 no.10 pp.1073-1080, 2001
© Oxford University Press 2001

Biometry and size distribution of Chrysaora hysoscella (Cnidaria, Scyphozoa) and Aequorea aequorea (Cnidaria, Hydrozoa) off Namibia with some notes on their parasite Hyperia medusarum

Emmanuelle Buecher1,5, Conrad Sparks2,5, Andrew Brierley3, Helen Boyer4 and Mark Gibbons5

1 Laboratoire D'océanographie Biologique Et Ecologie Du Plancton Marin, Cnrs/upmc 7076, Station Zoologique, B.P. 28, 06234 Villefranche-Sur-Mer, France; 2 Faculty Of Applied Sciences, Cape Technikon, P.O. Box 652, Cape Town 8000, South Africa; 3 British Antarctic Survey, Biological Sciences Division, High Cross, Madingley Road, Cambridge, Cb3 0et, Uk; 4 National Marine Information And Research Centre, P.O. Box 912, Swakopmund, Namibia

5 Present Address: Zoology Department, University Of The Western Cape, Private Bag X17, Bellville 7535, South Africa; EBUECHER{at}MCM.WCAPE.GOV.ZA

Novel data on the biometry, size distribution and parasites of Aequorea aequorea and Chrysaora hysoscella are provided from investigations conducted during summer and winter in the northern Benguela ecosystem. The relationship between mass and diameter of C. hysoscella did not change on a seasonal basis, and this possibly reflects the aseasonal nature of the food environment. The changes in the size structure of C. hysoscella across the shelf and with depth agree with postulated population maintenance strategies in the region. Aequorea aequorea was not strongly parasitized, butC. hysoscella was subject to occasional parasitism by Hyperia medusarum, especially in winter when C. hysoscella is thought to reproduce. Parasites were distributed in a typical, negative-binomial manner on their hosts, but load was independent of host size. As medusae increased in diameter so H. medusarum tended to move from other tissues to the gonads.


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