A new record of Craspedacusta sowerbii (Cnidaria: Limnomedusae) from southern Africa
1992; Taylor & Francis; Volume: 27; Issue: 3 Linguagem: Inglês
10.1080/02541858.1992.11448275
ISSN0254-1858
AutoresNancy A. Rayner, C.C. Appleton,
Tópico(s)Aquatic Ecosystems and Phytoplankton Dynamics
ResumoThe northern hemisphere Craspedacusta sowerbii has been recorded recently from temperate regions of South Africa. Its introduction to southern Africa is thought to have occurred in the 1940s, when a number of exotic species were introduced, associated with man's interference in river catchments. A new record from Theewaterskloof Dam, Cape Province, suggests that its spread is being facilitated by inter-basin translocation of the polyp stage. Histological analysis of the gonads of medusae from Theewaterskloof impoundment showed that they were all females, supporting the hypothesis that only one sex of medusa is budded from any one polyp colony.
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