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Short cyst-dormancy period of an Australian isolate of the toxic dinoflagellate Alexandrium catenella


Hallegraeff, GM and Marshall, JA and Valentine, JP and Hardiman, S, Short cyst-dormancy period of an Australian isolate of the toxic dinoflagellate Alexandrium catenella, Marine Freshwater Research, 49, (5) pp. 415-420. ISSN 1323-1650 (1998) [Refereed Article]

DOI: doi:10.1071/MF97264


Cyst beds of Alexandrium catenella (a causative organism of Paralytic Shellfish Poisoning) are widespread in New South Wales coastal and estuarine waters (temperature range 13-25°C). Cysts produced by cultured isolates exhibited dormancy periods at 17°C as short as 28-55 days. This contrasts with the usually longer dormancy requirements of temperate populations of A. catenella from Japan (97 days at 23°C) and of A. tamarense from Cape Cod or British Columbia. With some Australian cysts, a 1-h temperature increase from 17°to 25°C (equivalent to summer heating of shallow estuaries) improved germination success (up to 100% germination achieved after 98 days), but cold-dark storage did not produce the lengthened dormancy requirements that have been reported overseas for overwintering temperate cyst populations. The significance of this finding is that different geographic isolates of the same dinoflagellate taxon can have different cyst dormancy requirements which play different ecological roles (overwintering strategy v. rapid cycling between benthos and plankton).

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Plant biology
Research Field:Phycology (incl. marine grasses)
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - aquaculture
Objective Field:Fisheries - aquaculture not elsewhere classified
UTAS Author:Hallegraeff, GM (Professor Gustaaf Hallegraeff)
UTAS Author:Marshall, JA (Dr Judith Marshall)
UTAS Author:Valentine, JP (Dr Joseph Valentine)
ID Code:14966
Year Published:1998
Web of Science® Times Cited:51
Deposited By:Plant Science
Deposited On:1998-08-01
Last Modified:2011-08-09

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