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Mating compatibility and encystment characteristics of Alexandrium catenella dinoflagellate strains from Chilean southern fjords


Mardones, JI and Bolch, C and Varela, D and Untari, L and Hallegraeff, GM, Mating compatibility and encystment characteristics of Alexandrium catenella dinoflagellate strains from Chilean southern fjords, Marine and Fresh-water Harmful Algae: Proceedings of the 16th International Conference on Harmful Algae, 27-31 October 2014, Wellington, New Zealand, pp. 159-162. ISBN 978-87-990827-5-9 (2015) [Refereed Conference Paper]

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Resting cysts play an important role in the origin and initiation of Alexandrium dinoflagellate blooms in different coastal environments. Alexandrium catenella causes major economic impacts for the Chilean shellfish and fish farm industries, but the environmental conditions that regulate the encystment timing and cyst production rate in the seasonally variable fjords are poorly understood. We investigated mating compatibility and genetic relationships among 10 Chilean strains of A. catenella Group l using rDNA-ITS and LSU-rDNA sequences. Strain crossing experiments in all possible pairwise combinations showed variable reproductive compatibility among strains with high compatibilities among northern (Los Lagos) and southern (Magallanes) but not central (AysÚn) strains. However, these mating differences were not reflected in the identical LSU-rDNA and rDNA-ITS sequences observed among the strains. Encystment was synchronized in all pairwise crosses, with cyst production starting 26 days and terminating 45 days after inoculation. Cyst production was variable among crosses ranging from 7▒1.3 to 316.9▒20.5 cysts ml-1. The successful pairwise crosses performed with strains from the northern Chilean fjords do not explain the low concentrations of cysts detected in this area. Instead, these low cyst concentrations might be the result of local circulation patterns leading to a net flux offshore.

Item Details

Item Type:Refereed Conference Paper
Keywords:fish killing algal blooms, Alexandrium catenella, mating compatibility, genetic analysis, encystment, Chilean fjords
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:Mardones, JI (Mr Jorge Mardones)
UTAS Author:Bolch, C (Associate Professor Christopher Bolch)
UTAS Author:Untari, L (Mrs Ludmilla Untari)
UTAS Author:Hallegraeff, GM (Professor Gustaaf Hallegraeff)
ID Code:103062
Year Published:2015
Funding Support:Australian Research Council (DP130102859)
Deposited By:IMAS Research and Education Centre
Deposited On:2015-09-17
Last Modified:2016-04-21
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