Reproductive compatibility among four global populations of the toxic dinoflagellate Gymnodinium catenatum (Dinophyceae)
- 1 January 2001
- journal article
- Published by Taylor & Francis in Phycologia
- Vol. 40 (1) , 78-87
- https://doi.org/10.2216/i0031-8884-40-1-78.1
Abstract
Reproductive compatibility was examined among 21 strains of Gymnodinium catenatum derived from four different populations from across the globe: Tasmania, Australia (15 strains), Japan (2 strains), Spain (2 strains) and Portugal (2 strains). Pairwise crossing of strains demonstrated extensive intrapopulation compatibility (to resting cyst formation) among all four populations. The observations were most consistent with a heterothallic, multiple-group mating system, requiring more than two groups to explain the pairwise crossing data. Despite the ability of strains from different populations to produce resting cysts, the viability of progeny was highly variable among interpopulation crosses. Cysts from all crosses showed a high germination percentage (93–100%) and released a swimming planomeiocyte. Crosses between different Tasmanian strains, and those between Spanish and Japanese strains, showed high post-meiotic viability (65% and 80%, respectively). However, progeny from Tasmanian–Spanish and T...Keywords
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