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- W865861674 abstract "The Alexandrium tamarense species complex is a group of economically andecologically important marine dinoflagellates. The complex is comprised of threemorphospecies A. tamarense, A. fundyense and A. catenella grouped according toribosomal DNA or ‘ribotype’. There are five ribotype type groups (I-V) eachconsisting entirely of toxic or non-toxic isolates. Toxic isolates are associated withharmful algal blooms (HAB’s) due to their ability to produce powerful neurotoxins,which are responsible for outbreaks of paralytic shellfish poisoning in areas ofshellfish production.Sexual reproduction in A. tamarense has important implications for the initiation andtermination of HAB’s associated with these species. Resistant, long-livedhypnozygotes are formed during blooms through gamete fusion and deposited insediments. These hypnozygotes provide the source of inoculum of motile vegetativeA. tamarense cells in temperate zones during subsequent spring/summer blooms.This study provides further insight into the mating interactions between toxic GroupI and non-toxic Group III isolates primarily from UK coastal waters.Study of the effect of temperature on the mating interactions of A. tamarense Group Iand Group III in culture showed that temperature had a significant effect on bothgroups. Co-cultures of compatible Group III isolates showed a significant decrease(p<0.05) in hypnozygote yield at 15°C, compared to 20°C. In contrast the matingcompatibility of co-cultures of Group I isolates showed significant increase (p<0.05)at 15°C, compared to 20°C. Similar to other studies, compatible Group I and GroupIII isolates formed non-viable hybrid hypnozygotes in co-culture. Comparison of theaverage vigour of inbred Group I crosses and outbred Group I/III crosses suggest thatGroup I isolates are more likely to out-breed with a compatible Group III isolate. Afinding that may have significance in areas where the two groups co-occur.Preliminary data suggesting the presence of both Group I and Group III ribotypes insome isolates has been generated from a nested single cell PCR/qPCR protocol usinggroup specific primers. These data were compared to a dual probe whole cellfluorescent in situ hybridisation (whole cell FISH) assay of isolates. Whole cell FISHshowed no dual expression of ribosomal RNA. This suggests that some A. tamarenseGroup I and Group III isolates may have rDNA pseudogenes corresponding todifferent ribotypes. If correct this could have implications for the overestimation ofA. tamarense group diversity in natural populations when using rDNA sequences foridentification." @default.
- W865861674 created "2016-06-24" @default.
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- W865861674 date "2014-01-01" @default.
- W865861674 modified "2023-09-26" @default.
- W865861674 title "Mating interactions of the harmful dinoflagellate alexandrium tamarense from UK coastal waters" @default.
- W865861674 hasPublicationYear "2014" @default.
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