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Showing 1 to 20 of 29 for “"Alexandrium"”.
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Phylogeny and biogeography of the toxic dinoflagellate Alexandrium
… and geographic range of PSP toxin-producing Alexandrium dinoflagellates explains the increase in PSP, but the reasons for changes in Alexandrium occurrence are unknown. This thesis explores the phylogeny, taxonomy, and biogeography of Alexandrium in light of this recent expansion. Alexandrium …
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Functional genomics of a non-toxic Alexandrium lusitanicum culture
… Many species in the dinoflagellate genus Alexandrium have been shown to produce these toxins. Here I report the first case of a culture of Alexandrium that has completely lost the ability to produce saxitoxins. The loss of toxicity was accompanied by a reduction in growth capability. A …
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Functional genomics of a non-toxic Alexandrium lusitanicum culture
… Many species in the dinoflagellate genus Alexandrium have been shown to produce these toxins. Here I report the first case of a culture of Alexandrium that has completely lost the ability to produce saxitoxins. The loss of toxicity was accompanied by a reduction in growth capability. A …
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Life cycle studies of the red tide dinoflagellate species complex Alexandrium tamarense
… within the algal dinoflagellate species complex Alexandrium tamarense may cause Paralytic Shellfish Poisoning, a significant and growing environmental threat worldwide. However, blooms of closely related nontoxic A. tamarense also occur, sometimes in close geographical proximity to toxic blooms. …
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Dynamics and impacts of toxic Alexandrium catenella blooms in the Pacific Arctic
… Of particular concern is the dinoflagellate Alexandrium catenella, a cystforming species that produces a potent suite of paralytic shellfish toxins (PSTs). In this thesis, Pacific Arctic bloom dynamics are explored in the context of the meroplanktonic life cycle of Alexandrium, revealing the …
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Mating interactions of the harmful dinoflagellate alexandrium tamarense from UK coastal waters
The Alexandrium tamarense species complex is a group of economically and ecologically important marine dinoflagellates. The complex is comprised of three morphospecies A. tamarense, A. fundyense and A. catenella grouped according to ribosomal DNA or ‘ribotype’. There are five ribotype type groups …
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Life cycle studies of the red tide dinoflagellate species complex Alexandrium tamarense
… within the algal dinoflagellate species complex Alexandrium tamarense may cause Paralytic Shellfish Poisoning, a significant and growing environmental threat worldwide. However, blooms of closely related nontoxic A. tamarense also occur, sometimes in close geographical proximity to toxic blooms. …
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Physiological and behavioral diagnostics of nitrogen limitation for the toxic dinoflagellate Alexandrium fundyense
… (RAB) species such as the toxic dinoflagellate Alexandrium fundyense which typically inhabit coastal regions where they are not usually dominant. Within the Gulf of Maine, environmental factors, specifically nitrogen, are likely to be a controlling factor for A. fundyense blooms. Therefore, the …
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Cell cycle dynamics and the physiology of saxitoxin biosynthesis in Alexandrium fundyense (Dinophyceae)
… in marine dinoflagellates of the genus Alexandrium is still unknown. The aim of this thesis was to analyze novel aspects of toxigenesis during the cell cycle in Alexandrium and to apply molecular techniques to gain new insights on the genetics and regulation of STX biosynthesis. …
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Cell cycle dynamics and the physiology of saxitoxin biosynthesis in Alexandrium fundyense (dinophyceae)
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Biology, 1998.
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Physiological and behavioral diagnostics of nitrogen limitation for the toxic dinoflagellate Alexandrium fundyense
Thesis (Ph. D.)--Joint Program in Biological Oceanography (Massachusetts Institute of Technology, Dept. of Ocean Engineering; and the Woods Hole Oceanographic Institution), February 2001.
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Analysis of toxic and non-toxic Alexandrium (Dinophyceae) species using ribosomal RNA gene sequences
… RNA genes (rDNA) from the marine dinoflagellates Alexandrium tamarense, A. catenella, A. fundyense, A. affine, A. minutum, A. lusitanicum and A. andersoni were compared to assess the organisms' relationships. Cultures represent isolates from North America, Western Europe, Thailand, Japan, …
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The interaction of two coastal plumes and its effect on the transport of Alexandrium fundyense
Harmful algal blooms (HABs) of A. fundyense, more commonly known as "red tides", are a serious economic and public health concern in the Gulf of Maine. Until recently, there was very little known about the mechanisms regulating the observed spatial and temporal distributions of A. fundyense in this …
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Alexandrium catenella cyst dynamics in a coastal embayment : temperature dependence of dormancy, germination, and bloom Initiation
Blooms of the dinoflagellate Alexandrium catenella cause paralytic shellfish poisoning syndrome and present an expanding public health threat. They are inoculated through the germination of benthic cysts, a process regulated by internal and environmental factors, most importantly temperature. Less …
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Alexandrium catenella cyst dynamics in a coastal embayment : temperature dependence of dormancy, germination, and bloom initiation
Blooms of the dinoflagellate Alexandrium catenella cause paralytic shellfish poisoning syndrome and present an expanding public health threat. They are inoculated through the germination of benthic cysts, a process regulated by internal and environmental factors, most importantly temperature. Less …
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Blooms of the toxic dinoflagellate Alexandrium fundyense in the Gulf of Maine : investigations using physical-biological model
Blooms of the toxic dinoflagellate Alexandriumfundyense are annually recurrent in the western Gulf of Maine (WGOM) and pose a serious economic and public health threat. Transitions between and vital rates within the life stages of A. fundyense are influenced by diverse environmental factors, and …
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Blooms of the toxic dinoflagellate Alexandrium fundyense in the Gulf of Maine : investigations using physical-biological model
Blooms of the toxic dinoflagellate Alexandrium fundyense are annually recurrent in the western Gulf of Maine (WGOM) and pose a serious economic and public health threat. Transitions between and vital rates within the life stages of A. fundyense are influenced by diverse environmental factors, and …
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The competitive dynamics of toxic and non-toxic ribotypes of the harmful dinoflagellate Alexandrium tamarense in Scottish waters
… non-saxitoxin producing (Group III) ribotypes of Alexandrium tamarense are present in Scottish waters, co-occurring in some locations. Shellfish toxicity events may have been in decline in recent years, possibly<br/>due to increasing presence of the benign Group III ribotypes. This thesis …
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Phenotypic diversity within two toxic dinoflagellate genera : environmental and transcriptomic studies of species diversity in Alexandrium and Gambierdiscus
… ecosystems health. Two dinoflagellate genera, Alexandrium and Gambierdiscus each contain species that can cause human poisoning syndromes, although the methods of toxin transfer, accumulation, and exposure are very different. Gambierdiscus is a benthic organism that produces lipophilic …
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Initial assessment of triplex PCR assay application for detection of toxic dinoflagellates, Alexandrium species (Dinophyceae), in environmental samples
… designed from phylogenetic studies on local Alexandrium populations, was optimised for application to environmental samples and tested against natural assemblages containing Alexandrium minutum. Specific positive results were consistently generated for samples containing A. minutum. Samples …
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