Journal ArticleDOI
Genetic Variation in Symbiodinium (=Gymnodinium) microadriaticum Freudenthal, and Specificity in its Symbiosis with Marine Invertebrates. II. Morphological Variation in Symbiodinium microadriaticum
D. A. Schoenberg,R. K. Trench +1 more
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TLDR
Morphological studies conducted on axenic cultures of the endozoic gymnodinioid dinoflagellate Symbiodinium ( = Gymnodinium) microadriaticum demonstrated that there are intrinsic variations in the dimensions of the recently divided, but as yet unseparated, vegetative cells (the two-cell stage).Abstract:
Morphological studies conducted on axenic cultures of the endozoic gymnodinioid dinoflagellate Symbiodinium (= Gymnodinium) microadriaticum demonstrated that there are intrinsic variations in the dimensions of the recently divided, but as yet unseparated, vegetative cells (the two-cell stage). Characteristic dimensions of a given strain are maintained when such a strain is artificially introduced into a host other than that from which it was originally isolated. Ultrastructural observations illustrated that, in contrast to the algae in their hosts' tissues, the algae in culture produced a fibrous or granular \`pellicle' approximately 0.2 $\mu $m thick. The algae in situ in Tridacna gigas also demonstrated the presence of a \`pellicle', but this structure was reduced when compared to that produced by the same cells in culture. Many of the stages in the described life cycle of the alga were observed, with the exception of those stages involving gametogenesis and sexual reproduction. Two distinct types of zoospores were observed; those that contained an \`accumulation body' in the epicone and those that did not. 1. Endozoic gymnodinioid dinoflagellates isolated from 17 different invertebrate hosts were cultured axenically in ASP-8A under identical conditions of light and temperature. 2. Analysis of the dimensions of the two-cell stages of these algae showed that they fall into two significantly distinct size categories. 3. Observations of the zoospores showed that those of \`small' strains possessed an \`accumulation body' in the epicone, while those of \`large' strains did not. 4. Examination of the ultrastructure of the amphiesma of the algae in situ illustrated that this structure is greatly reduced. By contrast, the cells in culture produced a `pellicle' approximately 0.2 $\mu $m thick, within which binary fission, or the production of tetraspores or of zoospores may occur. 5. Transmission and scanning electron microscopy of the cells in culture illustrated that the algal varied with respect to surface architecture. Most cells were smooth, while cells from Zoanthus sociatus uniquely possessed tufts of hair-like fibres projecting from the surface of the amphiesma.read more
Citations
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Climate change, coral bleaching and the future of the world's coral reefs
TL;DR: The results suggest that the thermal tolerances of reef-building corals are likely to be exceeded every year within the next few decades, and suggests that unrestrained warming cannot occur without the loss and degradation of coral reefs on a global scale.
Journal ArticleDOI
Flexibility and Specificity in Coral-Algal Symbiosis: Diversity, Ecology, and Biogeography of Symbiodinium
Andrew C. Baker,Andrew C. Baker +1 more
TL;DR: Unusual symbionts normally found only in larval stages, marginal environments, uncommon host taxa, or at latitudinal extremes may prove critical in understanding the long-term resilience of coral reef ecosystems to environmental perturbation.
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Cell Biology of Cnidarian-Dinoflagellate Symbiosis
TL;DR: A comprehensive overview of the history of the cnidarian/coral-dinoflagellate symbiosis, its current status, and where it should be going in the future is provided.
Journal ArticleDOI
Investigating the biodiversity, ecology, and phylogeny of endosymbiotic dinoflagellates in the genus symbiodinium using the its region: in search of a “species” level marker
TL;DR: Findings indicate that some Symbiodinium species may have global biogeographic distributions and there is evidence, based on the lack of phylogenetic congruency with allelic variability, that sexual recombination occurs at some frequency among Symbiod inium populations.
Journal ArticleDOI
Diversity and community structure of symbiotic dinoflagellates from Caribbean coral reefs
TL;DR: A comparison of the symbiont types found in field-collected hosts with types previously cultured from these hosts indicates the existence of low density or "background"-symbiont populations and cryptic, potentially non-mutualistic types in some hosts.
References
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Journal ArticleDOI
Symbiodinium gen. nov. and Symbiodinium microadriaticum sp. nov., a Zooxanthella: Taxonomy, Life Cycle, and Morphology.*
TL;DR: As none of the existing genera of free-living or parasitic algae are wholly applicable to this organism, a new genus, Symbiodinium, is proposed and the type species, S. microadriaticum, is described.
Journal ArticleDOI
Genetic Variation in Symbiodinium (=Gymnodinium) microadriaticum Freudenthal, and Specificity in its Symbiosis with Marine Invertebrates. I. Isoenzyme and Soluble Protein Patterns of Axenic Cultures of Symbiodinium microadriaticum
D. A. Schoenberg,R. K. Trench +1 more
TL;DR: Symbiodinium (=Gymnodinium) microadriaticum Freudenthal, isolated from 40 host individuals (or colonies) representing 17 species in two phyla were resolved into 12 strains, each strain having a unique combination of four isoenzyme patterns as revealed by starch gel electrophoresis.
Journal ArticleDOI
Genetic Variation in Symbiodinium (=Gymnodinium) microadriaticum Freudenthal, and Specificity in its Symbiosis with Marine Invertebrates. III. Specificity and Infectivity of Symbiodinium microadriaticum
D. A. Schoenberg,R. K. Trench +1 more
TL;DR: Nine of 12 tested strains of the zooxanthella Symbiodinium (= Gymnodinium) microadriaticum can initiate symbiotic associations with an aposymbiotic clone of the sea anemone Aiptasia tagetes.
Journal ArticleDOI
Dinoflagellate Evolution: Speculation and Evidence*†
TL;DR: The presence of repeated and highly complex DNA, a S-phase of DNA synthesis in the cell cycle, presence of basic proteins, and the reinterpretation of extranuclear microtubules as a spindle support the contention that dinoflagellates are eukaryotes.
Journal ArticleDOI
Observations on the theca of the motile phase of free-living and symbiotic isolates of Zooxanthella microadriatica (Freudenthal) comb.nov.
TL;DR: A strain of Zooxanthella microadriatica (Freudenthal) comb has been isolated from decaying Chondrus crispus (L.) Stackh.nov.
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