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Diversity of protists with special emphasis on chrysomonads: morphological and molecular diversity, distribution patterns and functional differentiation
Protistan diversity is tremendous. And it is largely understudied. Although the microbial sphere is the basis of all life and the driver of ecosystem functions, most attention is given to the organisms that one can observe with the bare eye. Therefore, the biology, the diversity and the functional differentiation of microbial eukaryotes is dramatically understudied. Many ecological hypotheses have not yet been tested for protists. The extent of protistan diversity and its relevance to ecosystems are largely unknown. Addressing protistan diversity ideally requires a comprehensive approach including alpha-taxonomy, phylogenetics, phylogeography and molecular diversity as well as functional and physiological diversity. This thesis aims at this broad interdisciplinary approach to protist biodiversity. Small colourless flagellates are among the most problematic protists as the scarceness of characters makes species identification questionable. Such small flagellates, specifically chrysomonads, are, therefore, a consequent starting point for investigating protistan diversity. As a detailed study of the cryptic diversity within small heterotrophic colourless chrysophytes, I reveal polyphyly within this group of organisms in this work and, thereby, set the ground for assessing their true diversity in the field based on molecular signatures. Addressing protistan distribution patterns again is usually restricted by a limited and scattered set of sampling sites. Based on an unequalled sample set focusing on European protist communities, I demonstrate differential occurrence patterns in different protistan metagroups among habitat types. Last but not least, the vast diversity of protists raises the question for their coexistence and potential functional differentiation. I address this last aspect with a metatranscriptomic approach, revealing the degree of functional redundancy within protistan communities. Thus, in this thesis I reveal protistan diversity starting from species delimitation to large scale patterns of ...
Diversity of protists with special emphasis on chrysomonads: morphological and molecular diversity, distribution patterns and functional differentiation
Protistan diversity is tremendous. And it is largely understudied. Although the microbial sphere is the basis of all life and the driver of ecosystem functions, most attention is given to the organisms that one can observe with the bare eye. Therefore, the biology, the diversity and the functional differentiation of microbial eukaryotes is dramatically understudied. Many ecological hypotheses have not yet been tested for protists. The extent of protistan diversity and its relevance to ecosystems are largely unknown. Addressing protistan diversity ideally requires a comprehensive approach including alpha-taxonomy, phylogenetics, phylogeography and molecular diversity as well as functional and physiological diversity. This thesis aims at this broad interdisciplinary approach to protist biodiversity. Small colourless flagellates are among the most problematic protists as the scarceness of characters makes species identification questionable. Such small flagellates, specifically chrysomonads, are, therefore, a consequent starting point for investigating protistan diversity. As a detailed study of the cryptic diversity within small heterotrophic colourless chrysophytes, I reveal polyphyly within this group of organisms in this work and, thereby, set the ground for assessing their true diversity in the field based on molecular signatures. Addressing protistan distribution patterns again is usually restricted by a limited and scattered set of sampling sites. Based on an unequalled sample set focusing on European protist communities, I demonstrate differential occurrence patterns in different protistan metagroups among habitat types. Last but not least, the vast diversity of protists raises the question for their coexistence and potential functional differentiation. I address this last aspect with a metatranscriptomic approach, revealing the degree of functional redundancy within protistan communities. Thus, in this thesis I reveal protistan diversity starting from species delimitation to large scale patterns of ...
Diversity of protists with special emphasis on chrysomonads: morphological and molecular diversity, distribution patterns and functional differentiation
Großmann, Lars (author) / Boenigk, Jens
2016-12-16
Theses
Electronic Resource
English
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