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Are We Overestimating Protistan Diversity in Nature?
1Department of Biological Sciences, 3616 Trousdale Parkway, University of Southern California, Los Angeles, CA 90089-0371, USA.
Trends in Microbiology
|November 21, 2018
Summary
Ecological studies of protists face challenges due to their diversity. DNA sequencing reveals that we are now uncovering microdiversity within protist species, not just new species.
Area of Science:
- Ecology
- Microbiology
- Genetics
Background:
- Documenting protistan diversity is challenging due to morphological limitations of species concepts.
- Integrating physiological and genetic data is crucial for a unifying protistan taxonomy.
- DNA sequencing has transformed the study of protistan diversity.
Purpose of the Study:
- To evaluate whether recent advances in DNA sequencing have moved beyond species-level diversity characterization.
- To investigate the potential for revealing intraspecies diversity in protists.
- To discuss the implications of discovering microdiversity in protistan lineages.
Main Methods:
- Analysis of recent field survey data focusing on DNA sequence information.
- Comparison of species richness trends derived from morphological versus molecular methods.
- Review of literature on protistan diversity studies.
Main Results:
- Exponential increase in sequence-based protistan species richness observed.
- Evidence suggests a shift from characterizing species-level diversity to revealing intraspecies diversity.
- This microdiversity is apparent in several protistan lineages.
Conclusions:
- Protistologists must acknowledge the discovery of intraspecies diversity (microdiversity).
- The documentation of microdiversity may be scientifically justified.
- Recognizing and addressing the consequences of microdiversity is essential for future protistan research.
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