AI Article Synopsis
- Microbial eukaryotes, specifically the ciliated protozoan Cyclidium glaucoma, show high genetic diversity among morphologically similar types called morphospecies, with 54 isolates revealing 31 distinct ribotypes.
- While these ribotypes were identified globally, they lacked distinct biogeographic patterns, as identical ribotypes were found in unrelated geographical locations.
- Some ribotype clusters indicate certain environmental adaptations, with specific clusters associated with marine, brackish, or hyperhaline habitats, while others are found in freshwater environments, suggesting some adaptability across different water types.
Article Abstract
Microbial eukaryotes that are morphologically indistinguishable (i.e. 'morphospecies') tend to be genetically diverse. While most protist morphospecies have cosmopolitan distribution, it has been suggested that ribotypes (unique rRNA gene sequences) or rRNA sequence clusters do have biogeography and such clusters may correlate with particular (non-morphological) adaptations. We have studied this in the ciliated protozoan morphospecies Cyclidium glaucoma. Fifty-four isolates collected worldwide represented 31 distinct ribotypes. There was no evidence of biogeographic distribution patterns. For example, identical ribotypes occurred in samples from Argentina, Peru, Morocco, Russia and Ukraine; in samples from Denmark and Australia; and in samples from Great Salt Lake and hyperhaline ponds in Spain. The morphospecies Cyclidium glaucoma is euryhaline and occurs in freshwater, brackish water, seawater, and hyperhaline waters. Evidence suggests that one ribotype cluster occurs only in marine or brackish habitats, and another one has so far been found only in hyperhaline habitats. Two clades seem to occur only in freshwater, but one clade includes ribotypes that were found in freshwater as well as in brackish water.
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| http://dx.doi.org/10.1016/j.protis.2006.05.012 | DOI Listing |
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Multiple cosmopolitan ecotypes within a microbial eukaryote morphospecies.
Protist
October 2006
Centre for Ecology and Hydrology, Winfrith Technology Centre, Winfrith Newburgh, Dorchester, Dorset DT2 8ZD, UK.
Article Synopsis
- Microbial eukaryotes, specifically the ciliated protozoan Cyclidium glaucoma, show high genetic diversity among morphologically similar types called morphospecies, with 54 isolates revealing 31 distinct ribotypes.
- While these ribotypes were identified globally, they lacked distinct biogeographic patterns, as identical ribotypes were found in unrelated geographical locations.
- Some ribotype clusters indicate certain environmental adaptations, with specific clusters associated with marine, brackish, or hyperhaline habitats, while others are found in freshwater environments, suggesting some adaptability across different water types.
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