Multiple cosmopolitan ecotypes within a microbial eukaryote morphospecies

Finlay, Bland J.; Esteban, Genoveva F.; Brown, Susan; Fenchel, Tom; Hoef-Emden, Kerstin. 2006 Multiple cosmopolitan ecotypes within a microbial eukaryote morphospecies. Protist, 157. 377-390.

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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.

Item Type: Publication - Article
Digital Object Identifier (DOI):
Programmes: CEH Programmes pre-2009 publications > Biodiversity
UKCEH and CEH Sections/Science Areas: _ Population & Conservation Ecology
ISSN: 1434-4610
Additional Keywords: ciliate, cosmopolitan, ecotype, morphospecies
NORA Subject Terms: Biology and Microbiology
Ecology and Environment
Date made live: 30 Apr 2008 08:28 +0 (UTC)

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