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Multiple cosmopolitan ecotypes within a microbial eukaryote morphospecies.

Bland J Finlay1, Genoveva F Esteban, Susan Brown

  • 1Centre for Ecology and Hydrology, Winfrith Technology Centre, Winfrith Newburgh, Dorchester, Dorset DT2 8ZD, UK. bjf@ceh.ac.uk

Protist
|August 5, 2006
PubMed
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Genetic diversity within the ciliated protozoan Cyclidium glaucoma does not follow geographic patterns. While morphospecies are widespread, specific genetic clusters (ribotypes) show some habitat-specific distributions.

Area of Science:

  • Microbiology
  • Eukaryotic Genetics
  • Protistology

Background:

  • Morphologically similar microbial eukaryotes (morphospecies) often exhibit significant genetic variation.
  • Protist morphospecies are generally considered cosmopolitan, but genetic lineages (ribotypes) may possess distinct biogeographic distributions and adaptations.

Purpose of the Study:

  • To investigate the biogeography of genetic lineages within the ciliated protozoan morphospecies Cyclidium glaucoma.
  • To determine if distinct rRNA gene sequence clusters (ribotypes) of Cyclidium glaucoma correlate with specific environmental adaptations or geographic locations.

Main Methods:

  • Collected 54 isolates of Cyclidium glaucoma from diverse global locations.
  • Analyzed genetic variation using rRNA gene sequencing to identify distinct ribotypes.

Related Experiment Videos

  • Compared the geographic distribution of identified ribotypes.

    • Main Results:

    • Identified 31 distinct ribotypes among the 54 worldwide isolates of Cyclidium glaucoma.
    • Found no evidence of global biogeographic distribution patterns for Cyclidium glaucoma ribotypes.
    • Observed that identical ribotypes were found across continents and in disparate environments (e.g., freshwater, saline, hyperhaline).
    • Noted potential habitat-specific distributions for certain ribotype clusters (e.g., marine, hyperhaline, freshwater).

    Conclusions:

    • The morphospecies Cyclidium glaucoma exhibits a cosmopolitan distribution with extensive genetic diversity.
    • While global biogeography is not evident, some genetic clusters of Cyclidium glaucoma may be associated with specific salinity habitats.
    • Further research is needed to fully elucidate the ecological and evolutionary factors shaping the distribution of microbial eukaryote genetic diversity.