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Establishment of a Clonal Culture of Unicellular Conjugating Algae

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Isolation by Time During an Arctic Phytoplankton Spring Bloom.

Anna Tammilehto¹, Phillip C Watts², Nina Lundholm¹

¹Natural History Museum of Denmark, University of Copenhagen, Sølvgade 83S, Copenhagen K, 1307, Denmark.

The Journal of Eukaryotic Microbiology

|August 21, 2016

Summary

Arctic phytoplankton blooms are crucial for carbon flux. This study reveals that blooming behavior in Fragilariopsis cylindrus may actually promote genetic diversity within the population, despite changes in genetic structure over time.

Keywords:

Fragilariopsis cylindrus Diatom microsatellites population dynamics population genetics

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Establishment of Microbial Eukaryotic Enrichment Cultures from a Chemically Stratified Antarctic Lake and Assessment of Carbon Fixation Potential

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Published on: April 20, 2012

Area of Science:

Marine biology
Arctic ecology
Population genetics

Background:

The Arctic spring phytoplankton bloom, often dominated by diatoms, is vital for high-latitude carbon cycling.
Phytoplankton biomass can increase dramatically during blooms, but their impact on population genetics remains poorly understood.

Purpose of the Study:

To investigate the genetic composition and temporal dynamics of the diatom Fragilariopsis cylindrus during an Arctic spring bloom.
To understand how bloom progression influences genetic differentiation and diversity.

Main Methods:

Development and application of 13 novel microsatellite markers for Fragilariopsis cylindrus.
Quantification of genetic composition and temporal changes throughout the spring bloom in western Greenland.

Main Results:

Genetic differentiation (F_ST) decreased as the bloom progressed, with significant changes at the onset, indicating 'isolation by time'.
Genetic diversity (H_E) remained relatively stable despite fluctuations in cell concentration and genetic structure.
A novel pattern of genetic differentiation linked to bloom dynamics was observed.

Conclusions:

Blooming behavior in Fragilariopsis cylindrus may play a role in promoting population genetic diversity.
The study highlights 'isolation by time' as a key characteristic of Arctic phytoplankton bloom genetic structure.