Abstract:
:The increase in the areal extent of the subtropical gyres over the past decade has been attributed to a global tendency towards increased water-column stratification. Here, we examine how vertical stratification governs the community structure of the picophytoplankton that dominate these vast marine ecosystems. We analysed phytoplankton community composition in the three Southern Subtropical basins of the Pacific, Indian and Atlantic Oceans using a variety of methods and show that the distributions of picocyanobacteria and photosynthetic picoeukaryotes (PPEs) are strongly correlated with depth and strength of vertical mixing: the changes in community structure occur at various taxonomic levels. In well-mixed waters, PPEs, in particular haptophytes, dominate, whereas in strongly stratified waters, picocyanobacteria of the genus Prochlorococcus are prevalent, regardless of whether the relative contributions to total biomass are assessed in terms of pigment or of carbon. This ecological diochotomy within the picophytoplankton supports the hypothesis that genomic streamlining provides a selective advantage for Prochlorococcus in highly stable, oligotrophic systems, but may restrict their ability to dominate in regions subject to dynamic mixing.
journal_name
Environ Microbiol Repjournal_title
Environmental microbiology reportsauthors
Bouman HA,Ulloa O,Barlow R,Li WK,Platt T,Zwirglmaier K,Scanlan DJ,Sathyendranath Sdoi
10.1111/j.1758-2229.2011.00241.xsubject
Has Abstractpub_date
2011-08-01 00:00:00pages
473-82issue
4issn
1758-2229journal_volume
3pub_type
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