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Physical barriers and environmental gradients cause spatial and temporal genetic differentiation of an extensive algal bloom
University of Gothenburg.
Åbo Akademi University, Finland.
Tallinn University of Technology, Estonia.
University of Gothenburg.
Show others and affiliations
2016 (English)In: Journal of Biogeography, ISSN 0305-0270, E-ISSN 1365-2699, Vol. 43, no 6, 1130-1142 p.Article in journal (Refereed) Published
Abstract [en]

Aim

To test if a phytoplankton bloom is panmictic, or whether geographical and environmental factors cause spatial and temporal genetic structure.

Location

Baltic Sea.

Method

During four cruises, we isolated clonal strains of the diatom Skeletonema marinoifrom 9 to 10 stations along a 1132 km transect and analysed the genetic structure using eight microsatellites. Using F-statistics and Bayesian clustering analysis we determined if samples were significantly differentiated. A seascape approach was applied to examine correlations between gene flow and oceanographic connectivity, and combined partial Mantel test and RDA based variation partitioning to investigate associations with environmental gradients.

Results

The bloom was initiated during the second half of March in the southern and the northern- parts of the transect, and later propagated offshore. By mid-April the bloom declined in the south, whereas high phytoplankton biomass was recorded northward. We found two significantly differentiated populations along the transect. Genotypes were significantly isolated by distance and by the south–north salinity gradient, which illustrated that the effects of distance and environment were confounded. The gene flow among the sampled stations was significantly correlated with oceanographic connectivity. The depletion of silica during the progression of the bloom was related to a temporal population genetic shift.

Main conclusions

A phytoplankton bloom may propagate as a continuous cascade and yet be genetically structured over both spatial and temporal scales. The Baltic Sea spring bloom displayed strong spatial structure driven by oceanographic connectivity and geographical distance, which was enhanced by the pronounced salinity gradient. Temporal transition of conditions important for growth may induce genetic shifts and different phenotypic strategies, which serve to maintain the bloom over longer periods.

Place, publisher, year, edition, pages
2016. Vol. 43, no 6, 1130-1142 p.
Keyword [en]
Adaptation, Environmental gradient, Gene flow, Genetic structure, Isolation by distance, Population, Seascape, Skeletonema
National Category
Ecology
Research subject
Ecology, Aquatic Ecology
Identifiers
URN: urn:nbn:se:lnu:diva-49736DOI: 10.1111/jbi.12722ISI: 000378711000006Scopus ID: 2-s2.0-84957818454OAI: oai:DiVA.org:lnu-49736DiVA: diva2:903228
Available from: 2016-02-15 Created: 2016-02-12 Last updated: 2016-12-07Bibliographically approved

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Bertos-Fortis, MireiaBunse, CarinaLegrand, Catherine
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CiteExportLink to record
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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
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More styles
Language
  • de-DE
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  • Other locale
More languages
Output format
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