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Temporal Changes in Population Structure of a Marine Planktonic Diatom

Tesson, Sylvie LU ; Montresor, Marina; Procaccini, Gabriele and Kooistra, Wiebe (2014) In PLoS One 9(12). p.114984-114984
Abstract
A prevailing question in phytoplankton research addresses changes of genetic diversity in the face of huge population sizes and apparently unlimited dispersal capabilities. We investigated population genetic structure of the pennate planktonic marine diatom Pseudo-nitzschia multistriata at the LTER station MareChiara in the

Gulf of Naples (Italy) over four consecutive years and explored possible changes over seasons and from year to year. A total of 525 strains were genotyped using seven microsatellite markers, for a genotypic diversity of 75.05%, comparable to that found in other Pseudo-nitzschia species. Evidence from Bayesian clustering

analysis (BA) identified two genetically distinct clusters, here interpreted as... (More)
A prevailing question in phytoplankton research addresses changes of genetic diversity in the face of huge population sizes and apparently unlimited dispersal capabilities. We investigated population genetic structure of the pennate planktonic marine diatom Pseudo-nitzschia multistriata at the LTER station MareChiara in the

Gulf of Naples (Italy) over four consecutive years and explored possible changes over seasons and from year to year. A total of 525 strains were genotyped using seven microsatellite markers, for a genotypic diversity of 75.05%, comparable to that found in other Pseudo-nitzschia species. Evidence from Bayesian clustering

analysis (BA) identified two genetically distinct clusters, here interpreted as populations, and several strains that could not be assigned with $90% probability to either population, here interpreted as putative hybrids. Principal Component Analysis (PCA) recovered these two clusters in distinct clouds with most of the putative hybrids located in-between. Relative proportions of the two populations and the putative hybrids remained similar within years, but changed radically between 2008 and 2009 and between 2010 and 2011, when the 2008-population

apparently became the dominant one again. Strains from the two populations are inter-fertile, and so is their offspring. Inclusion of genotypes of parental strains and their offspring shows that the majority of the latter could not be assigned to any of the two parental populations. Therefore, field strains classified by BA as the

putative hybrids could be biological hybrids. We hypothesize that P. multistriata population dynamics in the Gulf of Naples follows a meta-population-like model, including establishment of populations by cell inocula at the beginning of each growth season and remixing and dispersal governed by moving and mildly turbulent

water masses. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
in
PLoS One
volume
9
issue
12
pages
114984 - 114984
publisher
Public Library of Science
external identifiers
  • Scopus:84918540767
ISSN
1932-6203
DOI
10.1371/journal.pone.0114984
language
English
LU publication?
no
id
fe27aa96-ebf2-4914-b39f-43c776ba398e (old id 8771165)
date added to LUP
2016-02-25 15:39:13
date last changed
2016-12-04 04:40:32
@misc{fe27aa96-ebf2-4914-b39f-43c776ba398e,
  abstract     = {A prevailing question in phytoplankton research addresses changes of genetic diversity in the face of huge population sizes and apparently unlimited dispersal capabilities. We investigated population genetic structure of the pennate planktonic marine diatom Pseudo-nitzschia multistriata at the LTER station MareChiara in the<br/><br>
Gulf of Naples (Italy) over four consecutive years and explored possible changes over seasons and from year to year. A total of 525 strains were genotyped using seven microsatellite markers, for a genotypic diversity of 75.05%, comparable to that found in other Pseudo-nitzschia species. Evidence from Bayesian clustering<br/><br>
analysis (BA) identified two genetically distinct clusters, here interpreted as populations, and several strains that could not be assigned with $90% probability to either population, here interpreted as putative hybrids. Principal Component Analysis (PCA) recovered these two clusters in distinct clouds with most of the putative hybrids located in-between. Relative proportions of the two populations and the putative hybrids remained similar within years, but changed radically between 2008 and 2009 and between 2010 and 2011, when the 2008-population<br/><br>
apparently became the dominant one again. Strains from the two populations are inter-fertile, and so is their offspring. Inclusion of genotypes of parental strains and their offspring shows that the majority of the latter could not be assigned to any of the two parental populations. Therefore, field strains classified by BA as the<br/><br>
putative hybrids could be biological hybrids. We hypothesize that P. multistriata population dynamics in the Gulf of Naples follows a meta-population-like model, including establishment of populations by cell inocula at the beginning of each growth season and remixing and dispersal governed by moving and mildly turbulent<br/><br>
water masses.},
  author       = {Tesson, Sylvie and Montresor, Marina and Procaccini, Gabriele and Kooistra, Wiebe},
  issn         = {1932-6203},
  language     = {eng},
  number       = {12},
  pages        = {114984--114984},
  publisher    = {ARRAY(0xb7d0b40)},
  series       = {PLoS One},
  title        = {Temporal Changes in Population Structure of a Marine Planktonic Diatom},
  url          = {http://dx.doi.org/10.1371/journal.pone.0114984},
  volume       = {9},
  year         = {2014},
}