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Genetic and Physiological Diversity in the Diatom <i>Nitzschia inconspicua</i>
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- Laia Rovira
- Aquatic Ecosystems Institute for Food and Agricultural Research and Technology (IRTA) St. Carles de la Ràpita 43540 Catalonia Spain
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- Rosa Trobajo
- Aquatic Ecosystems Institute for Food and Agricultural Research and Technology (IRTA) St. Carles de la Ràpita 43540 Catalonia Spain
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- Shinya Sato
- Laboratory of Marine Bioscience Fukui Prefectural Univeristy 1‐1 Gauken‐Cho Obama City Fukui 917‐0003 Japan
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- David G. Mann
- Aquatic Ecosystems Institute for Food and Agricultural Research and Technology (IRTA) St. Carles de la Ràpita 43540 Catalonia Spain
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- Carles Ibáñez
- Aquatic Ecosystems Institute for Food and Agricultural Research and Technology (IRTA) St. Carles de la Ràpita 43540 Catalonia Spain
Bibliographic Information
- Published
- 2015-07-03
- Resource Type
- journal article
- Rights Information
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- http://onlinelibrary.wiley.com/termsAndConditions#vor
- DOI
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- 10.1111/jeu.12240
- Publisher
- Wiley
Search this article
Description
<jats:title>Abstract</jats:title><jats:p><jats:italic>Nitzschia inconspicua</jats:italic> is an ecologically important diatom species, which is believed to have a widespread distribution and to be tolerant to salinity and to organic or nutrient pollution. However, its identification is not straightforward and there is no information on genetic and ecophysiological diversity within the species. We used morphological, molecular (<jats:italic>rbc</jats:italic>L and <jats:styled-content style="fixed-case">LSU</jats:styled-content> D1–D3), ecophysiological and reproductive data to investigate whether <jats:italic>N. inconspicua</jats:italic> constitutes a single species with a broad ecological tolerance or two or more cryptic species with shared or different ecological preferences. Molecular genetic data for clones from upstream and deltaic sites in the Ebro River basin (Catalonia, Spain) revealed seven <jats:italic>N. inconspicua rbc</jats:italic>L + <jats:styled-content style="fixed-case">LSU</jats:styled-content> genotypes grouped into three major clades. Two of the clades were related to other <jats:italic>Nitzschia</jats:italic> and <jats:italic>Denticula</jats:italic> species, making <jats:italic>N. inconspicua</jats:italic> paraphyletic and suggesting the need for taxonomic revision. Most clones were observed to be automictic, exhibiting paedogamy, and so the biological species concept cannot be used to establish species boundaries. Although there were morphological differences among clones, we found no consistent differences among genotypes belonging to different clades, which are definable only through sequence data. Nevertheless, separating the genotypes could be important for ecological purposes because two different ecophysiological responses were encountered among them.</jats:p>
Journal
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- Journal of Eukaryotic Microbiology
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Journal of Eukaryotic Microbiology 62 (6), 815-832, 2015-07-03
Wiley
