Ribosomal DNA sequence variation among sympatric strains of the Cyclotella meneghiniana complex (Bacillariophyceae) reveals cryptic diversity

Bánk Beszteri, E. Ács, Linda K. Medlin

Research output: Contribution to journalArticle

85 Citations (Scopus)

Abstract

Cyclotella meneghiniana Kützing is one of the most commonly found and intensively studied freshwater diatom species. However, it is considered taxonomically problematic because of its unusually wide ecological range and large frustule ultrastructural variation. As part of a study of morphological and genetic variation in this morphospecies, we surveyed nucleotide variation in the hypervariable D1/D2 regions of the 28S rDNA, in the ribosomal internal transcribed spacer region (containing ITS1, the 5.8S rDNA and ITS2) and in the 18S rDNA in a collection of 20 sympatric strains. High genetic variability and strong indications of genetic structure among the Cyclotella meneghiniana strains were found. Representatives of four genetically distinct - apparently reproductively isolated - groups were revealed among them. The random distribution of ITS variation within these four groups indicated that the genetic structure in Cyclotella meneghiniana can probably be explained by the presence of cryptic sexual species rather than by the lack of allogamous sexual reproduction. The morphological features traditionally used for species identification in this group cannot distinguish these putative cryptic species.

Original languageEnglish
Pages (from-to)317-333
Number of pages17
JournalProtist
Volume156
Issue number3
DOIs
Publication statusPublished - Nov 17 2005

Fingerprint

Cyclotella meneghiniana
Bacillariophyceae
Ribosomal DNA
ribosomal DNA
Genetic Structures
nucleotide sequences
Diatoms
Social Identification
genetic variation
Fresh Water
sexual reproduction
internal transcribed spacers
Reproduction
Nucleotides
nucleotides
sequence diversity

Keywords

  • Cryptic diversity
  • Cyclotella meneghiniana
  • Diatom
  • Microdiversity
  • rDNA

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Agricultural and Biological Sciences (miscellaneous)
  • Microbiology

Cite this

Ribosomal DNA sequence variation among sympatric strains of the Cyclotella meneghiniana complex (Bacillariophyceae) reveals cryptic diversity. / Beszteri, Bánk; Ács, E.; Medlin, Linda K.

In: Protist, Vol. 156, No. 3, 17.11.2005, p. 317-333.

Research output: Contribution to journalArticle

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