Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 428238
Title Evolution of nuclear rDNA ITSsequences in the Cladophora albida/sericea clade (Chlorophyta)
Author(s) Bakker, F.T.; Olsen, J.L.; Stam, W.T.
Source Journal of Molecular Evolution 40 (1995)6. - ISSN 0022-2844 - p. 640 - 651.
Department(s) Biosystematiek-Diertaxonomie
Publication type Refereed Article in a scientific journal
Publication year 1995
Abstract Ribosomal DNA ITS sequences were compared among 13 different species and biogeographic isolates from the monophyletic albida/sericea clade in the green algal genus Cladophora. Six distinct ITS sequence types were found, characterized by multiple insertions and deletions and high levels of nucleotide substitution. Conserved domains within the ITS regions indicate the presence of ITS secondary structure. Low transition/transversion ratios among the six types and nearly symmetrical tree-length frequency distributions indicate some saturation, and low phylogenetic signal. Although branching order among five of the six ITS sequence types could not be resolved, estimates of ITS sequence divergence as compared with 18S divergence in a subset of the taxa suggests that the origin of the different ITS types is probably in the mid-Miocene (12 Ma ago) but that biogeographic isolates within a single ITS type (including both Pacific and Atlantic representatives) have probably dispersed on a time scale of thousands rather than millions of years.
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