Does the cosmopolitan diatom Gomphonema parvulum (Kützing) Kützing have a biogeography?
Diatom cultures of the G. parvulum species complex were established from seven different sites in the Faroe Islands, Sweden, Germany, Mexico and Korea, and were studied in detail. Eight morphodemes were identified which corresponded to the descriptions of the cosmopolitan taxon G. parvulum (Kützing) Kützing sensu lato: its nominate variety (var. parvulum), G. parvulum var. exilissimum Grunow and G. parvulum f. saprophilum Lange-Bertalot & Reichardt, G. [parvulum var.] lagenula Kützing plus four unidentifiable morphodemes. The concatenated analysis of the sequences of the markers 18SV4, rbcL, and ITS as well as morphological data resulted in a separation of four taxa based on their biogeography in Mexico, Korea, central Continental Europe and Northern Atlantic Europe. Mantel tests showed a significant correlation between molecular and geographical distances. The diagnoses of two taxa, G. parvulum sensu stricto, and G. lagenula, were emended, G. saprophilum elevated to species rank and epitypes designated. One species was newly described.
Botanischer Garten und Botanisches Museum Berlin-Dahlem, Freie Universität Berlin, Berlin, Germany.
Nelida
N
Abarca
Botanischer Garten und Botanisches Museum Berlin-Dahlem, Freie Universität Berlin, Berlin, Germany.
Regine
R
Jahn
Botanischer Garten und Botanisches Museum Berlin-Dahlem, Freie Universität Berlin, Berlin, Germany ; AG Spezielle Botanik, Justus-Liebig-Universität, Giessen, Germany.
Jonas
J
Zimmermann
Botanischer Garten und Botanisches Museum Berlin-Dahlem, Freie Universität Berlin, Berlin, Germany.
Neela
N
Enke
D021901:DNA, Intergenic / Q000145:classification* / Q000235:genetics; D017377:Diatoms / Q000145:classification* / Q000235:genetics / Q000648:ultrastructure; D005060:Europe; D005819:Genetic Markers; D008800:Mexico; D008855:Microscopy, Electron, Scanning; D010802:Phylogeny; D058974:Phylogeography; D056910:Republic of Korea; D012273:Ribulose-Bisphosphate Carboxylase / Q000145:classification* / Q000235:genetics
D021901:DNA, Intergenic; D005819:Genetic Markers; C101625:RbcL protein, plastid; D012273:Ribulose-Bisphosphate Carboxylase