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Comparative study of Gymnodinium mikimotoi and Gymnodinium aureolum , comb. nov. (= Gyrodinium aureolum ) based on morphology, pigment composition, and molecular data
Author(s) -
Hansen Gert,
Daugbjerg Niels,
Henriksen Peter
Publication year - 2000
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1046/j.1529-8817.2000.99172.x
Subject(s) - gymnodinium , biology , dinophyceae , botany , ecology , phytoplankton , nutrient
Light and electron microscopy, nuclear‐encoded LSU rDNA sequences, and pigment analyses were performed on five geographically separate isolates of Gymnodinium mikimotoi. The morphological variation between the isolates equals that found within the isolates. The nuclear‐encoded LSU rDNA sequences were nearly identical in all isolates, and molecular analyses using maximum likelihood, parsimony, and neighbor joining showed the geographical isolates as an unresolved clade. Based on the available data it is concluded that the European isolates, formerly identified as Gyrodinium aureolum , Gyrodinium cf. aureolum , or Gymnodinium cf. nagasakiense , are conspecific with the Japanese Gymnodinium mikimotoi. An isolate from the Pettaquamscutt River, USA, is suggested to represent what Hulburt (1957) described as Gyrodinium aureolum. The LSU rDNA sequence data and ultrastructural characters in this isolate closely resemble those of Gymnodinium fuscum , the type species of Gymnodinium , and Gyrodinium aureolum Hulburt is therefore renamed Gymnodinium aureolum (Hulburt) G. Hansen, comb. nov.