title: Morphological and physiological characteristics of Gephyrocapsa oceanica var. typica Kamptner 1943 in culture experiments: evidence for genotypic variability.
abstract: In order to test whether morphological variations within Gephyrocapsa oceanica var. typica Kamptner 1943 reflect genotypic variation or phenotypic responses to environmental conditions, culture experiments of six strains of G. oceanica collected at different locations in the North Atlantic and Mediterranean have been carried out under different temperature and nutrients conditions. All morphological, and physiological data suggest the presence of two species or subspecies within G. oceanica var typica that correspond morphologically to Gephyrocapsa "Larger" and possibly to Gephyrocapsa "Equatorial" as previously defined from Holocene sediments. Given the importance of Gephyrocapsa species for the carbon cycle in the past, genetic studies on this group are of major interest to the understanding of past climate change and plankton evolution.
authors.affiliation: Department of Geology, Earth Sciences Centre, University of Toronto, 22 Russell Street, Toronto, Ontario, Canada M5S 3B1. bollmann@geology.utoronto.ca
authors.forename: Jörg
authors.initials: J
authors.lastname: Bollmann
authors.forename: Christine
authors.initials: C
authors.lastname: Klaas
authors.forename: Larry E
authors.initials: LE
authors.lastname: Brand
mesh_terms: D000818:Animals; D001267:Atlantic Ocean; D003470:Culture Media / Q000737:chemistry; D056890:Eukaryota / Q000145:classification / Q000166:cytology* / Q000302:isolation & purification / Q000502:physiology*; D014644:Genetic Variation; D008522:Mediterranean Sea; D012623:Seawater / Q000469:parasitology*; D013696:Temperature
chemical_list: D003470:Culture Media