|Thalassiosira rotula and T. gravida: ecology and morphology|
Syvertsen, E.E. (1977). Thalassiosira rotula and T. gravida: ecology and morphology. Nova Hedwigia 54: 99-112
In: Nova Hedwigia. Borntraeger Gebrüder: Berlin; Stuttgart. ISSN 0029-5035, more
Environmental effects; Morphology (organisms); Organism morphology; Thalassiosira gravida Cleve, 1896 [WoRMS]; Thalassiosira rotula Meunier, 1910 [WoRMS]; Marine
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T. gravida and T. rotula were grown at three temperatures (3, 10, 17° C) and at two silicon concentrations (10 and 100 g-at Si/l). Additional experiments were made at 17° C and 500 g-at Si/l and at 3° C and 0.5 g-at Si/l. Valve morphology changed from that typical of T. rotula at 17 C to that typial of T. gravida at 3° C. Variation of the silicon content of the medium had only slight effects. The 'unevenly thickened' band of T. rotula is shown to be a broadened intercalary band with a septum, formed dependent on environmental conditions.