Morphology, valve ultrastructure and stratigraphical variability of Discostella taxa in a tropical crater lake, northern Tanzania
2009 (English)In: Diatom Research, ISSN 0269-249X, Vol. 24, no 2, 341-356 p.Article in journal (Refereed) Published
Morphological and ultrastructural variability of Discostella Houk et Klee (Bacillariophyceae) valves from a small crater lake in northern Tanzania have been examined under scanning electron microscope (SEM) and light microscope (LM). Three types of Discostella are described; Discostella woltereckii, as well as a small variety of D. woltereckii denoted Discostella woltereckii var. minor Öberg, Risberg et Stabell and an unidentified species, Discostella sp. The diatom record during the last ~100 years is dominated by D. woltereckii and D. woltereckii var. minor. The lithology and diatom stratigraphy of a 36 cm sediment surface core show a period of low lake level with extensive aquatic vegetation from around AD 1600. Sometime around AD 1900 there is a substantial rise in the lake water level indicated by an increase in euplanktonic Aulacoseira ambigua and facultative planktonic Discostella spp.
Place, publisher, year, edition, pages
Bristol: Biopress Ltd, 2009. Vol. 24, no 2, 341-356 p.
Discostella, Valve ultrastructure, Tanzania, Lake Duluti, paleolimnology
Research subject Plant Morphology; Physical Geography
IdentifiersURN: urn:nbn:se:su:diva-31885ISI: 000271296500006OAI: oai:DiVA.org:su-31885DiVA: diva2:278896