Causes of diatom diversity in lake sediments / report by A.B. Viner
By: Viner, A.B.
Contributor(s): DSIR Marine and Freshwater, Taupo Research Laboratory. Taupo.Material type: BookSeries: Taupo Research Laboratory report: no. 132Publisher: Taupo, N.Z. : Taupo Research Laboratory, 1992Description: 17 leaves (various pagings) : illustrations (graphs, charts) ; 30 cm.Subject(s): DIATOMS | LAKES | LAKE SEDIMENTS | LAKE TAUPO | LAKE TIKITAPU | LAKE OKAREKA | LAKE ROTORUA | LAKE OKARO | LAKE ROTONGAIO | LAKE NGAHEWA
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|JOURNAL||WELLINGTON STACK||STACK NO. 132 1992||1||Available||J016728|
6 refs; 6 figs
"This report is provisional only and should not be quoted without consulting the author or Director"
This study is part of a long-term investigation concerning the limnological conditions favouring diatom over cyanobacterial growth, and vice versa. An inherent difficulty in such an investigation is the transitory nature of conditions in lakes which, because of growth lags, usually do not coincide with the times of algal numerical dominance. Sediment features offer a way around this difficulty because diatom frustules are well preserved in sediments, so that their depositional record through sediment cores is an integration of past limnological conditions. This report only concerns the diversity of diatoms in terms of total numbers of species as an indicator of ecological success. Proof of dominance over cyanobacteria cannot be established because the structure of cyanobacteria are not preserved in the sediments, and although their pigments are preserved to some degree, these cannot be calibrated easily against originally sedimented quantities. (auth.)