Experimental diatom dissolution and the quantification of microfossil preservation in sediments

Palaeoecology: A tool to improve the management of Australian estuaries

“…Strategic site selection is critical for success as sediment record integrity may be disturbed by bioturbation and establishing a good chronology can be difficult (e.g., Crusius et al 2004). Poor preservation of microfossils (e.g., Ryves et al 2001) and the need to identify sediment origin such as the amount of allochthonous vs.…”

Potential limitations of biogenic silica as an indicator of abrupt climate change in Lake Baikal, Russia

“…That this situation exists is surprising given that BSi measurements have been fundamental in determining palaeoclimatic changes in Lake Baikal over glacial-interglacial cycles (Colman et al 1995(Colman et al , 1999Williams et al 1997). Furthermore, laboratory experiments and interglacial sections of Lake Baikal cores have previously demonstrated a close relationship between BSi and diatom populations (Williams et al 1997;Khursevich et al 2001;Ryves et al 2001;Karabanov et al 2004). However, with almost all BSi originating from diatoms, these results from two different sites, each analysed by different groups working on Lake Baikal suggests a clear problem in applying BSi measurements to glacial aged sediments.…”

A comparison of the Si/Al and Si/time wet-alkaline digestion methods for measurement of biogenic silica in lake sediments

“…2), an elevated plateau which shows 3/12 no evidence of sediment reworking in the Holocene or late glacial (Morley 2005). Whilst the validity of BSi concentrations as a measure of diatom productivity has been questioned in glacial-age samples from MIS 3/2, when diatom dissolution was extremely high (Swann and Mackay 2006), results of laboratory experiments (Ryves et al 2001) suggest that these issues should not apply to the samples analysed here where diatom dissolution is only low to moderate (Morley 2005;Rioual et al in prep).…”