Palaeogenetics for Ostracods (Crustacea, Ostracoda)
Faculty of Sciences. Biology
Developments in quaternary sciences
, p. 297-304
We explore how molecular techniques can be applied to ostracod DNA to infer past climatic and environmental fluctuations at several time scales. Cladoceran DNA has been extracted from resting eggs up to several thousand years old but no such work on Ostracoda has yet been published. Ostracod eggs are not encased in large protective ephippia as in Cladocera, and only some are protected by thick walls. Collapsed eggs with thin walls will be more difficult to sort individually from sediments; direct extraction of DNA is likely to work only on thick-walled eggs, but could also be possible from juveniles hatched from eggs several hundred years old. The potential for direct extraction of DNA from fossils (valves, remnant soft parts) is considered. A potential method to infer large climate-induced effects on ancient lakes (e.g. large lake-level fluctuations) involves DNA analyses of extant populations, combining phylogenetic and population genetic (coalescent) techniques.