Experimental investigations into the preservation of pollen grains: A pilot study of four pollen types

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Preservation condition of pollen grains from different sedimentary environments can be a useful tool for interpreting pollen assemblages, but current understanding of the controls on pollen preservation is limited. One constraint is the complexity of studying these processes in the natural system. This paper presents the results of a pilot study of laboratory assessments of damage processes. A standard mixture of dried pollen grains (4 taxa: Alnus, Secale, Dactylis and Ambrosia) was rehydrated and suspended in glycerine, then subjected to two types of treatment, chemical oxidation or agitation in water with added sand or pebbles. The treatments generated distinctive damage patterns, and the pattern of damage observed varies with duration of treatment, combinations of treatments and pollen taxon. The results suggest that laboratory methods, which can generate damaged pollen assemblages rapidly and under controlled conditions, are a useful route for investigating the processes controlling pollen degradation and therefore interpreting the damage spectra recorded from past assemblages in terms of environmental processes.