Genetic diversity in the moss Hennediella heimii in Miers Valley southern Victoria Land, Antarctica

The moss Hennediella heimii constitutes a significant proportion of the terrestrial flora of East Antarctica, especially in the McMurdo Dry Valleys region of southern Victoria Land. This is the first investigation of the extent of genetic variation within a population of H. heimii. Random Amplified Polymorphic DNA has been used to study both genetic diversity and dispersal of this moss in Miers Valley, southern Victoria Land. The results showed that genetic variation does occur in H. heimii (possibly due to increased exposure to UV-B irradiation), even between shoots within single colonies, and that colonies collected from three transects along meltstreams within the valley constitute a single large population. However, comparison with samples of the same species from nearby valleys and sites up to 500km distant showed that the Miers Valley population is distinct from these other populations. The results also indicate that wind plays a major role in dispersal of H. heimii in this region of Antarctica.[PUBLICATION ABSTRACT]