AN ECOLOGICAL INVESTIGATION AT A JUNCTION BETWEEN TWO PLANT COMMUNITIES IN COOMBSDALE ON THE DERBYSHIRE LIMESTONE.

The article focuses on the number of species contributing to the vegetation of an upland grazing on Ffridd, Ddu, Aber in Caernarvonshire, Wales. The study uses an ordination approach technique in the analysis of some plant communities present on the upland grassland of Ffridd Ddu, Caernarvonshire, while the performance of individual plant species has been related to single axis of floristic variation which correlates well with similar single axis variation in some edaphic factors. Moreover, the particular technique of ordination used is described in detail and placed on the potential value of this approach in ecological analysis.