Abstract
A Pembrokeshire river has been investigated periodically at six contrasting stations from source to estuary, during sixth-form and undergraduate field courses. Its transition from a cool, soft water, swiftly flowing headstream to a warmer, alkaline, sluggish and partly silted river is accompanied by changes in the macroflora and fauna. Modifications of water quality and aquatic communities since the study began, are related to man's activities in the river basin. The organization of the exercise and the methods employed are described. The results obtained are used to demonstrate an approach to presentation and discussions of the interrelationships between physico-chemical and biotic gradients.
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