Abstract
(1) Hodson's Tarn in north-west England, c. 0 5 ha in extent and 3 m deep at the maximum, lies in rocky moorland used for little except plantations of Picea and Larix. Observations have been made on fifteen species of macrophytes in the period 1955-76. (2) There has not been a progressive seral change in the vegetation. (3) Details are given of marked fluctuations in the abundance of the three most frequent species: Myriophyllum alterniflorum, Littorella uniflora and Carex rostrata. (4) Other less frequent species have changed position (Potamogeton natans), fluctuated in abundance (Juncus fluitans and Nitella flexilis), disappeared (Alisma plantagoaquatica and Glyceria fluitans), or invaded and expanded (Potamogeton alpinus). (5) It is suggested that these changes are related to the amount of plant remains added to the soil each year and the rate of its decomposition.
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