Abstract
Continuous records were made, for almost two years, of the water temperatures in two ponds in Leicestershire, England. The number of degree-hours and the weekly and monthly mean temperatures were calculated. The water temperature in the ponds and the factors influencing the temperatures were very different in the winter and summer. In the winter the water temperature was fairly uniform, only fluctuating slightly, and was influenced mainly by the air temperature. In the summer the water temperature was very variable within a pond and was mainly influenced by the amount of sunshine received. The range of temperature fluctuation and rate of change within a pond varied inversely with the depth of water, water cloudiness and the amount of plant growth. These internal factors had greatest effects in the summer when the influence of the sun was greatest. The effect of temperature on pond water animals is briefly discussed.
Published Version
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