Life in Lakes and Rivers by T. T. Macan, Edgar Barton Worthington

By T. T. Macan, Edgar Barton Worthington

One of many MANY issues MADE by way of lecturers OF ECOLOGY IS THAT THE ANIMAL AND PLANT neighborhood should be without problems STUDIED IN A POND OR LAKE. comprises forty five colour images, AND 20 MAPS AND DIAGRAMS

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He then devised a model which demonstrated the explanation in a very convincing way. It represented the longitudinal section of a lake enclosed between two sheets of plate glass. Two wires ran the length of the section near the surface, and an electric current passed through them warmed the adjacent water to create an epilimnion. A dye was carefully run into this to mark it. A gale was created by two blowers originally designed to dry ladies’ hair. Water is so heavy that a real gale tilts the water surface so little that only the most sensitive apparatus records a rise in level at the leeward end, but the thermocline tilts considerably.

The Burton well-water is included as a curiosity which may be of interest to beer drinkers; it has an unusually large number of radicles present in high or relatively high concentration. The permanent hardness of Burton water is due to gypsum – calcium sulphate. A chloride content higher than usual is commonly due to spray from the sea, to wind-blown sea-sand, or to pollution. In inland areas well away from any maritime influence the chloride content is often examined as a routine part of the test for pollution.

It may be objected that some animals floating in the open sea attain a large size. In comparison with the sea most bodies of fresh water are very small and fishes feeding on the larger animals on the bottom in shallow water could easily make excursions to prey on any large organism that developed in the open water. Most of the sea is so far from land that this cannot happen, and predators and prey must develop in balance together. One representative of that enterprising group the insects inhabits open water, and provides one of the most remarkable examples of adaptation that the animal kingdom has to show.

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