The Life of Inland Waters An Elementary Text book of Fresh Water Biology for Am
The Life of Inland Waters An Elementary Text book of Fresh Water Biology for Am
James George Needham
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It contains no producing class. It is sustained by the plancton and by the products of the shores. These fishes all have a splendid development of stream-line form. They all swim superbly. And according as they feed on plancton or on other fishes they are equipped with plancton strainers or with raptorial teeth. Excellent plancton strainers are those of the lake fishes. They are composed of the close-set gill-rakers on the front of the gill arches, and they strain the water passing through. Thi...s mesh is adapt- ed for straining the larger animal planctonts while let- ting the lesser chlorophyl-bearing forms slip thro. Thus the fishes reap the crop of animals that is matur- ed, without destroying the sources for a crop to come. LITTORAL SOCIETIES NDER the sheltering influence of shores the vascular plants may grow. Animals elude the eyes of their ene- mies, not by becom- ing transparent, but by taking on colors and forms in resemblance to their environment. They escape capture, not alone by fleet- ness, but also by development of defensive armor, by shelter-building and by burrowing.
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