By Richard Hesse, W. C. Allee, Karl P. Schmidt
Read or Download Ecological Animal Geography: an Authorized, Rewritten Edition Based on Tiergeographie auf Oekologischer Grundlage (1937) PDF
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Additional resources for Ecological Animal Geography: an Authorized, Rewritten Edition Based on Tiergeographie auf Oekologischer Grundlage (1937)
4 1 38 . 8 1 08 . 16 In Metazoa the kidneys play the same role in removing water taken in by osmosis. , from snail blood, an isotonic medium— it is usually difficult to recognize the bladder on account of its small extent. When the animal is immersed in tap water, — the Y-shaped bladder quickly becomes evident on account of its distention. This shows that the water diffused into the body is being re- moved by the nephridial system. Isopods, amphipods, and decapods of ENVIRONMENTAL CLASSIFICATION 35 fresh water agree in having the antennal excretory organ larger than marine relatives.
ENVIRONMENTAL SELECTION 31 Herbivorous reptiles are not numerous, but of the Galapagos Islands, where they do not suffer from mammalian competition, Darwin wrote: "The species are not numerous, but the numbers of individuals of when we remember the each species are extraordinarily great the many tortoises large thousands of well-beaten paths made by the (=ConoloAmblyrhynchus terrestrial ur tles the great warrens of and the groups of the marine species basking on the coast-rocks phus) . . " 19 Similar examples could be increased indefi- must be remembered that a large number of individuals is a correlative of a small number of species only when the conditions of food supply are especially favorable.
As in aquatic habitats, animal life is least abundant on land where the habitat conditions approach the limiting stantly * 1935. Independent estimates by L. O. Howard and A. E. Emerson; see also Pratt, 10 . ECOLOGICAL FOUNDATIONS OF ZOOGEOGRAPHY 28 values, as in deserts. high mountains, toward the poles, in steppes, or in The number of species of insects in India is 29,700 ; n Green- The number of species of animals land (half as large) has only 437. decreases steadily with increasing altitude on the mountains.
Ecological Animal Geography: an Authorized, Rewritten Edition Based on Tiergeographie auf Oekologischer Grundlage (1937) by Richard Hesse, W. C. Allee, Karl P. Schmidt