Ecological animal geography; an authorized, Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage ecologicalanimal00hess Year: 1937 SWAMPS AND SHORES 477 most important, element, which take advantage of this seasonal food supply. The birds may be attracted also by the relative absence of enemies and the protection from such as are present which is afforded by the bog habitat. The permanent inhabitants of the tundra zone are discussed below (p. 505). There is an almost complete absence of semi- Fig. 122.—Jagana, Parra jacana, of So
Ecological animal geography; an authorized, Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage ecologicalanimal00hess Year: 1937 SWAMPS AND SHORES 477 most important, element, which take advantage of this seasonal food supply. The birds may be attracted also by the relative absence of enemies and the protection from such as are present which is afforded by the bog habitat. The permanent inhabitants of the tundra zone are discussed below (p. 505). There is an almost complete absence of semi- Fig. 122.—Jagana, Parra jacana, of South America. After Plate. aquatic mammals, since there is no refuge from the severity of winter for them. Vertebrate life of the sea coast.—The transition from sea to dry land in tide flats, salt marshes, and, in the tropics, mangrove swamps and forests, offers a third semi-aquatic habitat, much frequented by the types of birds and mammals already discussed, but with a reduced reptile fauna and with amphibians almost totally absent. In the mangrove swamps of Florida, for example, one finds the brackish-water fiddler crabs, Uca, abundant. To the south, these are replaced by the West Indian land crabs which burrow into the muddy
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