. Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage . Fig. 5.—Outline, average size, and shell thickness (heavy contour = thick shell) of five forms of Anodonta cygnea at their centers of distribution: a, forma typica; b, ; c, ; d, ; e, After Buchner. corals are famous for their diversification and adaptability, and their environmental conditions have such great variation that each indi- vidual branch may be subject to special conditions, and there are almost as many modificatio
. Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage . Fig. 5.—Outline, average size, and shell thickness (heavy contour = thick shell) of five forms of Anodonta cygnea at their centers of distribution: a, forma typica; b, ; c, ; d, ; e, After Buchner. corals are famous for their diversification and adaptability, and their environmental conditions have such great variation that each indi- vidual branch may be subject to special conditions, and there are almost as many modifications as Geographic isolation in inland waters.—Geographic isolation of small areas is especially characteristic of inland waters. A lake, a pond, a swamp, or a pool is surrounded by land as an island is by water. The great majority of inland lakes are small; less than 30 exceed 1000 sq. km. in extent, and many are very small. Rivers are separated by land at their sources, by the sea at their mouths, equally effective barriers for their fresh-water inhabitants. The environmental conditions, especially in standing waters, are extremely variable: the daily and seasonal temperature range; the dissolved substances, or- ganic and inorganic; the kind of bottom; the vegetation of the shores; all combine to give an individual character to almost every body of water, in sharp contrast with the uniformity of marine conditions.
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Keywords: ., bookcentury1900, bookcollectionbiodive, booksubjectanimalecology
