. Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage . Fia. 108.—Caudal fork of Artemia salina from waters of varying salt content, near Odessa: a, from water of 8°; b, 14°; c, and d, 18°; e, °; and /, 25° Baume. After Schmankewitsch. ber of setae, form of the posterior end, etc. A large number of these changes are due to the influence of the salt content;43 since this is constantly changing in nature, reliable information concerning these phenomena can be obtained only by breeding experiments in water of constant concentration
. Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage . Fia. 108.—Caudal fork of Artemia salina from waters of varying salt content, near Odessa: a, from water of 8°; b, 14°; c, and d, 18°; e, °; and /, 25° Baume. After Schmankewitsch. ber of setae, form of the posterior end, etc. A large number of these changes are due to the influence of the salt content;43 since this is constantly changing in nature, reliable information concerning these phenomena can be obtained only by breeding experiments in water of constant concentration. With an increase of salt content the animals become smaller, the length of the narrow post-abdomen in comparison with the abdomen increases, the furca (tail fork) becomes shorter and is set with fewer hairs (Fig. 108). The appearance of males also varies with the habitat; in many places there are only females, in others both sexes. One copepod, Diaptomus salinus, is also rather resistant against fluctuations of salt concentration; this is rare in fresh water, but may be abundant in salt lakes such as Lake Aral. Insects and insect larvae are the most numerous among Metazoa. A number of genera and species of hydrophilid water beetles and their
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Keywords: ., bookcentury1900, bookcollectionbiodive, booksubjectanimalecology
