Ecological animal geography; an authorized, Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage ecologicalanimal00hess Year: 1937 298 ANIMALS IN INLAND WATERS rotifers and of a few cladocerans are found; the property of adhesion to the surface of the water, which these small bodies possess, gives them the advantage of being driven by the wind into the littoral region where they find a higher temperature which promotes The glochidian larvae of the lake and river mussels (Anodonta, Unio) and the lake-floor larvae of th
Ecological animal geography; an authorized, Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage ecologicalanimal00hess Year: 1937 298 ANIMALS IN INLAND WATERS rotifers and of a few cladocerans are found; the property of adhesion to the surface of the water, which these small bodies possess, gives them the advantage of being driven by the wind into the littoral region where they find a higher temperature which promotes The glochidian larvae of the lake and river mussels (Anodonta, Unio) and the lake-floor larvae of the midge (Tendipedidae) are occasionally Fig. 79 Fig. 80 Fig. 79.—Holopedium gibberum. X 14. After Fric and Vavra. Fig. 80.—Mastigocerca setifera in its gelatinous case. X 130. After Lauterborn. mixed with the plankton by means of the wave action of shallow waters. The character of the fresh-water plankton is further considerably influenced by the fact that the size of its animals is much less than in the ocean. Such large forms as siphonophores, ctenophores, heteropods, pteropods, and arrowworms are not known in fresh waters. The forms just mentioned are mostly jelly-like; their bodies contain an extraor- dinary amount of water, which considerably increases their size. The absorption of large amounts of fresh water into the body of an animal
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