. Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage. Zoogeography -- Geographical distribution; Animal ecology. 350 ANIMALS IN INLAND WATERS much-diminished length of the anterior bristle, and the pond form of Anuraea cochlearis72 differs from the lake form by having a brownish yellow color and a shorter posterior bristle. Daphnias are considerably larger in the smaller waters than their relatives in the The size of Diaptomus laciniatus,74 on the other hand, increases with the size of the body of water in which it lives;
. Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage. Zoogeography -- Geographical distribution; Animal ecology. 350 ANIMALS IN INLAND WATERS much-diminished length of the anterior bristle, and the pond form of Anuraea cochlearis72 differs from the lake form by having a brownish yellow color and a shorter posterior bristle. Daphnias are considerably larger in the smaller waters than their relatives in the The size of Diaptomus laciniatus,74 on the other hand, increases with the size of the body of water in which it lives; it remains very small in small mountain lakes in spite of a plentiful food supply, but reaches its maximum length in larger lakes of the plains which have a pro- nounced, though less rich, plankton area. The pond form of the gnat larva, Corethra plumicornis,'15 can also be distinguished from a lake form (Fig. 102); the pond form is plumper, larger (15:11 mm.), of dull coloration in contrast with the very transparent lake form, and. Fig. 102.—a, Larva of Corethra plumicornis, with its tracheal air sacks in black; b, head of pond form; c, of lake form; d, anal fan of pond form, e, of lake form, a, after von Frankenberg; b-e, after Wesenberg-Lund. has a larger head with a short proboscis, larger eyes, plumper tracheal bladders, and a larger tail fan. The fact that among the daphnias of pools the males appear more often, and fertilized eggs are more frequently formed, than among lake daphnias, depends upon the greater variations of temperature in the smaller water basins or upon phenomena associated with crowd- ing70 or both. The animal communities of bodies of water which are not perma- nent—the ephemeral water basins—show marked uniformity in spite of the great variation in size and contour. These ephemeral waters usually exist periodically and disappear at more or less definite times; they are less often of entirely accidental nature. From the rain pud- dles and clay pits
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