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THE “CROWDING EFFECT” IN TAPEWORM INFECTIONS 1

THE “CROWDING EFFECT” IN TAPEWORM INFECTIONS 1 J. Parasitol., 86(2), 2000 p. 206­208 American Society of Parasitologists 2000 Clark P. Read Department of Zoology, University of California, Los Angeles Several workers have observed that in a cestode infection the size of the worms is, roughly speaking, inversely proportional to the number of worms in the given infection. This has been called the ``crowding effect.'' Woodland (1924), Shorb (1933), and Hunninen (1935) demonstrated this phenomenon in rats and mice infected with Hymenolepis nana. Chandler (1939) and Hager (1941) reported this effect in studies on Hymenolepis diminuta. Reid (1942) obtained similar results with Raillietina cesticillus. Reid's data may be somewhat more accurate from a quantitative standpoint since he used weight as a measure of size, whereas previous workers relied on linear measurements as criteria. Wardle and Green (1941), studying the rate of growth of Diphyllobothrium latum, used the weight-length ratio as an index of average cross sectional area. This seems to be a valid approach to problems of this type. In connection with other studies on the metabolism of Hymenolepis diminuta the writer has gathered considerable data on the mean wet weights of worms from infections varying in size from one to one hundred worms. In selecting http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Parasitology Allen Press

THE “CROWDING EFFECT” IN TAPEWORM INFECTIONS 1

Read, Clark P.
Journal of Parasitology , Volume 86 (2) – Apr 1, 2000
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Publisher
Allen Press
Copyright
American Society of Parasitologists
ISSN
0022-3395
eISSN
1937-2345
DOI
10.1645/0022-3395%282000%29086%5B0206:TCEITI%5D2.0.CO%3B2
Publisher site
See Article on Publisher Site

Abstract

J. Parasitol., 86(2), 2000 p. 206­208 American Society of Parasitologists 2000 Clark P. Read Department of Zoology, University of California, Los Angeles Several workers have observed that in a cestode infection the size of the worms is, roughly speaking, inversely proportional to the number of worms in the given infection. This has been called the ``crowding effect.'' Woodland (1924), Shorb (1933), and Hunninen (1935) demonstrated this phenomenon in rats and mice infected with Hymenolepis nana. Chandler (1939) and Hager (1941) reported this effect in studies on Hymenolepis diminuta. Reid (1942) obtained similar results with Raillietina cesticillus. Reid's data may be somewhat more accurate from a quantitative standpoint since he used weight as a measure of size, whereas previous workers relied on linear measurements as criteria. Wardle and Green (1941), studying the rate of growth of Diphyllobothrium latum, used the weight-length ratio as an index of average cross sectional area. This seems to be a valid approach to problems of this type. In connection with other studies on the metabolism of Hymenolepis diminuta the writer has gathered considerable data on the mean wet weights of worms from infections varying in size from one to one hundred worms. In selecting

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Journal of Parasitology – Allen Press

Published: Apr 1, 2000

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