Daphnia size structure,vertical migration,and phosphorus redistribution |
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| Authors: | M L Dini J O'Donnell S R Carpenter M M Elser J J Elser A M Bergquist |
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| Institution: | (1) Dept. of Biological Sciences, University of Notre Dame, 46556 Notre Dame, Indiana, U.S.A.;(2) Present address: 1023 Lorlyn Circle, Apt. 3A, 60510 Batavia, IL;(3) Present address: Environmental Sciences Department, Massachusetts Audubon Society, 10 Juniper Rd., 02178 Belmont, MA |
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| Abstract: | The timing and magnitude of diel migration in two daphnid assemblages were determined from a series of vertical profiles of daphnid size distribution. Animals were collected concurrently for gut fullness determination. Only large daphnids (> 1.4 mm) migrated, but these animals could account for substantial vertical and diel differences in phosphorus excretion rate. Gut fullness measurements and time courses of diel vertical migration suggested that large Daphnia can cause a net downward flux of phosphorus during summer in thermally stratified lakes. |
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| Keywords: | Daphnia diel cycle excretion migration phosphorus |
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