Upward phosphorus transport by Daphnia diel vertical migration

Title
Upward phosphorus transport by Daphnia diel vertical migration
Publication Type
Journal Article
Year of Publication
2010
Authors

Haupt F, Stockenreiter M, Reichwaldt ES, Baumgartner M, Lampert W, Boersma M, Stibor H

Journal
Limnology and Oceanography
Volume
55
Pagination
529-534
ISBN Number
0024-3590
Keywords

phytoplankton dynamics, Zooplankton, water, Nutrients, growth, carbon, model, lake, 7.3m3, freshwater, plankton towers, Plon, Germany

Abstract

In many lakes, zooplankton show a distinct diel vertical migration (DVM) behavior, especially during periods of stratification. Excretion products of these zooplankton could potentially cause an upward nutrient transport and consequent nutrient enrichment for phytoplankton in the epilimnion. We quantified the upward transport of phosphorus by the cladoceran Daphnia DVM experimentally by adding a radioactive tracer ((33)P) to the hypolimnion of large indoor mesocosms and measuring tracer accumulation in the epilimnion over time. During the daytime, when all Daphnia were found in the hypolimnion, no phosphorus transport from the hypolimnion into the epilimnion took place. As soon as the Daphnia started their upward migration, around dusk, we observed a continuous increase in phosphorus concentration in the epilimnion. The amount of phosphorus transported was in a biologically meaningful range. Our results strongly suggest that Daphnia vertical migration presents a continuous nutrient supply for the epilimnion.

Date of Published
Mar
Accession Number
WOS:000276440000006
Type of Article
Article
Alternate Journal
Limnol. Oceanogr.