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JPR Advance Access published online on June 27, 2008
Journal of Plankton Research, doi:10.1093/plankt/fbn069
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© The Author 2008. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Diet quality impact on growth, reproduction, and digestive activity in Brachionus calyciflorus

Martina Strojsová1,2,*, Jirí Nedoma2, Jaromír Sed'a2,1 and Jaroslav Vrba1,2

1 University of South Bohemia, Faculty of Science, Branisovská 31, CZ-37005 Ceské Budejovice, Czech Republic 2 Biology Centre AS CR, Institute of Hydrobiology, Na Sádkách 7, CZ-37005 Ceské Budejovice, Czech Republic

* Corresponding author: martina.strojsova{at}seznam.cz

Received on March 13, 2008; revised on June 24, 2008; accepted on June 26, 2008


  Abstract

We examined population growth rate, reproduction, and phosphatase activity in digestive tracts of individual Brachionus calyciflorus fed by P-replete (molar C:P = 107) or P-depleted (C:P = 920) algal food supplied at three carbon (C) concentrations (1, 2, and 4 mg C L-1). Rotifer growth rate was significantly influenced by P content, whereas the effect of algal C concentration was not significant. Both algal P content and C concentration had a significant effect on the egg ratio. The individual amount of chlorophyll a (chl-a) was considered as a proxy for the ingested algal food occurring in the rotifer's gut and phosphatase activity in the gut likely reflected variable individual assimilation of P under different food treatments. Both the amount of chl-a and phosphatase activity in the rotifers fed by P-replete algae significantly increased with the increasing C concentration in the food suspension. In contrast, the amount of chl-a significantly decreased with increasing food concentration, and phosphatase activity did not change significantly over different food quantity in the rotifers fed by P-depleted algae. Thus the hypothesis that P-deficient rotifers use preabsorptive regulation by changing activity of the digestive enzymes is not supported by the data.

Key Words: phosphorus limitation • phosphatase • rotifer preabsorptive regulation in the gut • reproduction

Communicating Editor: Dr John Dolan


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