Document Detail

Effects of stoichiometric dietary mixing on Daphnia growth and reproduction.
MedLine Citation:
PMID:  14716554     Owner:  NLM     Status:  MEDLINE    
Herbivores often encounter nutritional deficiencies in their diets because of low nutrient content of plant biomass. Consumption of various diet items with different nutrient contents can potentially alleviate these nutritional deficiencies. However, most laboratory studies and modeling of herbivorous animals have been done with diets in which all food has uniform nutrient content. It is not clear whether heterogeneous versus uniform food of equal overall nutrient content is of equivalent nutritional value. We tested the effects of dietary mixing on performance of a model organism, Daphnia. We fed two species of Daphnia ( D. galeata, D. pulicaria) with diets of equivalent bulk stoichiometric food quality (C:P) and studied whether they would produce equivalent performance when C:P was uniform among cells or when the diet involved a mixture of high C:P and low C:P cells. Daphnia were fed saturating and limiting concentrations of a uniform food of moderate C:P (UNI) or mixtures (MIX) of high C:P (LOP) and low C:P (HIP) algae prepared to match C:P in UNI. Daphnia were also fed HIP and LOP algae separately. Juvenile growth rate and adult fecundity were measured. D. galeata performance in UNI and MIX treatments did not differ, indicating that partitioning of C and P among particles did not affect dietary quality. Similarly, D. pulicaria's performance was similar in the MIX and UNI treatments but only at low food abundance. In the high food treatment, both growth and reproduction were higher in the MIX treatment, indicating some benefit of a more heterogeneous diet. The mechanisms for this improvement are unclear. Also, food quality affected growth and reproduction even at low food levels for both D. pulicaria and D. galeata. Our results indicate that some species of zooplankton can benefit from stoichiometric heterogeneity on diet.
Kumud Acharya; Marcia Kyle; James J Elser
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2004-01-10
Journal Detail:
Title:  Oecologia     Volume:  138     ISSN:  0029-8549     ISO Abbreviation:  Oecologia     Publication Date:  2004 Feb 
Date Detail:
Created Date:  2004-01-27     Completed Date:  2004-05-27     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0150372     Medline TA:  Oecologia     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  333-40     Citation Subset:  IM    
School of Life Sciences, Arizona State University, Tempe, AZ 85287-4501, USA.
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MeSH Terms
Algae, Green / chemistry
Carbon / metabolism
Daphnia / growth & development*,  physiology*
Phosphorus / metabolism
Plants, Edible / chemistry
Population Dynamics
Reg. No./Substance:
7440-44-0/Carbon; 7723-14-0/Phosphorus

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