Document Detail


The good, the bad and the plenty: interactive effects of food quality and quantity on the growth of different Daphnia species.
MedLine Citation:
PMID:  23049734     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Effects of food quality and quantity on consumers are neither independent nor interchangeable. Although consumer growth and reproduction show strong variation in relation to both food quality and quantity, the effects of food quality or food quantity have usually been studied in isolation. In two experiments, we studied the growth and reproduction in three filter-feeding freshwater zooplankton species, i.e. Daphnia galeata x hyalina, D. pulicaria and D. magna, on their algal food (Scenedesmus obliquus), varying in carbon to phosphorus (C∶P) ratios and quantities (concentrations). In the first experiment, we found a strong positive effect of the phosphorus content of food on growth of Daphnia, both in their early and late juvenile development. Variation in the relationship between the P-content of animals and their growth rate reflected interspecific differences in nutrient requirements. Although growth rates typically decreased as development neared maturation, this did not affect these species-specific couplings between growth rate and Daphnia P-content. In the second experiment, we examined the effects of food quality on Daphnia growth at different levels of food quantity. With the same decrease in P-content of food, species with higher estimated P-content at zero growth showed a larger increase in threshold food concentrations (i.e. food concentration sufficient to meet metabolic requirements but not growth). These results suggest that physiological processes such as maintenance and growth may in combination explain effects of food quality and quantity on consumers. Our study shows that differences in response to variation in food quality and quantity exist between species. As a consequence, species-specific effects of food quality on consumer growth will also determine how species deal with varying food levels, which has implications for resource-consumer interactions.
Authors:
Tibor Bukovinszky; Antonie M Verschoor; Nico R Helmsing; T Martijn Bezemer; Elisabeth S Bakker; Matthijs Vos; Lisette N de Senerpont Domis
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-09-25
Journal Detail:
Title:  PloS one     Volume:  7     ISSN:  1932-6203     ISO Abbreviation:  PLoS ONE     Publication Date:  2012  
Date Detail:
Created Date:  2012-10-10     Completed Date:  2013-04-22     Revised Date:  2013-07-11    
Medline Journal Info:
Nlm Unique ID:  101285081     Medline TA:  PLoS One     Country:  United States    
Other Details:
Languages:  eng     Pagination:  e42966     Citation Subset:  IM    
Affiliation:
Department of Aquatic Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, The Netherlands. tibor.bukovinszki@wur.nl
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MeSH Terms
Descriptor/Qualifier:
Age Factors
Animals
Carbon / metabolism*
Daphnia / classification,  physiology*
Female
Food*
Food Chain
Male
Phosphorus / metabolism*
Population Dynamics / trends
Reproduction*
Scenedesmus / chemistry*
Species Specificity
Zooplankton / chemistry*
Chemical
Reg. No./Substance:
7440-44-0/Carbon; 7723-14-0/Phosphorus
Comments/Corrections

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