Document Detail

Dietary essential amino acids affect the reproduction of the keystone herbivore Daphnia pulex.
MedLine Citation:
PMID:  22163027     Owner:  NLM     Status:  MEDLINE    
Recent studies have indicated that nitrogen availability can be an important determinant of primary production in freshwater lakes and that herbivore growth can be limited by low dietary nitrogen availability. Furthermore, a lack of specific essential nitrogenous biochemicals (such as essential amino acids) might be another important constraint on the fitness of consumers. This might be of particular importance for cladoceran zooplankton, which can switch between two alternative reproductive strategies--the production of subitaneously developing and resting eggs. Here, we hypothesize that both the somatic growth and the type of reproduction of the aquatic keystone herbivore Daphnia is limited by the availability of specific essential amino acids in the diet. In laboratory experiments, we investigated this hypothesis by feeding a high quality phytoplankton organism (Cryptomonas) and a green alga of moderate nutritional quality (Chlamydomonas) to a clone of Daphnia pulex with and without the addition of essential amino acids. The somatic growth of D. pulex differed between the algae of different nutritional quality, but not dependent on the addition of dissolved amino acids. However, in reproduction experiments, where moderate crowding conditions at saturating food quantities were applied, addition of the essential amino acids arginine and histidine (but not lysine and threonine) increased the total number and the developmental stage of subitaneous eggs. While D. pulex did not produce resting eggs on Cryptomonas, relatively high numbers of resting eggs were released on Chlamydomonas. When arginine and histidine were added to the green algal diet, the production of resting eggs was effectively suppressed. This demonstrates the high, but previously overlooked importance of single essential amino acids for the reproductive strategy of the aquatic keystone herbivore Daphnia.
Patrick Fink; Claudia Pflitsch; Kay Marin
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2011-12-05
Journal Detail:
Title:  PloS one     Volume:  6     ISSN:  1932-6203     ISO Abbreviation:  PLoS ONE     Publication Date:  2011  
Date Detail:
Created Date:  2011-12-14     Completed Date:  2012-07-20     Revised Date:  2013-06-27    
Medline Journal Info:
Nlm Unique ID:  101285081     Medline TA:  PLoS One     Country:  United States    
Other Details:
Languages:  eng     Pagination:  e28498     Citation Subset:  IM    
Cologne Biocenter, Department of Aquatic Chemical Ecology, University of Cologne, Cologne, Germany.
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MeSH Terms
Amino Acids / metabolism
Amino Acids, Essential / metabolism*
Chlamydomonas / genetics,  metabolism
Cryptophyta / genetics
Daphnia / metabolism,  physiology*
Food Chain
Fresh Water
Models, Biological
Nitrogen / metabolism
Population Dynamics
Zooplankton / metabolism
Reg. No./Substance:
0/Amino Acids; 0/Amino Acids, Essential; 7727-37-9/Nitrogen
Erratum In:
PLoS One. 2012;7(6): doi/10.1371/annotation/6d71b282-8e08-43ba-bef7-7ad45cd48784

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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