Document Detail


Carbon source accounting for fish using combined DNA and stable isotope analyses in a regulated lowland river weir pool.
MedLine Citation:
PMID:  19912537     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Determining the source and flow of carbon, energy and nutrients through food webs is essential for understanding ecological connectivity and thus determining the impact of management practices on biodiversity. We combined DNA sequencing, microarrays and stable isotope analyses to test whether this approach would allow us to resolve the carbon flows through food webs in a weir pool on the lower Murray River, a highly impacted, complex and regulated ecosystem in southern Australia. We demonstrate that small fish in the Murray River consume a wide range of food items, but that a significant component of carbon and nitrogen entering the food web during dry periods in summer, but not spring, is derived from nonconventional sources other than in-channel primary producers. This study also showed that isotopic analyses alone cannot distinguish food sources and that a combined approach is better able to elucidate food-consumer dynamics. Our results highlight that a major river ecosystem, stressed by reduced environmental flows, can rapidly undergo significant and previously undetected changes that impact on the ecology of the system as a whole.
Authors:
Christopher M Hardy; Evelyn S Krull; Diana M Hartley; Roderick L Oliver
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Publication Detail:
Type:  Journal Article     Date:  2009-11-11
Journal Detail:
Title:  Molecular ecology     Volume:  19     ISSN:  1365-294X     ISO Abbreviation:  Mol. Ecol.     Publication Date:  2010 Jan 
Date Detail:
Created Date:  2010-01-18     Completed Date:  2010-02-01     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9214478     Medline TA:  Mol Ecol     Country:  England    
Other Details:
Languages:  eng     Pagination:  197-212     Citation Subset:  IM    
Affiliation:
CSIRO Water for a Healthy Country National Research Flagship, GPO Box 1700, Canberra, ACT 2601, Australia. chris.hardy@csiro.au
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MeSH Terms
Descriptor/Qualifier:
Animals
Carbon Isotopes / analysis*
DNA / analysis*
Ecology / methods
Fishes / physiology*
Food Chain*
Nitrogen Isotopes / analysis*
Oligonucleotide Array Sequence Analysis
Rivers
Seasons
South Australia
Chemical
Reg. No./Substance:
0/Carbon Isotopes; 0/Nitrogen Isotopes; 9007-49-2/DNA

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


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