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Using biochemical and isotopic tracers to characterise organic matter sources and their incorporation into estuarine food webs (Rufiji delta, Tanzania)
Dar es Salaam University, Tanzania.
Linköping University, Department of Thematic Studies, Tema Environmental Change. Linköping University, Faculty of Arts and Sciences.
2017 (English)In: Chemistry in ecology, ISSN 0275-7540, E-ISSN 1029-0370, Vol. 33, no 10, p. 893-917Article in journal (Refereed) Published
Abstract [en]

Fatty acid biomarkers and stable isotope signatures were used to identify the sources of particulate and sedimentary organic matter and its input into the food web through the dominant consumer within the mangrove-dominated Rufiji estuary, Tanzania. Specific fatty acids were used to identify the preferred basal sources of dominant fauna (i.e. filter feeder bivalves, snails, crabs, shrimps, and three fish species), and their presence in the water and sediment samples in the estuary. Both fatty acid and stable isotope results revealed that food web in the Rufiji estuary depended on a variety of carbon sources (mangroves, allochthonous terrestrial inputs, macroalgae, and phytoplankton), contributing to a different degree into the diets of primary consumers and members of near-shore fish, but none of them were obligatory for the survival of these species. The delta N-15 values of major primary producers and consumers/predators revealed a trend for delta N-15 enrichment with increasing trophic level. The ratio of docosahexaenoic acid to eicosapentaenoic acid (DHA:EPA) decreased from pelagic to benthic feeding fish. This indicated that fish with different feeding modes derived their fatty acids from different primary sources of nutrition, and suggested that the DHA: EPA ratio may be a useful indicator of feeding mode.

Place, publisher, year, edition, pages
TAYLOR & FRANCIS LTD , 2017. Vol. 33, no 10, p. 893-917
Keyword [en]
Fatty acid; stable isotopes; organic matter; food web; Rufiji estuary
National Category
Ecology
Identifiers
URN: urn:nbn:se:liu:diva-143381DOI: 10.1080/02757540.2017.1391796ISI: 000415759700001OAI: oai:DiVA.org:liu-143381DiVA: diva2:1162722
Note

Funding Agencies|Swedish Institute (SI) [00374/2014]

Available from: 2017-12-05 Created: 2017-12-05 Last updated: 2018-01-04

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The full text will be freely available from 2018-10-21 09:55
Available from 2018-10-21 09:55

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
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  • Other style
More styles
Language
  • de-DE
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  • nn-NB
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More languages
Output format
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  • asciidoc
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