Nature and source of suspended particulate matter and detritus along an austral temperate river–estuary continuum, assessed using stable isotope analysis

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• 作者：Tatenda Dalu ; Nicole B. Richoux ; P. William Froneman
• 关键词：Allochthonous ; Autochthonous ; Benthic algae ; Carbon ; Kowie ; Nitrogen ; SIAR ; Stable isotope ratios ; Anthropogenic
• 刊名：Hydrobiologia
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：767
• 期：1
• 页码：95-110
• 全文大小：863 KB
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• 作者单位：Tatenda Dalu (1)
  Nicole B. Richoux (1)
  P. William Froneman (1)
  
  1. Department of Zoology and Entomology, Rhodes University, P O Box 94, Grahamstown, 6140, South Africa
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Hydrobiology
  Ecology
  
• 出版者：Springer Netherlands
• ISSN：1573-5117

文摘

Ecologists are interested in the factors that control, and the variability in, the contributions of different sources to mixed organic materials travelling through lotic systems. We hypothesized that the source matter fuelling mixed organic pools in a river–estuary continuum varies over space and time. Samples of the mixed organic pools were collected along a small temperate river (Kowie River) in southern Africa during early and late spring, summer and winter. The C:N ratios of suspended particulate matter (SPM) collected during summer and winter indicated that the lower reaches of the system had similar organic matter contributions. Stable isotope analysis in R revealed that aquatic macrophytes were significant contributors to SPM in the upper reaches. Bulk detritus had large allochthonous matter components in the lower reaches, and contributions of aquatic macrophytes and benthic algae were high (>50%) in the upper to middle reaches. The evaluation of organic matter contributions to SPM and detritus along the river–estuary continuum provided a baseline assessment of the nature and sources of potential food for consumers inhabiting different locations during different seasons. Incorporating SPM and detritus spatio-temporal variations in food web studies will improve our understanding of carbon flow in aquatic systems. Keywords Allochthonous Autochthonous Benthic algae Carbon Kowie Nitrogen SIAR Stable isotope ratios Anthropogenic