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• W2040223558 endingPage "769" @default.
• W2040223558 startingPage "759" @default.
• W2040223558 abstract "Abstract We review the use of stable carbon isotope ratios (δ 13 C) and radiocarbon natural abundances (Δ 14 C) for stream food web studies. The δ 13 C value of primary producers (e.g., periphytic algae, hereafter periphyton) in streams is controlled by isotopic fractionation during photosynthesis and variable δ 13 C of dissolved CO 2 . When periphyton δ 13 C differs from that of terrestrial primary producers, the relative contribution of autochthony and allochthony to stream food webs can be calculated. Moreover, the variation in periphyton δ 13 C can reveal how much stream consumers rely on local resources because each stream habitat (e.g., riffle vs. pool, open vs. shaded) usually has a distinctive δ 13 C. However, periphyton δ 13 C often overlaps with that of terrestrial organic matter. On the other hand, periphyton Δ 14 C is less variable than δ 13 C among habitats, and reflects the Δ 14 C of dissolved CO 2 , which could be a mixture of “aged” (Δ 14 C < 0 ‰) and “modern” (Δ 14 C > 0 ‰) carbon. This is because the Δ 14 C is corrected by its δ 13 C value for the isotopic fractionation during photosynthesis. Recent studies and our data indicate that many stream food webs are supported by “aged” carbon derived from the watershed via autochthonous production. The combined use of δ 13 C and Δ 14 C allows robust estimation of the carbon transfer pathway in a stream food web at multiple spatial scales ranging from the stream habitat level (e.g., riffle and pool) to watershed level (autochthony and allochthony). Furthermore, the Δ 14 C of stream food webs will expand our understanding about the time frame of carbon cycles in the watersheds." @default.
• W2040223558 created "2016-06-24" @default.
• W2040223558 creator A5015928349 @default.
• W2040223558 creator A5048754568 @default.
• W2040223558 creator A5050244105 @default.
• W2040223558 date "2013-01-05" @default.
• W2040223558 modified "2023-10-01" @default.
• W2040223558 title "Use of carbon-13 and carbon-14 natural abundances for stream food web studies" @default.
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• W2040223558 doi "https://doi.org/10.1007/s11284-012-1003-z" @default.
• W2040223558 hasPublicationYear "2013" @default.
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