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|關鍵字:||食物網;Food web;穩定碳、氮同位素;七家灣溪;台灣櫻花鉤吻鮭;Stable carbon and nitrogen isotopes;Chichiawan Stream;Formosan salmon||出版社:||臺中巿： 國立中興大學農學院||Project:||農林學報, Volume 60, Issue 2, Page(s) 93-107.||摘要:||
This study examined the food web of Chichiawan Stream (central Taiwan) and evaluated the trophic sources of Formosan landlocked salmon through analysis of stable carbon and nitrogen isotope compositions of dominant species. The species sampled in both rainy and dry seasons include 132 samples of aquatic insects, periphytons, riparian vegetations, fine particular organic matter, and the Formosan salmon. The characteristic values of δ^13C and δ^15N indicate that C3 riparian vegetation is the primary trophic source of the stream. Because the extent of soil leaching owing to precipitation is higher in rainy season than that in dry season, the δ^15N values of periphytons are more depleted in rainy season relative to dry season. In addition, the feature that δ^15N value of fine particular organic matter is heavier in rainy than in dry season is due to a more significant isotopic fractionation on rainy-season sample. The isotope fractionation resulting from microbiological decomposition is significant in rainy season because the trophic condition in rainy season is inferior to that of dry season. The food-source evaluation for every trophic level performed by IsoSource package indicates that a trophic relation regarding to Formosan salmon in rainy season is established and the trophic level of bio-species from lower to higher are C3 riparian vegetation, filter aquatic insect, predator aquatic insect, and Formosan salmon in order. However, the IsoSource cannot obtain the information of major food source for Formosan salmon in dry season. This unavailable result may be that some food sources had not been found and involved in IsoSource.
|Appears in Collections:||農業暨自然資源學院|
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