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作者 Radomske, Erinn Honor
書名 Dependencies of food web and nutrient cycling dynamics on dissolved organic matter (DOM) and inorganic nutrient concentrations in lake enclosures
國際標準書號 9780494046579
book jacket
說明 134 p
附註 Source: Masters Abstracts International, Volume: 44-01, page: 0254
Thesis (M.Sc.)--University of Northern British Columbia (Canada), 2005
An autotrophic-allotrophic gradient was established in 12 lake enclosures across a natural DOM concentration gradient. Phytoplankton were co-regulated by solar irradiance and inorganic nutrient concentrations, whereas bacterioplankton were strongly dependent on DOM in the reference enclosures. Nutrient scavenging in the reference enclosures was limited by efficient biotic incorporation and recycling, across the full DOM gradient. Nutrient enrichment stimulated a strong autotrophic response across the autotrophic-allotrophic gradient due to increased phytoplankton productivity. Bacterioplankton productivity was still strongly dependent on DOM, but bacterioplankton productivity also increased either as a direct or indirect result of nutrient enrichment. Carbon, nitrogen, and phosphorus were effectively scavenged from the water column by incorporation into biomass at high rates and then deposited in the sediments in the nutrient enriched enclosures, producing nutrient-rich sediments. The data further suggest that at DOM concentrations greater than 14 mg L -1, allotrophy would dominate regardless of inorganic nutrient enrichment
School code: 1387
DDC
Host Item Masters Abstracts International 44-01
主題 Biology, Limnology
Biology, Plant Physiology
Biology, Ecology
Agriculture, Fisheries and Aquaculture
0793
0817
0329
0792
Alt Author University of Northern British Columbia (Canada)
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