Gonadal neoplasms in wild carp-goldfish hybrids from the Welland River near Niagara Falls,Canada |
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Authors: | M D Dickman P O Steele |
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Institution: | (1) Institute of Ecology, University of Georgia, Athens, GA, 30602;(2) Present address: Institute of Ecosystem Studies, New York Botanical Garden, The Mary Flagler Cary Arboretum, Box AB, Millbrook, NY 12545, USA |
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Abstract: | An experimental approach was taken to examine the processes of detritus decomposition in river sediments.Addition of macrophyte detritus (Alternanthera philoxeroides (Mart.) Griseb) to river sediment resultedin an increase in carbon mineralization from a sbasal rate of 200 up to 500 mg C m–2 d–1.Carbon mineralization after addition of oak detritus was only slightly higher than mineralization in sediments thatreceived no addition ( 200 mg C m–2 d–1). Bacterial biomass and production in sediments \s+ alligator-weedwere higher than in sediments + oak or zero-addition. In these experiments the major fate of addedalligatorweed was mineralization. For alligatorweed detritus, microbial metabolism depletes organic carbonrather than leading to increases in food quality. Therefore, a pulse input of alligatorweed detritus would notbe available as a long-term source of organic carbon. Oak detritus was not rapidly decomposed, and sopersists in these sediments for a longer period. |
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Keywords: | Detritus sediments oxygen uptake bacteria |
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