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学科主题: Marine & Freshwater Biology; Oceanography
题名: Experimental test of the effect of ultraviolet-B radiation in a planktonic community
作者: Mostajir, B ; Demers, S ; de Mora, S ; Belzile, C ; Chanut, JP ; Gosselin, M ; Roy, S ; Villegas, PZ ; Fauchot, J ; Bouchard, J ; Bird, D ; Monfort, P ; Levasseur, M
刊名: LIMNOLOGY AND OCEANOGRAPHY
发表日期: 1999-01-01
卷: 44, 期:3, 页:586-596
部门归属: Inst Natl Rech Sci Oceanol, Grp Rech Environm Cotier, Rimouski, PQ G5L 3A1, Canada; Univ Quebec, Rimouski, PQ G5L 3A1, Canada; Univ Quebec, Dept Sci Biol, Montreal, PQ H3C 3P8, Canada; Univ Montpellier 2, Lab Hydrobiol Marine & Continentale, CNRS, Unite Mixte Rech Ecosyst Iagunaires,UMR 5556, F-34095 Montpellier 5, France; Minist Peches & Oceans, Inst Maurice Lamontagne, Mt Joli, PQ G5H 3Z4, Canada
英文摘要: Ultraviolet-B (UVB, 280-320 nm) radiation is a natural component of sunlight that harms organisms and disturbs natural communities in surface waters. A natural planktonic assemblage of organisms (<240 mu m) was studied in a mesocosm experiment for 7 d under varying conditions of UVB radiation: UVB excluded, natural radiation, and UVB enhanced at two different levels. The dynamics of several populations at different trophic levels comprising heterotrophic bacteria (<1 mu m), heterotrophic flagellates (2-10 mu m), small phytoplankton (<5 mu m), large phyto plankton (5-20 mu m), and ciliates (15-35 mu m) were monitored during the experiment. Enhanced UVB provoked a significant decrease in the number of ciliates (66%) and large phytoplankton (63%) relative to natural WE conditions. The severe effects of UVB radiation on ciliates and large phytoplankton communities shown here would strongly limit upward transfer of mass and energy. The decline of predator abundance (ciliates) under UVB stress relative to natural conditions resulted in a positive feedback between enhanced UVB radiation and prey abundances, shown by increased abundances of bacteria (49%), heterotrophic flagellates (up to 300%), and small phytoplankton (41%). Similarly, with respect to carbon partitioning, the decrease in ciliate and diatom carbon biomass (64 and 56%, respectively) under enhanced WE exposure was balanced by an increase in the carbon biomass of heterotrophic bacteria (48%), heterotrophic flagellates (126%), and autotrophic flagellates (162%). As a manifestation of enhanced UVB at the community level, the ecosystem develops toward a microbial food web in preference to an herbivorous food web. Thus, enhanced UVB radiation can change the structure and dynamics of the pelagic food web.
语种: 英语
原文出处: 查看原文
内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/9352
Appears in Collections:海洋微食物网高被引文献_期刊论文

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Mostajir, B; Demers, S; de Mora, S; Belzile, C; Chanut, JP; Gosselin, M; Roy, S; Villegas, PZ; Fauchot, J; Bouchard, J; Bird, D; Monfort, P; Levasseur, M.Experimental test of the effect of ultraviolet-B radiation in a planktonic community,LIMNOLOGY AND OCEANOGRAPHY,1999,44(3):586-596
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