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首页> 外文期刊>Limnology >Primary production of phytoplankton and periphyton in two humic lakes of a South American wetland
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Primary production of phytoplankton and periphyton in two humic lakes of a South American wetland

机译：南美湿地两个腐殖质湖中浮游植物和浮游植物的初级生产

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摘要

Seasonal primary productivities of periphyton and phytoplankton were compared in Grande Lake (GL) and a relict oxbow lake (ROL) in winter 2006 and summer 2007. GL was free of floating plants on the sampling dates and covered over 80 and 100% of the ROL surface in winter and summer, respectively. The 14C assimilation technique was used to obtain the P–E curves of phytoplankton and periphyton on artificial substrata. The periphytic maximum photosynthetic rate (P max) was higher in the ROL in winter and summer, being better adapted to low irradiances than those in the GL. Phytoplankton and periphytic algae were light-limited in the ROL in summer due to complete coverage by floating macrophytes. In summer, P max and α values for periphyton in the ROL were higher than those for phytoplankton, and were even higher than in GL. In turn, P max and α values for phytoplankton in Grande Lake were higher than those for periphyton due to improved light conditions and the presence of algae that were adapted to movement through the water column. These results suggest that the complete coverage by floating macrophytes restricted phytoplankton productivity and allowed the development of a periphytic community that was better adapted to low-light conditions.
机译：在2006年冬季和2007年夏季，对格兰德湖（GL）和遗物牛弓湖（ROL）进行了周生植物和浮游植物的季节性初级生产力比较。GL在采样日期没有漂浮植物，覆盖了80％和100％的ROL分别在冬季和夏季。使用14 C同化技术获得了人工基质上浮游植物和附生植物的P–E曲线。在冬季和夏季，ROL中的植物周围最大光合速率（P max ）较高，比GL中的低辐照度更好。夏季，由于漂浮的大型植物完全覆盖了浮游植物和附生藻类，因此在ROL中对它们进行了光限制。夏季，ROL中浮游植物的P max和α值高于浮游植物，甚至高于GL。反过来，格兰德湖浮游植物的P max和α值比周围植物高，这是因为光照条件得到了改善，藻类的存在适合于通过水柱移动。这些结果表明，漂浮的大型植物的完全覆盖限制了浮游植物的生产力，并允许开发出一个更适合弱光条件的周生植物群落。

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  • 来源
    《Limnology》 |2012年第3期|p.281-287|共7页
  • 作者

    Patricia Rodríguez; M. Solange Vera; Haydée Pizarro;

  • 作者单位

    Laboratorio de Limnología, Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, C1428EHA, Ciudad de Buenos Aires, Argentina;

    Laboratorio de Limnología, Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, C1428EHA, Ciudad de Buenos Aires, Argentina;

    Laboratorio de Limnología, Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, C1428EHA, Ciudad de Buenos Aires, Argentina;

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  • 正文语种 eng
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  • 关键词

    Periphytic algae; Phytoplankton; Primary production; Humic shallow lakes; Floodplain wetland;

    机译：附生藻类;浮游植物;初级生产力;腐殖质浅湖;洪泛区湿地;

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