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Effect of canopy removal on a rocky shore community metabolism and structure

机译：冠层去除对岩岸群落代谢和结构的影响

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摘要

The effects of the permanent removal of the canopy-forming alga Fucus serratus was studied in terms of both functioning and diversity on a mid-low rocky shore ecosystem in the south-west English Channel (48°N 43.686', 3°W 59.282'). Ecosystem functioning was examined as net or gross primary productivity (NPP or GPP) and respiration (Resp) measured through CO_2 fluxes. Diversity was examined as number and composition of species. Measurements were performed in situ, during emersion times, without altering target assemblages. The experiment was designed with two treatments [control (C) or canopy removed (CR)] and five replicates, and was conducted over an 18-month period (from February 2006 to August 2007) to integrate the seasonal variability. The mean GPP and Resp were severely reduced in CR treatment compared to control throughout the survey. The mean NPP was not affected at first, due to the development of opportunistic green algae, but was drastically reduced after 9 months of experiment. The canopy removal affected neither the number of species nor their distribution among trophic groups, and the algal community was only slightly affected. The abundance and biomass of mobile invertebrates, however, were greatly reduced in the absence of canopy. This indicates an important effect of the dominant alga on the higher trophic levels of the community. At this tidal level, the canopy did not seem to affect the community by dampening the environmental stress but by providing food, habitat or both.
机译：从功能和多样性的角度研究了西南英吉利海峡中低岩石海岸生态系统（48°N 43.686'，3°W 59.282'）上永久去除冠层藻类海藻（Fusus serratus）的作用。 ）。通过CO_2通量测量生态系统功能，以净或总初级生产力（NPP或GPP）和呼吸（Resp）的形式进行检查。多样性作为物种的数量和组成进行了研究。在出没期间，在不改变目标组件的情况下进行了原位测量。该实验设计了两种处理方式（对照（C）或去除冠层（CR））和五次重复，并在18个月内（从2006年2月至2007年8月）进行以整合季节性变化。在整个调查中，与对照组相比，CR治疗的平均GPP和Resp均大大降低。由于机会绿藻的发展，平均NPP最初并未受到影响，但经过9个月的实验后，NPP急剧降低。去除冠层既不影响物种的数量，也不影响其在营养族之间的分布，藻类群落仅受到轻微影响。然而，在没有树冠的情况下，活动无脊椎动物的丰度和生物量大大降低。这表明优势藻对社区较高营养水平的重要影响。在这个潮汐水平上，冠层似乎并没有通过减轻环境压力而是通过提供食物，栖息地或两者来影响社区。

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  • 来源
    《Marine biology》 |2015年第2期|449-457|共9页
  • 作者

    Aline Migne; Claire Gollety; Dominique Davoult;

  • 作者单位

    UPMC Univ Paris 06, Sorbonne Universites, Station Biologique de Roscoff, 29680 Roscoff, France,UMR 7144, CNRS, Station Biologique de Roscoff, 29680 Roscoff, France;

    UPMC Univ Paris 06, Sorbonne Universites, Station Biologique de Roscoff, 29680 Roscoff, France,UMR 7144, CNRS, Station Biologique de Roscoff, 29680 Roscoff, France,CUFR de Mayotte, Route Nationale 3, BP 53,97660 Dembeni, France;

    UPMC Univ Paris 06, Sorbonne Universites, Station Biologique de Roscoff, 29680 Roscoff, France,UMR 7144, CNRS, Station Biologique de Roscoff, 29680 Roscoff, France;

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