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Ecology of algal communities of different soil types from Cierva Point, Antarctic Peninsula

机译：南极切尔瓦角不同土壤类型的藻类群落生态

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摘要

During summer 2005/2006, we characterized three sampling sites on mineral soils and four on ornitho-genic soils from Cierva Point, Antarctic Peninsula, in terms of topographic and abiotic features (altitude, slope, magnetic direction, temperature, texture, pH, conductivity, organic matter, moisture and nutrient concentrations), and compared their microalgal communities through taxonomic composition, species richness, diversity, chlorophyll a content and their variation in time. Average values of pH, moisture, organic matter and nutrient concentrations were always significantly lower in mineral than in ornithogenic soils. Low N/P mass ratio showed potential N-limitation of biomass capacity in the former. On the other hand, the results suggested that physical stability is not as a key stress factor for mineral soil microalgae. Chlorophyll a concentration was not only higher in ornithogenic soils, but it also showed a wider range of values. As this parameter was positively correlated with temperature, pH, nutrients, organic matter and moisture, we cannot come to conclusions regarding the influence of each factor on algal growth. Communities of mineral soils were significantly more diverse than those of enriched ornithogenic soils due to higher species richness as well as higher equitability. Also, their structure was steadier over time, as shown by a cluster analysis based on relative frequency of algal taxa. Although Cyanobacteria and Bacillariophyceae dominated almost all samples, Chlorophyceae represented 34% of the 140 taxa recorded, and most of them observed only in cultures. The detection under controlled conditions of a high latent species richness in harsh mineral soil sites shows that the composition and equitability of these microalgal communities would be more prone to modification due to the manifold local consequences of climatic change than those of ornithogenic soils.
机译：在2005/2006年夏季，我们根据地形和非生物特征（海拔，坡度，磁方向，温度，质地，pH，电导率）对来自南极半岛Cierva Point的矿质土壤上的三个采样点和鸟类生土上的四个采样点进行了表征。 ，有机物，水分和营养物浓度），并通过分类学组成，物种丰富度，多样性，叶绿素a含量及其时间变化比较了它们的微藻群落。矿物质中的pH，水分，有机质和营养物浓度的平均值始终显着低于鸟类土壤。低N / P质量比显示前者潜在的N限制生物量。另一方面，结果表明，物理稳定性不是矿质土壤微藻类的关键胁迫因素。叶绿素a浓度不仅在鸟类生土中较高，而且还显示了更宽的范围。由于该参数与温度，pH，养分，有机质和水分呈正相关，因此我们无法得出有关每种因素对藻类生长的影响的结论。由于更高的物种丰富度和更高的公平性，矿物质土壤的群落比丰富的鸟类群落的多样性明显更多。而且，它们的结构随着时间的推移而变得更稳定，如基于藻类群相对频率的聚类分析所示。尽管蓝细菌和芽孢杆菌几乎控制了所有样品，但绿藻科占记录的140个类群的34％，其中大多数仅在培养物中观察到。在受控条件下在恶劣的矿物土壤站点中发现高潜在物种丰富度的结果表明，由于气候变化的多种局部后果，这些微藻群落的组成和公平性将比鸟类生长的土壤更容易被修改。

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  • 来源
    《Polar biology》 |2011年第3期|p.339-351|共13页
  • 作者

    G. Gonzalez Garraza; G. Mataloni; P. Fermani; A. Vinocur;

  • 作者单位

    Instituto de Investigation e Ingeniena Ambiental (3iA),Universidad National de Gral. San Martin,Buenos Aires, Argentina;

    Instituto de Investigation e Ingeniena Ambiental (3iA),Universidad National de Gral. San Martin,Buenos Aires, Argentina,Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET), Buenos Aires, Argentina;

    Laboratorio de Ecologia y Fotobiologia Acuatica,IIB-INTECH, Chascomus, Buenos Aires, Argentina;

    Depto. de Biodiversidad y Biologia Experimental,Depto. de Ecologia, Genetica y Evolution,Facultad de Cs. Exactas y Naturales,Universidad de Buenos Aires, Buenos Aires, Argentina;

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  • 正文语种 eng
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  • 关键词

    maritime antarctica; soil algae; community structure; ornithogenic soils; mineral soils;

    机译：海洋南极洲土壤藻类社区结构;鸟生土;矿物土壤;

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