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首页> 外文期刊>Plant Ecology >Mantel and partial Mantel tests suggest some factors that may control the local distribution of Aster laurentianus at Iles de la Madeleine, Quebec
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Mantel and partial Mantel tests suggest some factors that may control the local distribution of Aster laurentianus at Iles de la Madeleine, Quebec

机译：壁炉架和部分壁炉架测试表明，某些因素可能会控制魁北克Iles de la Madeleine的劳氏紫ster的局部分布

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摘要

Spatial heterogeneity is a significant aspect of ecosystem structure and function. Because ecological variables often are spatially autocorrelated, standard statistics frequently are not appropriate to analyze ecological data. In this paper, we use Mantel and partial Mantel tests to explore the spatial structure of and relationships between several variables - micro-topography, substrate salinity, wrack cover and the density of Aster laurentianus -at two sites at the periphery of a shallow lagoon at Iles de la Madeleine, Quebec. A. laurentianus is an annual halophyte endemic to the Gulf of St. Lawrence. It typically occurs in a narrow band (from ca. 50 to 200 cm wide) at the periphery of shallow lagoons. In this habitat, plants are exposed to frequent deposition of plant debris (wrack) and to the limiting effects of substrate salinity. Our analyses show that substrate salinity, wrack cover and density of A. laurentianus are significantly correlated with topography, and that wrack cover affects substrate salinity at both sites. At the first site, the abundance of A. laurentianus increases progressively with distance from the waterline, while at the second site, density increases initially, but then diminishes with distance from the waterline. At the first site, the most important structuring variable is wrack deposition, the effect of salinity on plant density being indirect. At the second site, which is somewhat sheltered, wrack deposition is far less important and substrate salinity predominates over wrack deposition as structuring variable. We suggest that A. laurentianus distribution along the shores of shallow lagoons is limited both by substrate salinity and wrack deposition, but that the relative importance of these structuring variables changes with the physical characteristics of the site.
机译：空间异质性是生态系统结构和功能的重要方面。由于生态变量通常在空间上是自相关的，因此标准统计经常不适合分析生态数据。在本文中，我们使用Mantel和部分Mantel测试来探索位于浅泻湖外围两个位置的微观地形，基质盐度、,盖和紫ster虫密度的几个变量的空间结构及其之间的关系。魁北克Iles de la Madeleine。劳伦斯不动杆菌是圣劳伦斯湾特有的一年生盐生植物。它通常发生在浅泻湖外围的窄带（约50至200 cm宽）中。在该生境中，植物经常遭受植物残渣（残骸）的沉积，并受到基质盐分的限制。我们的分析表明，底物盐度，月桂叶盲肠覆盖度和密度与地形显着相关，并且两部分的底物覆盖度都会影响底物盐度。在第一个部位，劳伦丁氏菌的丰度随着与水线距离的增加而逐渐增加，而在第二个部位，密度最初增加，但随与水线距离的增加而减小。在第一个位置，最重要的结构变量是残骸沉积，盐度对植物密度的影响是间接的。在第二个稍有遮挡的位置，残骸沉积远不那么重要，并且作为构造变量，底物盐度比残骸沉积占优势。我们认为，沿浅泻湖海岸的劳伦丁藻分布受基质盐分和残骸沉积的限制，但是这些结构变量的相对重要性随场地的物理特征而变化。

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