Niche Structure, Resource Partitioning, and Species Interactions of Mire Bryophytes Relative to Climatic and Ecological Gradients in Western Canada
Niche Structure, Resource Partitioning, and Species Interactions of Mire Bryophytes Relative to Climatic and Ecological Gradients in Western Canada
复制标题
DOI：
10.2307/3243564
复制
发表时间：
1992-01
期刊：
影响因子：
--
通讯作者：
L. Gignac
中科院分区：
文献类型：
--
作者：
L. Gignac
从不列颠哥伦比亚省至阿尔伯塔中部的夏洛特女王群岛，对27个泥炭地的沼泽植被进行了分析。研究的生境范围从超海洋沼泽和贫穷的沼泽到次大陆中等丰富的沼泽。生境生态位尺寸计算11泥炭藓和6个非泥炭藓物种alongfive气候梯度和生态变量，如地表水化学，相对于地下水位的高度，和上层覆盖。物种生态位重叠计算沿沿着Jive梯度：干燥度指数，校正的电导率和pH值的沼泽表面沃茨，高度，和上层覆盖。泥炭藓物种的栖息地分区表明，气候是影响物种生态位的最重要因素，并在区域基础上掩盖了当地重要的生态梯度，如地表水化学和相对于地下水位的高度。澳大利亚泥炭藓（Sphagnumaustinii）、S. papillosum、S. rubellum和S. tenellum受气候限制于海洋区域。在非泥炭藓物种，上层覆盖，pH值，电导率和高度梯度更广泛的分区比干旱指数梯度。广泛分布的沼泽和贫沼泽物种之间的生态位转移，以及物种沿高度梯度的沿着堆积，表明了一个竞争等级：1）泥炭藓物种比大多数非泥炭藓物种更好的竞争者; 2）草坪和地毯物种比丘物种更好的竞争者; 3）海洋物种比广泛分布的物种更好的竞争者。
The bryophyte component of mire vegetation was analysed on 27 peatlands located on a transect from the Queen Charlotte Islands, British Columbia to central Alberta. The habitats studied range from hyperoceanic bogs and poor fens to subcontinental moderate-rich fens. Habitat niche dimensions are calculated for 11 Sphagnum and 6 non-Sphagnum species alongfive climatic gradients and such ecological variables as surface water chemistry, height relative to the water table, and overstory cover. Species niche overlaps were calculated along Jive gradients: aridity index, corrected conductivity andpH of mire surface waters, height, and overstory cover. Habitat partitioning by Sphagnum species indicates that climate is the most important factor affecting species niches and overshadows on a regional basis such locally important ecological gradients as surface water chemistry and height relative to the water table. Niches of Sphagnum austinii, S. papillosum, S. rubellum, and S. tenellum are restricted to oceanic areas by the climate. Among non-Sphagnum species, the overstory cover, pH, conductivity, and height gradients are more extensively partitioned than the aridity index gradient. Niche shifts among widespread bog and poorfen species, and species packing along the height gradients, suggest a competitive hierarchy where: 1) Sphagnum species are better competitors than most non-Sphagnum species; 2) lawn and carpet species are better com- petitors than hummock species; and 3) oceanic species are better competitors than widespread species.